Updated on 2024/06/21

写真a

 
TAKEMOTO Yoshito
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • Master of Engineering ( Okayama University )

  • Doctor of Engineering

Research Interests

  • 機械材料,機能材料,生体材料

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Structural materials and functional materials

Education

  • Okayama University   工学研究科   生産機械工学

    1986.4 - 1988.3

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    Country: Japan

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  • Okayama University   工学部   生産機械工学科

    1982.4 - 1986.3

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    Country: Japan

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Professional Memberships

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Committee Memberships

  • 軽金属学会中国四国支部   支部役員  

    2021.4   

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  • 軽金属学会中国四国支部   支部役員  

    2021.4 - 2022.3   

  • 日本金属学会中国四国支部   企画担当幹事  

    2021.3   

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  • 日本金属学会   理事  

    2020.3 - 2021.2   

  • 日本金属学会中国四国支部   専任幹事  

    2019.3 - 2021.2   

  • 日本金属学会   理事  

    2016.2 - 2019.2   

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Papers

  • Microstructure and Shape Evolution in Ti-10V-2Fe-3Al Alloy by Tempering Invited Reviewed

    TITANIUM JAPAN   71 ( 3 )   204 - 207   2023.7

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Study on joint characteristics in laser butt welding of AMed and wrought Ti6Al4V plates

    Yasuhiro Okamoto, Togo Shinonaga, Yoshito Takemoto, Akira Okada, Akihiro Ochi, Ryuya Kishimoto, Sisa Pityana, Nana Arthur, Peter Omoniyi, Rasheedat Mahamood, Martin Maina, Esther Akinlabi

    Welding in the World   2023.6

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Titanium alloy Ti6Al4V has been widely applied to medical, automotive, and aerospace industries due to its excellent properties such as high strength and excellent corrosion resistance. On the other hand, additive manufacturing (AM) technology can give the freedom of design of the products. In order to spread the AMed products, the joining of AMed and wrought products are required, and it is important to understand the joint characteristics. In this study, butt welding of Ti6Al4V plate was conducted by fiber laser in argon shielding, and the joint characteristics of laser weld wrought/wrought, AMed/AMed, and AMed/wrought Ti6Al4V plates were experimentally investigated. The AMed plate has higher tensile strength than wrought plate but the elongation of AMed plate is smaller, since AMed plate has α’ martensite due to rapid cooling during laser irradiation in AM process. Then, the laser weld joint of AMed/AMed plates has higher tensile strength, but smaller elongation than that of wrought/wrought plates. The weld joint of AMed/wrought plates shows good welding state, since small heat input leads to formation of small weld bead with higher hardness between wrought and AMed plates.

    DOI: 10.1007/s40194-023-01533-3

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    Other Link: https://link.springer.com/article/10.1007/s40194-023-01533-3/fulltext.html

  • Self-organized vertical multilayer structures in spinodally decomposed TiO2-VO2 films on glass substrates Reviewed

    Yuji Muraoka, Kazutada Takeda, Yoshito Takemoto, Takanori Wakita, Takayoshi Yokoya

    Thin Solid Films   769   139749 - 139749   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.tsf.2023.139749

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  • Structural Changes due to Heating and Stress Loading of Metastable Quenched Martensite Structures in Ti–(10–20) mass% Nb Alloys Reviewed

    Yoshikazu Mantani, Yoshito Takemoto

    MATERIALS TRANSACTIONS   64 ( 1 )   78 - 85   2023.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2320/matertrans.MT-MLA2022014

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  • Alloy Composition Dependency of Uniaxial and Biaxial Compressive Behavior of Metastable β-Type Titanium 10-18 mass% Molybdenum Alloys

    Ichiro SHIMIZU and Yoshito TAKEMOTO

    Advanced Experimental Mechanics   7   65 - 70   2022.8

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  • Formation Mechanism of Tempering-Induced Martensite in Ti–10Mo–7Al Alloy

    Yoshito Takemoto, Mikiko Yasuno, Masaki Ikemoto, Hiroyuki Ando, Ichiro Shimizu

    MATERIALS TRANSACTIONS   63 ( 4 )   489 - 496   2022.4

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Japan Institute of Metals  

    DOI: 10.2320/matertrans.mt-m2021214

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  • Strain relaxation and spinodal decomposition in composition adjusted TiO2-VO2 films on TiO2(100) substrates Reviewed

    Takahiro Fukuda, Yoshito Takemoto, Takanori Wakita, Takayoshi Yokoya, Yuji Muraoka

    Thin Solid Films   751   139210   2022.4

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    DOI: 10.1016/j.tsf.2022.139210

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  • Effects of Thermomechanical Processing on Hydrogen Embrittlement Properties of UltraHigh-Strength TRIP-Aided Bainitic Ferrite Steels

    Tomohiko Hojo, Yutao Zhou, Junya Kobayashi, Koh-ichi Sugimoto, Yoshito Takemoto, Akihiko Nagasaka, Motomichi Koyama, Saya Ajito, Eiji Akiyama

    Metals   12 ( 2 )   269 - 269   2022.1

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The effects of thermomechanical processing on the microstructure and hydrogen embrittlement properties of ultrahigh-strength, low-alloy, transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steels were investigated to apply to automobile forging parts such as engine and drivetrain parts. The hydrogen embrittlement properties were evaluated by conducting conventional tensile tests after hydrogen charging and constant load four-point bending tests with hydrogen charging. The 0.4 mass%C-TBF steel achieved refinement of the microstructure, improved retained austenite characteristics, and strengthening, owing to thermomechanical processing. This might be attributed to dynamic and static recrystallizations during thermomechanical processing in TBF steels. Moreover, the hydrogen embrittlement resistances were improved by the thermomechanical processing in TBF steels. This might be caused by the refinement of the microstructure, an increase in the stability of the retained austenite, and low hydrogen absorption of the thermomechanically processed TBF steels.

    DOI: 10.3390/met12020269

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  • Ti–10Mo–7Al合金の焼戻し誘起マルテンサイトの形成機構 Reviewed

    竹元嘉利, 安野実希子, 池本雅基, 安藤寛幸, 清水一郎

    日本金属学会誌   85 ( 11 )   405 - 412   2021.11

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  • Extremely Rapid Age Hardening in Ti-5Al-2Fe-3Mo Solution Treated at High α + β Temperature Region

    Tomonori Kunieda, Yusuke Kohigashi, Hideki Fujii, Kazuhiro Takahashi, Yoshito Takemoto

    Metallurgical and Materials Transactions A   52 ( 10 )   4424 - 4437   2021.10

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s11661-021-06395-2

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    Other Link: https://link.springer.com/article/10.1007/s11661-021-06395-2/fulltext.html

  • Effects of Matrix Structure and Nitrogen Content on Fatigue Properties of Ultrahigh-Strength Low Alloy TRIP-Aided Steels

    Tomohiko Hojo, Junya Kobayashi, Koh-ichi Sugimoto, Yoshito Takemoto, Akihiko Nagasaka, Motomichi Koyama, Eiji Akiyama

    Tetsu-to-Hagane   107 ( 8 )   672 - 680   2021.8

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    Publishing type:Research paper (scientific journal)   Publisher:Iron and Steel Institute of Japan  

    DOI: 10.2355/tetsutohagane.tetsu-2021-015

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  • Effects of Matrix Structure and Nitrogen Content on Fatigue Properties of Ultrahigh-Strength Low Alloy TRIP-Aided Steels Reviewed

    Tomohiko Hojo, Junya Kobayashi, Koh-ichi Sugimoto, Yoshito Takemoto, Akihiko Nagasaka, Motomichi Koyama, Eiji Akiyama

    ISIJ International   61 ( 2 )   591 - 598   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Iron and Steel Institute of Japan  

    DOI: 10.2355/isijinternational.ISIJINT-2020-392

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  • Decarburizing behavior and its effect on mechanical properties of ultrahigh strength steel sheets

    Kuwata Kentaro, Takemoto Yoshito, Okayasu Mitsuhiro, Bian Jian, Senuma Takehide

    ISIJ International   61 ( 4 )   1300 - 1308   2021

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    In this study, the decarburization behavior, and its effect on mechanical properties of 2 000 MPa class martensitic steel were investigated with the purpose of collecting the basic data to realize the further strengthening of structural members for automobiles. Concerning the decarburization behavior, the maximum of the decarburization rate of 2 000 MPa class martensitic steel with a basic chemical composition of 0.35%C-1.2%Mn was found around 750°C and the thickness of the decarburized zone grew proportional to the square root of time. The addition of Nb reduced the decarburization rate. Concerning the effect of decarburization on mechanical properties, the decarburization significantly improved bendability even though the thickness of the decarburized layer is relatively thin. An observation of the crack behavior revealed that the initiation and propagation of the crack were suppressed by the decarburization layer. The resistance to delayed fracture was improved by decarburization. This improvement is presumed to be based on a similar mechanism for the improvement of bendability.

    DOI: 10.2355/isijinternational.ISIJINT-2020-416

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  • Strain effects on spinodal decomposition in TiO2–VO2films on TiO2(100) substrates Reviewed

    Yuji Muraoka, Fumiya Yoshii, Takahiro Fukuda, Yuji Manabe, Mikiko Yasuno, Yoshito Takemoto, Kensei Terashima, Takanori Wakita, Takayoshi Yokoya

    Thin Solid Films   698   137854 - 137854   2020.3

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.tsf.2020.137854

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  • Control of Heterogeneous Microstructure for Improving Delayed Fracture Resistance of Ultrahigh Strength Hot Stamping Steel Sheets Reviewed

    Takehide Senuma, Yoshito Takemoto, Tomohiko Hojo

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   105 ( 2 )   51 - 59   2019.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Toward a high demand for ultrahigh strength automotive components for reducing body weight and increasing crashworthiness, hot stamped components have been employed worldwidely, and the further increase in strength of hot stamped components is being requested. A large obstacle of the strength increase is the concern about the occurrence of delayed fracture.In this study, we investigated the effects of microstructure on the resistance to delayed fracture of hot stamped steel sheets from a viewpoint of the control of heterogeneous microstructure, and the following results were obtained:(1) The grain refinement of martensite increases the resistance to delayed fracture.(2) Samples containing some amount of ferrite in the martensite matrix have a lower or higher resistance to delay fracture than samples with full martensitic microstructure, depending on the morphology of ferrite.(3) The presence of residual austenite of several % increases the resistance to delayed fracture remarkably but if it is strained and transformed to martensite, the resistance to delayed fracture drastically decreases.(4) Concerning 2000 MPa class hot stamping steel sheets, a higher carbon steel quenched and tempered at low temperature has higher resistance to delayed fracture than a quenched lower carbon steel with the same strength.In the paper, we discussed these results including their mechanisms in detail.

    DOI: 10.2355/tetsutohagane.TETSU-2018-079

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  • Strange phase transformation of Ti-10Mo-7Al alloy Invited Reviewed

    Titanium Japan   67 ( 2 )   112 - 115   2019.2

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  • Martensitic Transformation Induced in Ti-15V-7Al Alloy at Low and High Temperatures Reviewed

    Y. Takemoto, M. Tsunekawa, Y. Manabe, S. Itano and Y. Muraoka

    Materials Transactions   59 ( 10 )   1560 - 1566   2018.10

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    DOI: 10.2320/matertrans.M2018185

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  • Multilayer formation via spinodal decomposition in TiO2-VO2 epitaxial films on sapphire substrates Reviewed

    Y. Matsuura, F. Yoshii, T. Otsuka, K. Kadowaki, M. Ijiri, Y. Takemoto, K. Terashima, T. Wakita, T. Yokoya and Y. Muraoka

    Journal of the European Ceramic Society   38   5043 - 5050   2018.8

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  • Change of Electrical Resistivity with Martensite Transformation of Ti-42mass%Nb Alloy Reviewed

    J. Japan Inst. Met. Mater.   82 ( 7 )   256 - 261   2018.7

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    DOI: 10.2320/jinstmet.J2018013

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  • Martensitic Transformation Induced at Low and High Temperatures on Ti-15V-7Al Alloy Reviewed

    J. Japan Inst. Met. Mater.   82 ( 8 )   307 - 313   2018

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    DOI: 10.2320/jinstmet.J2018014

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  • Effect of aliovalent dopants on the kinetics of spinodal decomposition in rutile-type TiO2-VO2 Reviewed

    Makoto Ogata,Kenji Kadowaki,Masataka Ijiri,Yoshito Takemoto*,Kensei Terashima*,Takanori Wakita*,Takayoshi Yokoya*,Yuji Muraoka*

    Journal of the European Ceramic Society, International Journal of High Technology Ceramics   37 ( 9 )   3177 - 3183   2017.8

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    DOI: 10.1016/j.jeurceramsoc.2017.03.039

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  • Stress-Strain Behavior of Ti-Nb Alloys under Compressions along Linear Strain Paths and Bilinear Plane Strain Path Reviewed

    SHIMIZU Ichiro, TAKEMOTO Yoshito, ISHIKAWA Shinichi, KUMURA Tomohiro

    Advanced Experimental Mechanics   2   99 - 104   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japanese Society for Experimental Mechanics  

    <p>Titanium alloys containing beta stabilizing elements exhibit several superior properties compared to other conventional metals. However, there are unknowns about the mechanical behavior of titanium alloys under biaxial compressive stress conditions. In this study, uniaxial compression and biaxial compressions along linear strain paths and bilinear strain path were performed on titanium-niobium alloys (Ti-Nb alloys) in order to investigate the influence of Nb contents on the compressive deformation behaviors. The results of compressions along linear strain paths revealed that the flow stress decreased while the ductility increased with the increase of the Nb content. It was found that the phenomenon was mainly due to changes of the microstructure and the primary plastic deformation mechanism. Those changes also induce anisotropic hardening. Based on those results, quantitative expression of the stress-strain relation with taking into account the Nb contents was discussed. The investigation on the effect of strain path change on the flow stress revealed the niobium dependency of the stress-strain response before and after the abrupt strain path change.</p><p></p>

    DOI: 10.11395/aem.2.0_99

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  • Influence of Nb Content of Ti-xNb-7Al Alloys on beta -&gt;alpha '' Transformation with Tempering Reviewed

    Masataka Ijiri, Yuki Tomita, Takafumi Ishikawa, Kenji Kadowaki, Yoshito Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   81 ( 7 )   345 - 351   2017

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    The purpose of this study is to investigate the influence of Nb content of Ti-xNb-7Al alloys (x= 20-35 mass%, abbreviated as xNbA) on beta (bcc) -&gt; alpha ''(orthorhombic) transformation with tempering through microstructure, isothermal age-hardening, and shape change of a U-shaped specimen with heating. Full alpha ''-martensite structure was obtained on the quenched 20 NbA. With increasing of Nb content, residual beta-phase increased, and single beta-phase was obtained in the alloys of more than 25 NbA. From the result, the M-S temperature commonly decreases with increasing of Nb content. The hardness of 20 NbA and 23 NbA rapidly increased in a few seconds by isothermal aging at 450 degrees C, and the hardness of the alloys of more than 25 NbA abruptly increased after an incubation period for 30-60 s. No compositional distribution between alpha '' and matrix in the aged 23 NbA was found by STEM-EDS analysis, but the obvious distribution of Nb was detected in 35 NbA. U-shaped specimen of 20 NbA exhibited no shape change by heating. On the other hand, the specimen of 23 NbA composed of beta+alpha '' phases showed the shape recovery (SR) first due to work induced alpha ''-&gt;beta inverse transformation, then deformed toward the bending direction (SA: shape advance) due to beta -&gt;alpha '' transformation. The specimens of more than 28 NbA composed of single beta-phase exhibited only SA without SR. The starting temperature of SA (M-SA: beta -&gt;alpha '') with heating increases with increasing of Nb content. Merging M-S(upper) and M-SA(lower), it is proposed that the whole M-S of xNbA alloy forms a bow shape curve. It is suggested that the low Nb alloys inside the M-S curve transform immediately without atom diffusion by tempering at 450 degrees C, but the higher Nb alloys outside the curve need an incubation period to distribute Nb concentration with atom diffusion, and martensitic alpha '' transformation will abruptly occur in the local domains less than 25 NbA which is the inside of the curve.

    DOI: 10.2320/jinstmet.J2017011

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  • Stress-Strain Behavior of Ti-Nb Alloys under Compressions along Linear Strain Paths and Bilinear Plane Strain Path Reviewed

    SHIMIZU Ichiro, TAKEMOTO Yoshito, ISHIKAWA Shinichi, KUMURA Tomohiro

    Advanced Experimental Mechanics   2   1 - 6   2016.11

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Japanese Society for Experimental Mechanics  

    <p>Titanium alloys containing beta stabilizing elements exhibit several superior properties compared to other conventional metals. However, there are unknowns about the mechanical behavior of titanium alloys under biaxial compressive stress conditions. In this study, uniaxial compression and biaxial compressions along linear strain paths and bilinear strain path were performed on titanium-niobium alloys (Ti-Nb alloys) in order to investigate the influence of Nb contents on the compressive deformation behaviors. The results of compressions along linear strain paths revealed that the flow stress decreased while the ductility increased with the increase of the Nb content. It was found that the phenomenon was mainly due to changes of the microstructure and the primary plastic deformation mechanism. Those changes also induce anisotropic hardening. Based on those results, quantitative expression of the stress-strain relation with taking into account the Nb contents was discussed. The investigation on the effect of strain path change on the flow stress revealed the niobium dependency of the stress-strain response before and after the abrupt strain path change.</p><p></p>

    DOI: 10.11395/aem.2.0_99

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  • Effect of Nb in Ti-xNb-7Al Alloys on Microstructure and Tempering Behavior Reviewed

    Masataka Ijiri, Yuki Tomita, Takafumi Ishikawa, Yousuke Taguchi and Yoshito Takemoto

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)   648 - 650   2016.8

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  • Effect of Stress Loading on Elastic Behavior of Quenched Ti-Nb Alloys Reviewed

    Yoshikazu Mantani and Yoshito Takemoto

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)   644 - 647   2016.8

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  • Shape Change Behavior and Microstructure with Tempering of Ti-10Mo-7Al Alloy Reviewed

    Yoshito Takemoto, Masataka Ijiri and Tatsuya Tanaka

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)   651 - 653   2016.8

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  • Oil-in-water emulsion as fabrication platform for uniform plasmon-controlled two-dimensional metallic nanoparticle array Reviewed

    Ryusuke Kagawa, Nobuyuki Takeyasu, Takashi Kaneta, Yoshito Takemoto

    APPLIED PHYSICS EXPRESS   9 ( 7 )   075003   2016.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Gold/silver nanoparticles were trapped at the oil/water interface of oil droplets dispersed in water. The metallic nanoparticles were self-assembled into a uniform two-dimensional large array structure through the aggregation and coalescence of the nanoparticle-covered oil droplets. The plasmon resonance of the array structure was tunable and a surface-enhanced Raman scattering measurement was performed with the silver nanoparticle array. The enhancement factor was similar to 10(5) and enhanced Raman signals were observed over the whole array (greater than or similar to cm(2)) with high reproducibility, which is an advantage of a self-assembly method using a liquid/liquid interface. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.9.075003

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  • Phase Transformation Behavior of Ti-35Nb-7Al Alloy with Tempering Reviewed

    Masataka Ijiri, Yuki Tomita, Takafumi Ishikawa, Yoshito Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   80 ( 9 )   547 - 552   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    Certain beta-Ti alloys, Ti-4Fe-7Al and Ti-10Mo-7Al, the compositions of which are characterized by a 7% aluminum addition to the beta lower. limit compositions, exhibit an interesting phenomenon upon tempering. For example, these alloys drastically harden upon tempering at 450 degrees C for several seconds, and the sample surface becomes severely uneven. When a strip specimen is bent plastically or elastically into a U-shape and heated to 450 degrees C, the shape spontaneously deforms towards the inside, which is different from the behavior of shape-memory alloys. In this study, Ti-35Nb-7Al alloy was selected as a candidate novel alloy, and the microstructure, the characteristics of age hardening and the shape evolution of a U-shaped specimen upon heating were investigated. The quenched alloy was a single beta-phase, and its hardness was considerably higher than that of binary Ti-35Nb alloy. The smooth surface of the quenched specimen became uneven at around 300 degrees C upon heating. Either case of U-shaped specimen, which was plastically or elastically bent, exhibited spontaneous bending towards the inside by heating up. It was found that, with tempering, Ti-35Nb-7Al also exhibits the novel phenomenon, similarly to Ti-4Fe-7Al and Ti-10Mo-7Al. Fine needle-alpha '' and omega-particles were formed in the beta matrix after isothermal aging at 450 degrees C for 3 min and gave rise to a remarkable hardening. STEM. EDS analysis revealed that the Nb content decreased in the alpha '' products formed by tempering. Consequently, the beta -&gt;alpha '' transformation upon tempering on this alloy is accompanied with atomic diffusion. Extra spots at &lt; 100 &gt;*, such as those of the B2 structure, were observed in the selected. area diffraction patterns of the TEM foils prepared by common electropolishing techniques. However, a TEM foil prepared with an FIB ( focused ion beam) did not exhibit the extra spots. These results suggested that the extra spots were caused by hydrogen absorption in the specimen during electropolishing.

    DOI: 10.2320/jinstmet.JAW201601

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  • Microstructure of Ti-4Fe-7Al Alloy Quenched in a Salt Bath after Solution Treatment Reviewed

    Masataka Ijiri, Akira Okumura, Takafumi Ishikawa, Kenji Kadowaki, Yoshito Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   80 ( 11 )   691 - 696   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    The Ti-4Fe-7Al alloy exhibits some interesting phenomena upon tempering. The noteworthy features are rapid hardening and shape change in a U-shaped specimen with heating, which are caused by the beta(bcc) -&gt; alpha '' (orthorhombic) transformation at elevated temperature. The transformation behavior on the TTT ( time-temperature-transformation) diagram estimated from the age hardening at various temperatures indicated a C-curve with a nose at 450 degrees C, which means that the transformation occurs through a thermal activation process. However, STEM-EDS analysis of alpha '' revealed that the transformation had occurred without atom diffusion. In this study, every solution treatment was carried out at 1050 degrees C for 30 min under a vacuum, then the specimen was quenched into a salt bath of 200-550 degrees C and held for a certain period prior to water quenching. These treated specimens were compared with the quenched and tempered specimens with respect to the microstructure and the hardening behavior. The hardness of the specimens held at 200-500 degrees C (30 s) increased with increasing holding temperature. The maximum hardness, 610Hv, which was almost the same as that of a tempered specimen, was obtained at around 450 degrees C. The microstructure of the specimen held at 450 degrees C (30 s) showed a common morphology composed of acicular martensite variants, except for the size. Because the several variants would cancel the transformation strain of each other, no severe unevenness of the surface was generated, unlike the tempered specimen. On the other hand, the hardness of the specimen held at 550 degrees C (30 s) decreased drastically owing to the phase separation to alpha + beta, and the TiFe precipitates were generated from beta upon the extension of the holding time.
    By the TEM observation of the electropolished thin foil of the specimen held at 450 degrees C (30 s), unreasonable microstructure that was different from the XRD result was obtained. Just after the electropolishing, the SAD patterns showed that the alpha '' structure has a commensurate relation with the beta-lattice. However, alpha '' turned spontaneously into an incommensurate relation after one year. On the other hand, TEM observations of the foil prepared by FIB (focused ion beam) were consistent with the XRD result. It was suggested that the hydrogen absorption during electropolishing caused a structural transition of alpha '' martensite.

    DOI: 10.2320/jinstmet.J2016032

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  • Change in structure and mechanical properties of Ti-10Mo-7Al by heat treatments Reviewed

    M. Ijiri, Y.Takemoto

    Proc. and Fabrication of Advanced Materials -XXIV   318 - 324   2015.12

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  • Change in Crystal Structure and Material Properties with Deformation of Quenched Martensite in Ti-Nb Alloys Reviewed

    Yoshikazu Mantani, Yoshito Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   79 ( 9 )   461 - 467   2015.9

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    Language:Russian   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    The purpose of this study was to investigate and discuss the relationship between the crystal structure of martensites and the material properties, such as the Young's modulus and internal friction, in quenched Ti-Nb alloys with plasto-elastic deformation. In the alloys, minimal Young's modulus was indicated by the alpha' martensite of Ti15Nb, and maximal internal friction was indicated by the alpha '' martensite of Ti18Nb. After a weak plastic deformation of 5% rolling reduction, the Young's modulus of Ti-(15, 18, 20)Nb decreased, and the internal friction of Ti20Nb increased though that of Ti-(15, 18)Nb hardly changed. From the XRD profiles, the extreme values of the material properties were predicted to be associated with the unit volume and phases (hexagonal close-packed or orthorhombic) of the materials. It was also predicted to be associated with the change of phase from alpha' to alpha '' and from alpha '' to alpha' + alpha '' or alpha '' + alpha '' with different lattice parameters. Cyclic tensile test results after weak plastic deformation revealed characteristic changes in elastic incline, that is, an increase from similar to 40 GPa in Ti15Nb, and a decrease until similar to 40 GPa from the initial value followed by an increase in Ti18Nb and Ti20Nb. The consequent changing mechanism of material properties was suggested from the viewpoint of the changing behavior of the phase transformation and transition on martensites with plastic deformation or loaded elastic deformation.

    DOI: 10.2320/jinstmet.JAW201506

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  • Phase Transformation Behavior of Ti-10Mo-7Al Alloy with Heat Treatment Reviewed

    Masataka Ijiri, Yoshito Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   79 ( 9 )   468 - 473   2015.9

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    A novel phenomenon recently observed in the tempering of Ti-4Fe-7Al alloy, has attracted considerable attention. This phenomenon is induced by the beta -&gt;alpha '' transformation during tempering, and its noteworthy features are rapid hardening and a shape change in a U-shaped specimen. It is of interest whether this phenomenon occurs in other alloy systems. In this study, Ti-10Mo-7Al alloy, which contains a quantity of molybdenum corresponding to the lower beta limit, was prepared and its microstructure, aging behavior, and shape change during tempering were investigated. An acicular alpha '' martensites were observed preferentially at the beta grain boundaries in the quenched specimen, but it became invisible at the optical microscope level upon tempering. However, TEM (transmission electron microscopy) observation of the tempered specimen revealed nano size martensites instead of micron-size martensites. The novel phenomenon observed in the tempering of Ti-4Fe-7Al, was also confirmed to occur in Ti-10Mo-7Al alloy. In the heating of a U-shaped specimen, shape recovery occured first, then a shape return into a U-shape followed, and a curvature progressed more with increasing of temperature. As a result, the phenomenon was clarified to be a universal one. The transformation mechanism through tempering is explained as follows: Though aluminum addition to beta-alloy raises the M-S chemically, on the other hand, it causes a remarkable solution strengthening, which increases shear stress required for martensite transformation, and decreases the apparent M-S. Consequently, the beta phase is maintained by a rapid cooling. However, temperature rise decreases the shear stress, and the apparent M-S increases to a chemically intrinsic one. If the M-S increases beyond the tempering temperature, martensite transformation occurs abruptly.

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  • Alloy Composition Dependency of Plastic Deformation Behavior in Biaxial Compressions of Ti-Nb Alloys Reviewed

    Ichiro Shimizu, Kazuki Hisada, Shinichi Ishikawa, Yoshito Takemoto, Naoya Tada

    INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS 2014   9302   2015

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    Crystal structure of titanium alloy changes from alpha (hexagonal close-packed) to beta (body centered cubic) with increase of beta stabilizer content. This change of structure strongly influences on the plastic deformation behavior of titanium alloys, because it not only induces changes of slip systems but also activates martensitic transformation and deformation twinning. However, most of past studies on titanium alloys have been focused on the development of specific functionalities induced by alloy designing, and few research works have been reported on metal workability under multi-axial stress conditions, which is key factor to apply titanium alloys for engineering products. In this study, uniaxial and biaxial compression tests of titanium-niobium alloys with various niobium contents have been performed to clarify the influence of beta stabilizer content on the plastic behavior under compressive stress conditions. The titaniumniobium alloys were solution treated and then quenched from beta region to obtain metastable structures. The resultant stress-strain relations together with microscopic observations of texture revealed that the influence of niobium contents on the predominant plastic deformation mechanisms and thus on the hardening phenomena. The equi-plastic work contours obtained by uniaxial and biaxial compression tests also implied the crystal structure dependency of anisotropic hardening, which was evaluated quantitatively by means of Hill's anisotropic yield criterion. The results will provide information on the versatile constitutive relations of titanium alloys containing beta stabilizer elements, that is important to prove the performance of products manufactured by compressive metal working processes such as forging and extrusion.

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  • Influence of Microstructures on Hydrogen Embrittlement Susceptibility of Hot Stamped Ultrahigh Strength Components Reviewed

    Masahiro Matsumoto, Yoshito Takemoto, Takehide Senuma

    HOT SHEET METAL FORMING OF HIGH-PERFORMANCE STEEL CHS2 (5TH INTERNATIONAL CONFERENCE)   ( 5 )   55 - 63   2015

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    One of large hindrances against the increase in the strength of hot stamped components is an increasing risk of the occurrence of delayed fracture. In this study, the influence of microstructures on the hydrogen embrittlement susceptibility of hot stamped ultra-high strength components has been investigated. The following results were obtained.
    The grain refinement of martensite reduces the hydrogen embrittlement susceptibility. The bake hardening (BH) treatment through which the lattice stress is released and fine ferrous carbides are precipitated suppresses the delayed fracture significantly. A presence of small amount of ferrite in the martensite microstructure hardly decreases the resistance to delayed fracture. A proper presence of nano-scale precipitates delays the occurrence of the delayed fracture. The precipitation control which creates the proper precipitates trapping hydrogen effectively and suppressing the delayed fracture will be discussed in the paper.
    The obtained results indicated that hot stamped components with a tensile strength of more than 2000 MPa without great risk against the delayed fracture can be produced by a sophisticated microstructural control.

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  • Influence of Predeformation on Tempering Structure of Ti-5Al-2Fe-3 Mo Alloy Reviewed

    Yoshito Takemoto, Keita Wada, Kenta Asakura, Takehide Senuma, Tomonori Kunieda, Hideki Fujii

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   78 ( 12 )   434 - 440   2014.12

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    A near-beta-type Ti-5Al-2Fe-3Mo alloy (Super-TIX (R) 523AFM) was developed as a low-cost and high-strength material for automotive components such as intake valves. Its mechanical properties, such as strength, elongation and Young's modulus, are adjustable via the solution treatment temperature. Furthermore, a unique phenomenon different from the shape memory effect that appears after tempering has recently been discovered in the alloy. In this study, the influence of predeformation on the microstructural evolution attributed to the tempering of the alloy quenched from 900 degrees C (alpha + beta) was investigated to clarify the cause of the unique phenomenon. Although the phase constitution of the quenched specimen was alpha + beta, the effective Mo equivalency (6.5Mo(effeq)) of the phase was lower than the minimum beta composition (10Mo(effeq)) in common beta alloys. Work. induced alpha" martensite plates consisting of single alpha" variant including nanosize beta domains were formed in the beta-phase by cold-rolling. Upon heating the rolled specimen to around 250 degrees C, the plates vanished owing to the alpha"-&gt;beta inverse transformation and the hardness decreased. However, when the rolled specimen was heated to 450 degrees C, the hardness markedly increased as a result of the beta -&gt;alpha" transformation, and the plates were formed again. The plates consist of a single alpha" variant, but the alpha" lattice is not extensively continuous and is divided into nanosize domains by boundaries containing many faults. It is considered that the evolution of single-alpha"-variant plates generates a large distortion due to the transformation strain and leads to the unique shape change. Such plates were not formed in undeformed specimen by aging at 450 degrees C, and the beta-phase was transformed into a nanosize domain structure composed of multiple alpha" variants. Consequently, these fine structure in the undeformed specimen led to its higher hardness than that of the rolled specimen.

    DOI: 10.2320/jinstmet.J2014035

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  • ホットスタンピングの成形性ならびに生産性向上技術 Reviewed

    瀬沼武秀,竹元嘉利

    鉄と鋼   100 ( 12 )   1481 - 1489   2014.12

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  • V単独,V-Nb複合添加超高強度ホットスタンピング部材の組織と機械的性質 Reviewed

    立山 祥大, 石尾 遼平, 林 公平, 須江 龍裕, 竹元 嘉利, 瀬沼 武秀

    鉄と鋼   100 ( 9 )   1114 - 1122   2014.9

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  • Formability and Productivity Improving Technology of Hot Stamping Reviewed

    Takehide Senuma, Yoshito Takemoto

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   100 ( 12 )   1481 - 1489   2014

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    As a method for producing ultrahigh strength automotive steel components with high gauge accuracy the hot stamping technology draws attention and is practiced widely today. For supporting and developing this technology, numerous researches have been actively carried out all over the world. It is a good timing to review this technology on this special issue because further rapid development is to be expected in the next decade. The hot stamping technology consists of a variety of techniques. In this review, the authors focus two items suitable to this special issue, the first one is the formability of hot stamping and the second is the technology for improving its productivity.
    The review shows the importance of the temperature control at stamping parts to achieve excellent formability. Through the review on the technology for improving the productivity of hot stamping, the authors propose highly productive hot stamping processes consisting of rapid heating, short time stamping and rapid cooling.

    DOI: 10.2355/tetsutohagane.100.1481

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  • Microstructures and Mechanical Properties of V and/or Nb Bearing Ultrahigh Strength Hot Stamped Steel Components Reviewed

    Shota Tateyama, Ryohei Ishio, Kouhei Hayashi, Tatsuhiro Sue, Yoshito Takemoto, Takehide Senuma

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   100 ( 9 )   1114 - 1122   2014

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    As a method for producing ultrahigh strength automotive steel components with high gauge accuracy, the hot stamping technology draws attention and the amount of hot stamped automotive components has exponentially increased in the last decade. The concerns about the potential danger of embrittlement and delayed fracture, however, limit the strength of conventional hot stamped components to 1500 MPa. If these concerns are eliminated, automotive steel components with higher strength which is demanded by the automotive industry can be further commercialized.
    In this study, microstructures and mechanical properties of V and/or Nb bearing ultrahigh strength hot stamped steel components have been investigated. The V addition improves the resistance to delayed fracture by forming VC whose interface with matrix is supposed to act as preferential hydrogen trap site. The Nb addition refines the microstructure, which improves both the toughness and the resistance to delayed fracture. Proper hot stamping conditions for these steels has been discussed to create an ultrafine martensite microstructure and finely dispersed precipitates. The results indicate that 1900 MPa class steel components with good toughness and high resistance to delayed fracture can be produced.

    DOI: 10.2355/tetsutohagane.100.1114

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  • V,Cuの単独ならびに複合添加中炭素鋼の析出硬化挙動 Reviewed

    鉄と鋼   99 ( 11 )   669 - 675   2013.11

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  • Influence of Various Factors on the Refinement of Martensitic Microstructures of Hot Stamped Steel Components Reviewed

    Ono Takafumi, Hosomi Tsukasa, Takemoto Yoshito, Senuma Takehide

    Tetsu-to-Hagane   99 ( 7 )   475 - 483   2013.7

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    The toughness and the resistance to delayed fracture are deteriorated with increasing strength of martenstic steels. It has been reported that these properties could be improved by grain refinement of martensite.<br>In this study, the influence of both hot stamping conditions such as heating rate, heating temperature, cooling rate, and material conditions such as hot band microstructure, cold rolling reduction, addition of micro-alloys on the grain refinement of hot stamped ultra-high strength martenstic steel components are investigated. The investigation revealed that low temperature and short time heating, high heating and cooling rates, the decrease in the coiling temperature of hot bands, the increase in cold rolling reduction and addition of micro-alloys are preferable for grain refinement of martensite. The mechanism of the grain refinement was discussed from the viewpoints of the increase in the nucleation rate of austenite during the α→γ transformation and the suppression of the austenite grain growth.

    DOI: 10.2355/tetsutohagane.99.475

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  • Hydrogen Embrittlement Properties of Ultra High-Strength Low Alloy TRIP-Aided Steels with Hot Forging Process Reviewed

    Proc. of the 2nd. Int. Sympo. on Automobile Steel   169 - 172   2013.5

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  • ホットスタンピング部材の生産性向上ならびに高機能化のための組織制御 Reviewed

    塑性と加工   54   137 - 142   2013.2

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  • Development of 2000MPa Class Hot Stamped Steel Components with Good Toughness and High Resistance against Delayed Fracture Reviewed

    Akitaka Tokizawa, Kousuke Yamamoto, Yoshito Takemoto, Takehide Senuma

    HOT SHEET METAL FORMING OF HIGH-PERFORMANCE STEEL CHS2 (4TH INTERNATIONAL CONFERENCE)   ( 4 )   473 - 479   2013

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    Although higher strength of hot stamped automotive components is demanded, the strength higher than 2000 MPa is not realized because of the deterioration of toughness and resistance against delayed fracture.
    In this study, we investigated a proper microstructural control to achieve a good strength-toughness balance with high resistance against delayed fracture. As a result, we have determined the condition for producing 2000 MPa class hot stamped components with the toughness and anti-delayed fracture property which are nearly equal to or better than those of conventional 1500 MPa class components. The microstructure of the hot stamped components consists of ultrafine grained martensite matrix with finely dispersed ferrous carbides and alloy precipitates. The grain refinement of martensite implies to improve toughness and the existence of fine ferrous carbides and alloy precipitates indicate to increase the sites trapping hydrogen and to raise the resistance against delayed fracture.

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  • Precipitation Hardening Behavior of V and/or Cu Bearing Middle Carbon Steels Reviewed

    Yuuki Murase, Naoyuki Iwasa, Yoshito Takemoto, Takehide Senuma

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   99 ( 11 )   669 - 675   2013

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    In this study, the precipitation hardening behavior of middle carbon steels with single and multiple additions of 0.3mass%V and 2mass%Cu has been investigated. The precipitation treatment was carried out isothermally at 550 degrees C, 600 degrees C and 650 degrees C.
    In the 0.3mass%V bearing steel, precipitation hardening was observed at 600 degrees C and 650 degrees C while no significant increase in hardness was observed at 550 C. When 2mass% Cu was added to the 0.3mass%V bearing steel, the hardness attributed to the precipitation hardening of Cu was added to that attributed to the precipitation hardening of VC in the cases of 600 degrees C and 650 degrees C. In the case of 550 degrees C, the V addition into the Cu bearing steel markedly increased the hardness although the precipitation hardening of VC was hardly observed in the 0.3mass%V bearing steel. In the paper, the different precipitation hardening behavior of the three steels is discussed in detail in consideration of the observed precipitation behavior.

    DOI: 10.2355/tetsutohagane.99.669

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  • Peculiar Transformation Behavior and Microstructure Evolution with Tempering of Ti-4Fe-7Al Alloy Reviewed

    Yoshito Takemoto, Kazuya Fujii, Shou Nakastuka, Takehide Senuma

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 9 )   368 - 374   2013

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    The transformation behavior and microstructural changes of Ti-4Fe-7Al alloy during tempering were investigated by performing a hardness test and using X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. Within a brief time of 30 s during tempering at 450 degrees C, the hardness rapidly increased to a maximum value of 600 Hv. The transformation behavior estimated from the increase in hardness indicated "a lower half of C-curve" in the TTT diagram, which suggests that the transformation occurs through certain thermal activation processes. However, it is difficult to assume that the transformation is controlled by the diffusion of substitutional atoms, since the mean diffusion distance of Fe atoms during tempering at 300 degrees C for 1 x 10(3) s, which also maximized the hardness, is much less than the distance of the nearest neighbors in the beta structure. The structure of the alpha '' phase formed by tempering depends on both the temperature and holding time; a high temperature and a long time bring the alpha '' phase close to an hcp structure. As determined by XRD measurement, the sample tempered at 150 degrees C for 60 min was composed of the beta phase. However, the omega and alpha '' phases were also detected in selected area diffraction (SAD) patterns. The sample tempered at 450 degrees C for 60 min consisted of a single alpha '' phase and exhibited a tweed structure in the TEM observation. Although the tweed structure seemed to contain only one alpha ''-variant in the SAD patterns, HR-TEM observation revealed that it was composed of multiple nanoscale variants. It was considered that the marked grain refinement due to the nanoscale variants led to the extreme hardening of the sample and the significant broadening of XRD peaks. When the tempering temperature was increased to 600 degrees C, the a phase and finely dispersed TiFe precipitates were formed after 60 min by the diffusion of atoms, which resulted in the softening of the sample and the sharpening of the XRD peaks.

    DOI: 10.2320/jinstmet.J2013027

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  • Microstructural Control in Hot Stamping Processes for Producing Ultra-high Strength Automotive Steel Components Reviewed

    Takehide Senuma, Yoshito Takemoto, Kenichi Shimizu, Tomohiko Hojo

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   98 ( 11 )   751 - 758   2012.11

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  • Unprecedented Phenomena with Tempering of Ti-4Fe-7Al Alloy Reviewed

    Yoshito Takemoto, Masahiro Ochi, Takehide Senuma, Jun Takada, Ichiro Shimizu, Kazuhiro Matsugi

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   76 ( 7 )   449 - 455   2012.7

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    Unprecedented phenomena were discovered by tempering the Ti-4Fe-7Al alloy quenched from the beta (bcc) field. The alloy became very hard when it was tempered at 450 degrees C for several minutes, and severely rugged surface was generated. The inverse shape recovery phenomenon was also discovered when a quenched specimen that had been bent at room temperature was heated. The tempered microstructure showed almost beta grains and some of the usual martensitic acicular structure areas. However, electron back scattering pattern (EBSP) measurements showed that the beta-like grain was not the bcc structure but was the hcp or orthorhombic structure. X-ray diffraction (XRD) measurements clarified that an orthorhombic alpha '' structure (a = 0.299(5) nm, b = 0.491(3) nm, c=0.465(9) nm) was formed from the beta phase by tempering. Moreover, this a '' structure was confirmed to be a type of martensitic transformation because no concentration distribution was detected in scanning transmission electron microscopy-energy dispersive spectroscopy (STEM-EDS) analysis of the microstructure. It was suggested that the essential M-s point of the alloy should be higher than room temperature; however, the martensite transformation could not operate by fast quenching.
    The newly-discovered alpha '' martensite is formed without atomic diffusion by heating. When the beta grain transforms into the single alpha ''-variant, a very huge lattice strain is generated, resulting in the severely rugged surface or the inverse shape recovery phenomenon.

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  • Tensile Properties and Work-hardening Behavior of Fe-3%Al Single Crystal Reviewed

    Yoshito Takemoto, Takehide Senuma

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   98 ( 6 )   216 - 222   2012.6

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    Synopsis: The tensile deformation behavior of single and poly-crystal Fe-3%Al alloys was investigated at room temperature. The work hardening rate (WEIR) of the polycrystalline alloy monotonously decreased with increasing strain and increased with decreasing grain size. The WHR of the single crystal alloy was remarkably lower than that of the polycrystalline alloy, and the single crystal alloy exhibited a peculiar behavior that could be classified into four different types depending on the tensile axes. When the tensile axes were on the line connecting &lt; 102 &gt; and &lt; 101 &gt; in the stereo triangle, the characteristics of deformation of the single crystal alloy were steady and its WHR showed a monotonous decrease similar to that observed in the case of the polycrystalline alloy. For most of the tensile orientations, including &lt; 001 &gt;, the WHR curve changed from concave to convex with a strain increase. The WHR for the &lt; 101 &gt; orientation also showed the maximum and minimum values, i.e., it dropped immediately after reaching the maxima. This behavior was considered ascribable to the transition of the dislocation structure. The deformation for the &lt; 111 &gt; orientation was characterized by the highest yield stress and work softening, which were caused by some intense slip bands with discontinuous stress drops. Lattice rotation with tensile deformation in single crystal alloys was also examined by an electron backscatter diffraction (EBSD) measurement. For determining the rotation direction, the stereo triangle was divided into two areas by a great circle connecting &lt; 113 &gt; and &lt; 102 &gt;.

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  • Influence of Al Addition on Microstructures and Mechanical Properties of Ti-Fe Alloys Reviewed

    Yoshito Takemoto, Masahiro Ochi, Takehide Senuma, Jun Takada, Ichiro Shimizu, Kazuhiro Matsugi

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   76 ( 5 )   332 - 337   2012.5

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    The influence of Al content on the evolution of microstructures and mechanical properties of Ti-xFe-yAl alloys quenched from a beta field was investigated via hardness measurements, tensile tests, scanning electron microscopy (SEM) equipped with electron back scattering pattern (EBSP) analyzer, and conventional transmission electron microscopy (TEM). The hardness of Ti-(3-6)Fe-yAl decreased remarkably on addition of 1% Al. In comparison to binary alloys, the maximum hardness decrease was achieved in Ti-4Fe-1Al. The hardness of Ti-4Fe-yAl decreased with increasing Al content up to around 5%, reaching a minimum, then gradually increased. Though all of the Ti-3Fe-yAl alloys showed the martensite structure, Ti-4Fe-yAl showed a structural change of beta + omega -&gt; beta + omega + martensite -&gt; beta + omega with increasing Al content. Consequently, Ti-4Fe-7Al had the lowest density in the beta-type alloys equivalent to that of Ti-6Al-4V. The ratio of reciprocal distance d(0002 omega)*/d(222 beta)* on selected-area diffraction (SAD) pattern, which is often used as an indicator of {332}&lt; 113 &gt; twin formation, was nearly constant up to 5% Al of Ti-4Fe-yAl, but decreased over 6% Al. The tensile tests of both Ti-4Fe-5Al and Ti-4Fe-7Al showed ductility. The deformation behavior of Ti-4Fe-5Al producing strain-induced martensite resembled that of Ti-8Mo. On the other hand, Ti-4Fe-7Al was deformed by a coarse slip of {112}&lt; 111 &gt; in the same manner as Ti-20Mo, and the SAD pattern analysis revealed that the diffuse reflection of the omega phase in the non-deformed area turned into the spots at the deformation band. It was suggested that Al behaves as a beta stabilizer element when added to the lowest beta alloy and is available for weight saving, while maintaining the beta structure.

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  • Microstructural Evolution of Carbon Steels in Hot Stamping Processes Reviewed

    Kenta Hidaka, Yoshito Takemoto, Takehide Senuma

    ISIJ INTERNATIONAL   52 ( 4 )   688 - 696   2012

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    Hot stamping is a very promising method for producing ultrahigh-strength automotive components. The heating and cooling conditions in the conventional hot stamping process are quite limited. To improve the productivity of the process and/or the mechanical properties of the product, optimizing the heating and cooling conditions is an important and urgent research subject.
    In this study, the influence of the heating rate, heating temperature, and cooling conditions on the microstructure and mechanical properties of 0.22%C-2.5%Mn steel was investigated. Samples were heated at two different heating rates (10 degrees C/s and 200 degrees C/s) to various temperatures and then either cooled in air or quenched using water sprays. The sample heated at 200 degrees C/s to 800 degrees C and then immediately quenched in water exhibited a very fine martensite microstructure haying a grain size with an average diameter of 4 mu m and a hardness value around 550 Hy. The sample heated above Ac3 and subsequently cooled in air exhibited a full martensite microstructure and a hardness of 450 Hy. A model that predicted the precipitation of cementite during cooling was developed to clarify the cause of the difference in hardness of the martensite in the samples that were quenched in water and cooled in air. The calculations showed that the hardness of samples cooled in air was lower mainly because of the decrease in the solid solution hardening of C owing to the precipitation of cementite below the Ms temperature. Drawing on the results obtained, hot stamping technology is discussed and favorable operational conditions proposed.

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  • Influence of Ti and Nb on the Strength-Ductility-Hole Expansion Ratio Balance of Hot-rolled Low-carbon High-strength Steel Sheets Reviewed

    Kyohei Kamibayashi, Yutaka Tanabe, Yoshito Takemoto, Ichirou Shimizu, Takehide Senuma

    ISIJ INTERNATIONAL   52 ( 1 )   151 - 157   2012

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    To satisfy the demand for high-strength steel sheets with excellent strength-ductility-hole expansion ratio balance, high-strength steels consisting of a ferrite or bainitic ferrite matrix strengthened by a large amount of finely dispersed precipitates have been developed.
    In this study, the influence of the precipitation-forming elements Ti and Nb on the strength-ductility-hole expansion ratio balance of these steels has been investigated. The strength-ductility-hole expansion ratio balance of steel with Ti added was superior to that with Nb added. The reason for the superiority of steel with added Ti was discussed from various viewpoints such as microstructure, texture, the condition of the pierced surface, sulphide formation, the nucleation and propagation behaviour of cracks during hole expansion, etc. We concluded that the inferior strength-ductility-hole expansion ratio balance of the steel with added Nb was mainly caused by the formation of large textural colonies and a detrimental influence of MnS. From these inferences, we proposed a combined addition of Ti and Nb, and succeeded in improving the strength-ductility-hole expansion ratio balance of the advanced high-strength steel.

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  • MODEL for PREDICTING RECRYSTALLIZATION BEHAVIOR OF COLD ROLLED EXTRALOW CARBON STEEL SHEETS Reviewed

    Takehide Senuma, Yoshito Takemoto

    THERMEC 2011, PTS 1-4   706-709   2302 - 2307   2012

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    Microstructual observations indicate that the recrystallization of cold rolled extralow carbon steel sheets occurs due to the abnormal growth of selected subgrains in recovered subgrain microstructures.
    The authors measured the orientations of a recovered microstructure of a cold rolled extralow carbon steel sheet by SEM-EBSP and classified the deformed grains into several types due to the orientation and its scattering degree.
    In this study, a model for predicting the recrystallization behavior of cold rolled extralow carbon steels has been developed by applying the model of Humphreys modified to the grain of each type. A good agreement between the experimental and calculated results using the model developed was obtained.

    DOI: 10.4028/www.scientific.net/MSF.706-709.2302

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  • Effect of Rapid Heating on Evolution of Microstructures and Coating Layers in Hot Stamping Processes Reviewed

    Proc. of the 3nd Int.Conf. Hot Sheet Metal Forming of High-Performance Steel   465 - 472   2011.6

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  • Model for Predicting Recrystallization Behavior of Colled Rolled Extralow Carbon Steel Sheets Reviewed

    Norihisa Nishitani, Takafumi Hiramoto, Yoshito Takemoto, Takehide Senuma

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   97 ( 4 )   238 - 244   2011.4

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    Microstructual observations indicate that the recrystallization of cold rolled extralow carbon steel sheets occurs due to the abnormal growth of selected subgrains in recovered subgrain microstructures. Based on this recrystallization mechanism, a new model for predicting the recrystallization behavior of a material with idealized microstructure was proposed by Humphreys. The model cannot, however, predict the recrystallization behavior of cold rolled steel sheets in the practice because of the complexities of their microstructure.
    In this study, a model for predicting the recrystallization behavior of cold rolled extralow carbon steels has been developed based on the model by Humphreys. The feature of the present model is that the pinning and solute drag effects on the recrystallization behavior can be evaluated quantitatively.
    Using the model, the influence of Ti addition on the recrystallization in extralow carbon steel sheets was discussed. The result indicates that the retardation of the recrystallization due to the addition of Ti is attributed mainly to the retardation of the subgrain formation in the recovery process, and the effect of the pinning of precipitates and the dragging of solute Ti atoms on the progress of recystallization are relatively small.

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  • 極低炭素冷延鋼板の再結晶モデル Reviewed

    鉄と鋼   97 ( 4 )   238 - 244   2011.4

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  • Influence of Alloying Elements on Precipitation Behavior of VCN in Middle Carbon Steels Reviewed

    Takehide Senuma, Yoshito Takemoto

    SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2   172-174   408 - +   2011

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    For lightening the hot forged automotive components such as connecting rods, crank shafts etc. the increase in their yield strength is an important technical issue. Recent developments indicate that it is a promising way to increase the yield strength of the components using the ferrite-pearlite microstructure strengthened by precipitation hardening of VC.
    In this study, the influence of alloying elements, cooling rate and aging temperature on the precipitation hardening behavior of V containing middle carbon steels was investigated. The precipitation hardening is very sensitive to cooling rate and aging temperature. The addition of Si reduced the sensitivity of the cooling rate. The deformation in the austenite region slightly decreases the precipitation hardening. From a detailed analysis, it was found out that the precipitation hardening is strongly influenced by the gamma -&gt;alpha transformation behavior, which indicates that the interphase precipitation plays a significant role for the precipitation hardening.

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  • 高効率多段ホットスタンピング技術 Reviewed

    瀬沼武秀,馬込英明,葉賀一太,藤岡尚浩,竹元嘉利,清水憲一

    塑性と加工   51 ( 7 )   54 - 58   2010.7

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  • Present Status and Future Perspective of Hot Stamping Technology : Key Technology for Lightening Automotive Bodies

    SENUMA Takehide, TAKEMOTO Yoshito

    Journal of the JSTP   51 ( 592 )   410 - 415   2010.5

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    DOI: 10.9773/sosei.51.410

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  • 組織と特性予測の計算工学共通試料試験結果 Reviewed

    計算工学による組織と特性予測技術の最前線 日本鉄鋼協会編   249 - 250   2010.5

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  • Influence of Thermal History on Microstructure and Mechanical Properties of Steels for Hot Stamping Reviewed

    Takehide Senuma, Yoshito Takemoto

    PRICM 7, PTS 1-3   654-656   330 - 333   2010

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    Hot stamping is an attractive method to produce extra high strength automotive components. in the conventional hot stamping, the furnace heating is employed and the heating rate is quite low. To improve the productivity of the hot stamping technology, the reduction of time for the heating process is required. In this study, the influence of the heating rate in a range up to 200 degrees C/s, heating temperatures between 650 degrees C and 950 degrees C and cooling condition on microstructure and mechanical properties of 0.22% C -3%Mn steel has been investigated. The steel is a promising material for the highly productive new hot stamping technology because this steel transformed into martensite from austenite even at cooling in free air. The specimens heat-treated at a high heating rate and for short holding time at the heating temperature just above Ac3 show significantly fine martensite microstructure and a good strength-toughness balance. In this paper, the alpha --&gt; gamma transformation behavior and the gamma --&gt; alpha transformation behavior after inter-critical annealing are discussed to explain the evolution of the microstructures and mechanical properties.

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  • S0304-1-3 Evaluation of Crystal Orientation of Ti-Mo Alloys Using Micro Indentation Test

    KIMURA Noriaki, SHIMIZU Ichiro, TADA Naoya, TAKEMOTO Yoshito

    The proceedings of the JSME annual meeting   2010   265 - 266   2010

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    In recent years, β-type Ti alloys have been attracting much attention for industrial applications, not only by its high specific strength and superior formability but also by special features such as low elastic modulus and extraordinary plastic deformation behavior. However, the studies on β-Ti alloys are still less than those on other types of Ti alloys. Hence, the evaluation processes of various properties of β-Ti alloys have still not been established nevertheless of their importance for industrial applications. The aim of the present study is to evaluate the crystal orientation of grains of β-Ti alloys by means of micro indentation technique. Ti-14Mo and Ti-20Mo alloys, whose primary deformation mechanisms are mechanical twin and coarse slip, respectively, were employed as typical β-Ti alloys. The detailed investigations were performed on the relationship between the crystal orientation and the indentation behavior. The results revealed that the lines which appeared around the indentation of Ti-14Mo almost corresponded to twin boundaries, while those of Ti-20Mo were slip lines. The distortion of indentation shapes also appeared on both Ti-Mo alloys. Based on these results, the procedure of crystal orientation evaluation by micro indentation test was discussed.

    DOI: 10.1299/jsmemecjo.2010.1.0_265

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  • Ti-MoおよびTi-6Mo-X-Y合金の微細組織と機械的性質 Reviewed

    竹元嘉利, 三宅章義, 瀬沼武秀

    日本金属学会誌   73 ( 9 )   752 - 757   2009

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  • Influence of Press Forming Conditions on the Shape Fixability of Hot Stamped Hat-type Parts Reviewed

    Proc. of the 3rd Int. Conf. on Steels in Cars and Tracks   230 - 235   2008.6

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  • Elasto-plastic behavior and its composition dependency of β-type Ti-Mo alloys Reviewed

    Proceedings of JSEM   ( 8 )   274 - 276   2008.6

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  • ホットスタンピング部品の形状凍結性に及ぼす成形条件の影響 Reviewed

    瀬沼 武秀, 馬込 英明, 田邉 章宏, *竹元 嘉利

    塑性と加工   49 ( 567 )   321 - 325   2008.4

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  • Model for Predicting the Microstructural Evolution of Extralow Carbon Steels Reviewed

    Takehide Senuma, Yoshito Takemoto

    ISIJ INTERNATIONAL   48 ( 11 )   1635 - 1639   2008

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    The microstructural evolution of extralow carbon steels in hot working processes has been studied. Considering the experimental results of the microstructural evolution of austenite and the transformation behavior, a metallurgical model for predicting the microstructural evolution of extralow carbon steels in hot working processes was developed. The model was applied to hot rolling processes to evaluate the quantitative effect of various operation conditions on the grain refinement of ferrite and the calculated results were found to correlate relatively well to experimental ones.

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  • Analysis of Fine Stress Fields in Metal Matrix Composites Using HOLZ Patterns Reviewed

    M. Shibata, Y. Takemoto and I. Shimizu

    Materials Science Forum   539-543   848 - 853   2007.7

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  • The effect of deformation mechanism on plastic behavior of β-type Ti-Mo alloys Reviewed

    Ichiro Shimizu and Yoshito Takemoto

    Ti-2007 Science and Technology   1   543 - 546   2007.6

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  • Anelastic behavior of Ti-8mass%Mo alloy by pre-deformation Reviewed

    Yoshito Takemoto, Akira Sakakibara and Takehide Senuma

    Ti-2007 Science and Technology   1   539 - 542   2007.6

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  • Recrystallization behavior and texture formation of rapidly annealed cold-rolled extralow carbon steel sheets Reviewed

    Takehide Senuma, Kaoru Kawasaki, Yoshito Takemoto

    MATERIALS TRANSACTIONS   47 ( 7 )   1769 - 1775   2006.7

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    The influence of a heating rate up to 1000 degrees C/s on recrystallization behavior and texture formation of an extralow carbon steel sheet was investigated. To discuss the experimental results of this investigation, a mathematical model for predicting recrystallization behavior was developed. An analysis using the model shows that the heating rate influences the apparent thermal activation energy of recrystallization. At a higher heating rate, C dissolved from cementite and AlN precipitated during heating decreases and as a consequence the apparent thermal activation energy is lower. This can also be a valid explanation for the fact that recrystallization of a steel sheet coiled at low temperature is retarded. The main orientations of the recrystallization texture are weakened if the heating rate is increased. This tendency has already been observed at the initial stage of recrystallization. If the specimen is heated slowly up to the initial stage of recrystallization, the decrease in the intensity of the main orientations is reduced even though the heating rate subsequently increases. This result indicates that, concerning formation of the recrystallization texture, the heating rate mainly influences the nucleation process.

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  • Change of elastic behavior in binary beta-type Ti alloys with deformation Reviewed

    Y Takemoto, L Shimizu, A Sakakibara, T Senuma

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   70 ( 2 )   110 - 113   2006.2

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    The aim of this study is to systematically investigate the elastic behavior with deformation of the binary titanium alloys of TiMo, Ti-Nb and Ti-V. The stress-strain curve using cyclic load-unloading tensile test of alloys composed of alpha '' martensite, e.g. 20Nb and 8Mo, showed the peculiar pseudo-elastic behavior. A little higher content of beta-stabilizer alloys of 38Nb, 10-14Mo and 15-20V, which were composed of 6 and commensurate omega phases by quench, indicated the liner elasticity until the yield but changed to the extreme pseudo-elasticity after {332}&lt; 113 &gt; twin formation. Dynamic observation made clear certain {332}&lt; 113 &gt; twin initially formed on tensile loading disappeared during unloading process. Medium content of beta-stabilizer alloys of 42Nb and 16Mo exhibited a concave downward elastic curve and were deformed by mixture mode of slip and {332}&lt; 113 &gt; twin. On the higher content alloys it was found that the stress level on which Young's modulus begins a rise increases with the increase of alloy content. These elastic features were summarized as change of apparent Young's modulus with increase of strain.

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  • 2元系β型チタン合金の変形に伴う弾性挙動変化 Reviewed

    竹元嘉利, 清水一郎, 榊原精, 瀬沼武秀

    日本金属学会誌   70 ( 2 )   110 - 113   2006

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  • Preparation of structurally controlled dilute molybdenum-titanium alloys through a novel multi-step internal nitriding technique and their mechanical properties Reviewed

    M Nagae, Y Takemoto, T Yoshio, J Takada, Y Hiraoka

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   406 ( 1-2 )   50 - 56   2005.10

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    In order to overcome the recrystallization embrittlement of molybdenum, internally nitrided dilute Mo-Ti alloy specimens having a heavily deformed surface microstructure were prepared by a novel three-step internal nitriding process at 1223-1873 K in N-2 gas. Grain growth behavior and mechanical properties of nitrided specimens were investigated. Primary nitriding of the present alloys below their recrystallization temperature induced a uniform dispersion of ultrafine Ti-nitride precipitates without causing recrystallization. After secondary and tertiary nitriding, those precipitates grew into rod-like particles with a diameter of about 20 nm and a length of 50-120 nm, maintaining their deformed microstructure due to the pinning effect on grain boundary migration. The depth of the region where the recrystallization of the molybdenum matrix was suppressed was greatly dependent on the secondary nitriding temperature. The recrystallization temperature of the specimen subjected to three-step nitriding was elevated above 1873 K. The yield strength at 298 K obtained from nitrided Mo-0.5 wt% Ti alloy was about 1.6 times as high as that of the recrystallized specimen. Ductile-to-brittle transition temperature of nitrided MO-0.5 wt% Ti alloy was about 181 K. (c) 2005 Elsevier B.V. All rights reserved.

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  • Phase transformation of alpha '' martensite structure by aging in Ti-8 mass%Mo alloy Reviewed

    Y Mantani, Y Takemoto, M Hida, A Sakakibara, M Tajima

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   69 ( 4 )   385 - 391   2005.4

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    The orthorhombic alpha" martensite was formed in Ti-8 mass% Mo alloy by quenching from 1223 K. The purpose of this study was to investigate phase transformation of the alpha" martensite structure by isothermal aging. In differential scanning calorimetry curve of the quenched specimen, an exothermic peak that indicated decomposition from the alpha" martensite to a and 8 phases was observed near 780 K, so that isothermal aging was performed at 723 K and 923 K for 9.0 ks. Optical microscopy, X-ray diffraction and transmission electron microscopy were performed to these specimens. Band-like products that were composed of the single variant of omega phase were observed in the quenched alpha" martensite structure. On the other hand, (111)alpha" twins were observed in the 723 K-aged alpha" martensite structure. The quenched alpha" martensite structure indicated low elastic incline and good ductility, whereas the 723 K-aged alpha" martensite structure indicated high yield stress and brittleness. It was pointed out that the omega products were formed to relax the volume expansion from the beta phase to the alpha" martensite, and the (111)alpha" twins were formed during the isothermal aging at 723 K with the extinction of the omega products.

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  • Ti-8mass%Mo合金におけるα"マルテンサイト組織の時効に伴う相変態 Reviewed

    万谷義和,*竹元嘉利,飛田守孝,榊原精,田島守

    日本金属学会誌   69巻4号,385頁~391頁   2005

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  • ω-Phase Product of {112}<111> Twinning Boundary in β-Type Titanium Alloy

    MANTANI Yoshikazu, TAKEMOTO Yoshito, HIDA Moritaka, SAKAKIBARA Akira

    Materia Japan   43 ( 12 )   1020 - 1020   2004.12

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    DOI: 10.2320/materia.43.1020

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  • Heavily Rolled Structure of Ti-Mo Alloy with Non-workhardening

    TAKEMOTO Yoshito, SAKAKIBARA Akira, SHIMIZU Ichiro

    Materia Japan   43 ( 12 )   1026 - 1026   2004.12

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    DOI: 10.2320/materia.43.1026

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  • Phase transformation of alpha '' martensite structure by aging in Ti-8 mass%Mo alloy Reviewed

    Y Mantani, Y Takemoto, M Hida, A Sakakibara, M Tajima

    MATERIALS TRANSACTIONS   45 ( 5 )   1629 - 1634   2004.5

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    The orthorhombic alpha" martensite was formed in Ti-8 mass%Mo alloy by quenching from 1223 K. The purpose of this study was to investigate phase transformation of the alpha" martensite structure by isothermal aging. In differential scanning calorimetry curve of the quenched specimen, an exothermic peak that indicated decomposition from the alpha" martensite to alpha and beta phases was observed near 780K. so that isothermal aging was performed at 723 K and 923 K for 9.0 ks. Optical microscopy, X-ray diffraction and transmission electron microscopy were performed to these specimens. Band-like products that were composed of the single variant of omega phase were observed in the quenched alpha" martensite structure. On the other hand, (1 1 1)alpha" twins were observed in the 723 K-aged alpha" martensite structure. The quenched alpha" martensite structure indicated low elastic incline and good ductility, whereas the 723 K-aged alpha" martensite structure indicated high yield stress and brittleness. It was pointed out that the omega products were formed to relax the volume expansion from the beta phase to the alpha" martensite, and the (1 1 1)alpha" twins were formed during the isothermal aging at 723 K with the extinction of the omega products.

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  • Tensile behavior and cold workability of Ti-Mo alloys Reviewed

    Y Takemoto, I Shimizu, A Sakakibara, M Hida, Y Mantani

    MATERIALS TRANSACTIONS   45 ( 5 )   1571 - 1576   2004.5

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    Three kinds of titanium-molybdenum alloy, Ti-8Mo, Ti-14Mo and Ti-20Mo (mass%), quenched from 1223 K were investigated to clarify the tensile behavior and the cold workability using tensile test and conical cup test. In the quenched state Ti-14Mo showed the superior workability. Ti-20Mo has poor ductility in tensile test, but has relatively good formability in conical cup test. Both Ti-8Mo and Ti-14Mo became brittle through a cold rolling of 50% reduction in thickness; however Ti-20Mo did not change in workability by the cold rolling at all. Hardness remarkably increased with rolling reduction in Ti-8Mo and Ti-14Mo, but was almost constant in Ti-20Mo, especially with Ti-20Mo containing high oxygen. Microstructure of Ti-8Mo and Ti-14Mo rolled until seventy-odd percentage exhibited very fine structure and changed to alpha' + beta and beta structure, respectively. On the other hand Ti-20Mo hardly changed in microstructure by a cold rolling besides the formation of some band-like products. The product was composed of single variant of commensurate omega-phase, whereas the matrix contained four variants of incommensurate omega-phase. It was suggested that the peculiar deformation mechanism of Ti-20Mo was concerned with stress induced transformation of the omega-phase.

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  • An electronic approach to the G.P. zone formation requirement in magnesium and aluminum light metals Reviewed

    Moritaka Hida, Kazuo Takao, Akira Sakakibara, Yoshito Takemoto

    Keikinzoku/Journal of Japan Institute of Light Metals   54 ( 2 )   62 - 68   2004

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    The characteristics in electronic states were investigated by DV-Xα method, which could describe the cluster models for both solid solution (cluster model I) and for G.P. zone (cluster model II) of Mg/Al alloys, Mg-M (M
    Al, Ag, Zn) alloys and Al-M (M
    Mg, Ag, Zn) alloys. The bond order in the cluster model II for G.P. zone increased more than that in the cluster model I for solid solution in the specific alloy systems where the formation of G.P. zone was detected experimentally. Furthermore, the net charge in the cluster model I for solid solution indicated the significant different characteristics from that in the cluster model II for G.P. zone. By changing the bonding length of each cluster model, the local density of the states around the vicinity of Fermi energy varied high sensitively in FCC cluster models (I and II) of Al-Mg alloy, but not so much in HCP cluster models (I and II) of Mg-Al alloy. The energy gap between HOMO and LUMO was recognized from the consideration of the bond contraction of the cluster model II for G.P. zone, which suggesting the increment in electrical resistance because of the formation of G.P. zone.

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  • Formation or Extension of {332} 〈113〉 Twin and Commensurate ω Phase during Tensile Deformation in Ti-14 mass%Mo Alloy Reviewed

    Yoshikazu Mantani, Yoshito Takemoto, Moritaka Hida, Akira Sakakibara

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   68 ( 2 )   106 - 109   2004

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    The purpose of this study is to investigate the textural changing process and the structural changing process of commensurate ω phase during tensile deformation in the metastable β-type Ti-14 mass%Mo alloy that is formed commensurate ω phase by quench. Optical microscopy, X-ray diffraction and transmission electron microscopy were performed for the specimens that were deformed until different tensile strain. In the 5%-strained specimen, many {332} 〈113〉 twins were formed, and commensurate ω phase of specific variant induced upon tensile deformation. In the 25%-strained specimen, secondary twins or slips which divided early formed {332} 〈113〉 twins into pieces were observed. Fine divided deformation texture was observed in the specimen after fracture, and it is considered that commensurate ω phase changed into incommensurate ω phase or transformed reversely to the β phase. The changing processes of deformation texture and commensurate ω phase were indicated from these results.

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  • Wide range observation on crystal zone of single variant of R-phase and martensite in Ti-50.4 at%Ni alloy Reviewed

    Y Takemoto, K Takayama, M Hida, A Sakakibara, J Takada

    MATERIALS TRANSACTIONS   44 ( 8 )   1557 - 1561   2003.8

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    Wide range selected area electron diffraction (SAD) patterns on &lt;110&gt; crystal-zones (CZ) of a single variant of R-phase in Ti-50.4 at%Ni alloy quenched from 1223 K indicated that the &lt;110&gt; CZs can be classified into two types, CZ-A and CZ-B, with respect to the 1/3&lt;110&gt;* reflections. Especially the absence of 1/3&lt;110&gt;* on the CZ-A could not be explained by the models proposed up to now. Based oil the experimental results, a map that expressed the SAD patterns of single R-phase variant on the ( I I I) stereographic projection was presented. It was suggested that the true structure of R-phase should fulfill three conditions on characteristics of SAD patterns, that is, the reproduction of the unique (111) pattern, the absence of 1/3&lt;110&gt;* reflection at the specific planes on CZ-A and the retainment of three-fold symmetry with respect to the [111]. Bending the TEM sample composed of several R-phase variants caused the integration of the R-phase variants, and resulted in the formation of the B19' martensite. However both the single variant and the B19' martensite returned to the initial state of several R-phase variants after 120 hours at room temperature. It was proposed that the unification of the R-phase variants plays art important role on the R-M transformation.

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  • Effect of WC addition on microstructures of laser melted Ni-based alloy powder Reviewed

    YM Zhang, M Hida, A Sakakibara, Y Takemoto

    SURFACE & COATINGS TECHNOLOGY   169   384 - 387   2003.6

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    Nickel-based alloy powder was laser surface melted on the surface of S45C steel substrate with laser beam. The effect of WC addition on the interface layer and microstructures in laser alloyed layer has been investigated by X-ray diffraction analysis, SEM and TEM. There are three zones in the laser alloyed layer. The interface zone is shown as a bright layer of single gamma-(Fe,Ni) phase. After the addition of WC, the interface changes from flat state to rough state, and the primary arms have smaller cellular structures on the interface. Eutectic of gamma-(Fe,Ni) + Fe23B6 in NiCrBSi sample changes into gamma-(Fe,Ni) + Fe3B in NiCrBSi + 10 wt.% WC sample. In this sample, the eutectic zone approximately 20 mum in width shows fine structure which may be caused by eutectic structure prior growth due to eutectic temperature decrease. The martensite in heat-affected zone is formed due to the decrease of the critical cooling rate. (C) 2003 Elsevier Science B.V. All rights reserved.

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  • Effecs of Atomization Gas and Heat Treatment on Arc-Sprayed Ti Composite Coatings

    SAKODA Nobuaki, HIDA Moritaka, SAKAKIBARA Akira, TAKEMOTO Yoshito, TAJIRI Toshiro

    Journal of Japan Thermal Spraying Society   40 ( 2 )   52 - 56   2003.4

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  • Influence of WC addition on microstructures of laser-melted Ni-based alloy coating Reviewed

    YM Zhang, M Hida, A Sakakibara, Y Takemoto

    JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE   11 ( 6 )   667 - 674   2002.12

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    Nickel-based alloy powder was surface melted on S45C steel substrate using a CO2 laser. The effect of tungsten carbide (WC) on the interface layer and microstructures in the laser melted layer has been investigated by x-ray diffraction (XRD) analysis, and by scanning and transmission electron microscopy (SEM and TEM) techniques. There are three zones in the laser melted layer: the alloyed zone, the interface zone, and the heat affected zone of substrate. The interface zone appears as a smooth bright layer of single gamma-(Fe, Ni) phase that serves as a primary crystallization phase in the laser alloyed zone. K-S lattice correspondence was recognized between gamma-(Fe, Ni) in the interface and martensite in the substrate. The size of dendritic crystals decreased and eutectic structures in the laser alloyed layer changed after the addition of WC.

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  • Scanning probe microscopic observation of a surface precipitation of Mg-6 mass%Al alloy Reviewed

    Moritaka Hida, Koichi Imada, Akira Sakakibara, Yoshito Takemoto

    Keikinzoku/Journal of Japan Institute of Light Metals   52 ( 3 )   126 - 130   2002

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    Surface and interior precipitations of Mg-6 mass%Al alloy were morphologically studied by SPM observation with AFM and KFM modes, TEM and XRD methods. The hardness increment due to the precipitation was negligibly small. According to AFM contrast the precipitates on the surface were identified as droplet-like particles (1∼4 μ4)
    on the other hand the ones formed in the alloy as needle-like (∼1 μm). It was confirmed by XRD that both types of the precipitates had γ-structure (Al12Mg17), and the peak height of the surface precipitates was about 3 times as high as that of the interior ones. The droplet-like precipitates projecting from the surface had a higher KFM electric potential than that of the matrix solid solution, however the precipitates embedded in either the surface layer or the matrix had a lower KFM electric potential.

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  • Microstructure of alloyed layer and nitriding process in foreign metals under arc sprayed Ti composite coating Reviewed

    Nobuaki Sakoda, Moritaka Hida, Yoshito Takemoto, Akira Sakakibara, Toshiro Tajiri

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   66 ( 12 )   1304 - 1310   2002

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    We investigated the nitriding process and the microstructure of the alloyed layer between foreign metals under composite arc spraying using two different wire materials, Ti and the paired metal (Mo, Ni, Cu and Al). The Ti element in the composite coatings (Ti-Mo, Ti-Ni, Ti-Cu and Ti-Al) was of TiN and/or TiN0.3, and the oxide or nitride of the paired metal was not found in the coatings. An intermetallic compound (Ti2Al) in the Ti-Al coating was detected in the XRD pattern, but none was detected in the other coatings. It is considered that the reaction of Ti with foreign metal occurs only in the solidification process at the moment of droplet impact. The composite coatings were of very dense packing, and had the diffusion layer in the interface region between the foreign metals. The solute element, Ti in the composite coating Ti-Mo, reacted with nitrogen to form many micrograins of TiN0.3 within molten Mo during thermal spraying. In the other coatings (Ti-Ni, To-Cu and Ti-Al), eutectics were mainly identified, and the Ti nitride in the alloyed layer between foreign metals was only TiN0.3. In addition, the intermetallic compounds, which were not detected in the XRD pattern, were identified in the TEM observation.

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  • Formation of α″ martensite and {332} 〈113〉 twin during tensile deformation in Ti-40 mass%Nb alloy Reviewed

    Yoshikazu Mantani, Yoshito Takemoto, Moritaka Hida, Akira Sakakibara

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   66 ( 10 )   1022 - 1029   2002

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    The α″ martensite phase in the quenched Ti-40 mass%Nb alloy transforms reversely to the β phase upon short-time aging at 623 K for 0.9 ks, resulting in the β + ω microstructure in the aged specimen. The relationship between the tensile property and the microstructure of this specimen was investigated by the observation of the structural changes in the quenched and aged specimen during tensile deformation. Products of the β phase, which were similar to {332} twins, surrounded by the matrix of α″ martensite were formed in the quenched specimen upon tensile deformation. In the aged specimen, on the other hand, α″ martensites and {332} twins were formed upon tensile deformation. The amount of α″ martensite in the two specimens was larger in the nonuniformly deformed area near the fracture. In particular, concentrated slip occurred in the nonuniformly deformed area of the aged specimen accompanied by the extinction of ω phases. The results indicate that the α″ transformation and then the reverse α″→β transformation were involved in the formation of {332} twins. It is suggested that the formation of {332} twins was due to lattice instability, and that besides the role of deformation resistance, ω phases played a part in nonuniform deformation.

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  • Evaluation of bonding state of BCC(Fe) edge dislocation core by DV-X alpha cluster method Reviewed

    T Fukuda, M Hida, A Sakakibara, Y Takemoto

    MATERIALS TRANSACTIONS   42 ( 11 )   2232 - 2237   2001.11

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    The bonding state has been studied by the discrete variational (DV)-X alpha method in the vicinity of the core of the Peierls-Nabarro edge dislocation in the BCC(Fe) crystal the slip systems of which are {112}&lt; 111 &gt; and {110}&lt; 111 &gt;. Bond order and net charge distribution were evaluated in the perfect crystal model cluster and edge dislocation core model cluster with 32 atoms. In the {112}&lt; 111 &gt; slip system. the total bond order of the nearest neighbor atom pairs in the dislocation model was found to be relatively larger than that in the perfect crystal model. On the other hand, the total bond order of the second neighbor atom pairs in the dislocation model was a little smaller than that in the perfect crystal model. It was also found that there was asymmetry in the bond order between the (110) plane on the left side and the one on the right side of the (110) plane which contains the core atom of dislocation. Net charge and its effect in the dislocation model were larger and wider than those in the perfect crystal model. Almost the same results were also attained for the {110}&lt; 111 &gt; slip system.

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  • Development of Highly Ductile and Strengthened Mo Alloys due to Recrystallization Control by Multi-step Preferred Nitriding Reviewed

    TAKADA Jun, NAGAE Masahiro, HIRAOKA Yutaka, TAKEMOTO Yoshito

    Bulletin of the Japan Institute of Metals   40 ( 7 )   666 - 667   2001.7

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    DOI: 10.2320/materia.40.666

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  • Microstructure of a molybdenum nitride layer formed by nitriding molybdenum metal Reviewed

    M Nagae, T Yoshio, Y Takemoto, J Takada

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   84 ( 5 )   1175 - 1177   2001.5

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    For pure molybdenum nitrided at 1373 K in NH, gas, microstructural observations of a molybdenum nitride layer were conducted through a transmission electron microscope. The molybdenum nitride layer consisted of two molybdenum nitrides: an outer one of gamma -Mo2N and an inner one of beta -Mo2N. A great number of (011)[0(1) over bar 1] type twins were observed in the beta -Mo2N phase, whereas the microstructure of the gamma -Mo2N phase was almost free from lattice defects except for slightly observed (111)(112) type twin.

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  • An evaluation of bonding states of BCC (Fe) edge dislocation core by DV-Xα cluster method Reviewed

    T. Fukuda, M. Hida, A. Sakakibara, Y. Takemoto

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   65 ( 9 )   852 - 857   2001

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    Bonding states near the BCC (Fe) edge dislocation core based on the Peierls-Nabarro dislocation model have been studied by discrete variational (DV)-Xα method. The slip systems are {112}〈111〉 and {110}〈111〉. The molecular orbital calculation for the cluster models with 32 atoms belonging to the perfect crystal and Peierls edge dislocation core models were carried out for estimating bond order and net charge distribution among atoms in the cluster models. In {112}〈111〉 slip system total bond order between the nearest neighbor atoms of the dislocation model was found to be larger than that of the perfect crystal model. On the other hand, total bond order of the second neighbor atoms in dislocation model was a little smaller than that in the perfect crystal model. It was also found that there was asymmetry in the bond order between the left side and the right side of the (110) plane which contains the core atom of dislocation. Net charge in the dislocation model was larger than that in the perfect crystal model. Almost the same results were also attained for the {110}〈111〉 slip system.

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  • Analysis of fine strain field around precipitates using a HOLZ pattern Reviewed

    Y Takemoto, M Nagae, M Hida, A Sakakibara, J Takada

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   64 ( 5 )   283 - 286   2000

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    Fine strain fields around TiN precipitates in Mo alloys, were analyzed by a newly proposed HOLZ (High Order Laue Zone) pattern method, using transmission electron microscopy. The shape of the TiN precipitates changed into three different types after heat treatment thin plate, rod and sphere. The thin foils for TEM observation were prepared by an electro-polish method. It was found in preliminary experiments using pure Mo that the appropriate condition to obtain a good HOLZ pattern for bcc materials was to choose an orientation which satisfied both low density and uniform distribution of reciprocal spots within the zero order Laue zone. The HOLZ patterns were therefore acquired from the [410] direction of the matrix at room temperature using a convergent electron probe 8.8 nm in diameter operated at 200 kV. Many HOLZ patterns were taken by shooting the electron probe within 150 nm x 150 nm areas that included a precipitate. These patterns were imported into a personal computer using a scanner. It was found that the HOLZ patterns hardly changed its configuration with position but moved as a whole within the center disk depending on position, suggesting lattice rotation of the matrix. The vector maps which indicated the degree and direction of lattice rotation around a precipitate were produced for three types of precipitates. The thin plate of TiN generated a symmetrical mountainous strain field. The rod yielded an asymmetrical valley strain field, and the sphere hardly influenced the matrix. It is considered that the difference in the form of the strain field depending on the shape of precipitate was caused by the degree of coherency between the matrix and the precipitates.

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  • Deformation induced structural change of quenched ω phase in Ti-20 mass%Mo alloy Reviewed

    Yoshikazu Mantani, Yoshito Takemoto, Moritaka Hida, Akira Sakakibara, Kazuyoshi Takayama, Hidehiro Yasuda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   64 ( 10 )   934 - 939   2000

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    Tensile testing the Ti-20 mass%Mo alloy quenched from 1223 K was performed at 293 K, 623 K and 723 K to investigate the effects quenched ω phase on the mechanical properties. Nominal stress-strain curves after yielding became horizontal with increasing deformation temperature. When deformed at 293 K the dislocation structure observed by TEM had a feature of planner slip concentrated in a banded area. When deformed at elevated temperatures, on the other hand, wavy dislocations were observed to form a cell structure. The specimen deformed after thinning for TEM foil showed the formation of a band product which consisted a single ω-c$/ variant in the vicinity of the crack tip. In situ tensile test in TEM revealed that ω-IC$/ changed into ω-c$/ as deformation progressed. It is considered from these results that deformation behavior at elevated temperatures approached to that of bcc metals because of the stabilization of the β phase, and that the deformation behavior at room temperature was affected by the band product which consists of a single ω-c$/ variant transformed from ω-IC$/. It is further suggested that ω-c$/ can play an obstructing role to the ductility.

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  • Mechanical properties of molybdenum alloys micro-structurally controlled by internal nitriding Reviewed

    M Nagae, J Takada, Y Hiraoka, Y Takemoto, T Yoshio

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   64 ( 9 )   751 - 754   2000

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    Internally nitrided dilute Mo-Ti alloys having a heavily deformed microstructure near the specimen surface were prepared by a novel two-step nitriding; process at 1173 to 1773 K in N-2 gas. For the nitrided specimens, three-point bend tests were performed at temperatures from 77 to 298 K in order to investigate the effect of microstructure control by internal nitriding on the ductile-brittle transition temperature (DBTT) of the alloy. Yield strength obtained at 243 K of the specimen maintaining the deformed microstructure by the two-step nitriding was about 1.7 times as much as recrystallized specimen. The specimen subjected to the two-step nitriding was bent more than 90 degree at 243 K, whereas recrystallized specimen was fractured after showing a slight ductility at 243 K. DBTT of the specimen subjected to the two-step nitriding and recrystallized specimen was about 153 K and 203 K, respectively. These results indicate that multi-step internal nitriding is very effective to the improvement in the embrittlement by the recrystallization of molybdenum alloys.

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  • Interface structure in A6061 aluminium alloy matrix composite reinforced with aluminium borate whiskers Reviewed

    M Shibata, Y Takemoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   64 ( 1 )   1 - 6   2000

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    A6061 aluminium alloy matrix composites reinforced with aluminium borate whiskers were manufactured using squeeze casting. The interface between the whisker and matrix was observed using high resolution electron microscopy. The aluminium borate whisker and magnesium in the A6061 aluminium alloy interacted during casting and the spinel (MgAl2O4) which nucleated at the interface grew during heat treatment. The whisker/spinel interface had coherency, but the whisker/matrix interface had none. Many lattice defects were observed in the spinel, and were probably produced by misfits at the whisker/spinel interface. Multi-slice simulation indicated that stacking faults are one of the defects.

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  • Recrystallization control of dilute molybdenum-titanium alloys by multi-step internal nitriding Reviewed

    M Nagae, J Takada, Y Takemoto, Y Hiraoka, T Yoshio

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   64 ( 9 )   747 - 750   2000

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    The control of microstructure and recrystallization temperature in the internally nitrided dilute Mo-Ti alloys was studied through a novel three-step nitriding process at 900 to 1600 degreesC in Na gas, in order to develop highly ductile Mo alloys having a heavily deformed microstructure near the specimen surface. Primary internal nitriding process below the recrystallization temperature of the present alloys at around 1000 degreesC brings uniform dispersion of superfine Ti-nitride precipitates in the Mo matrix where the deformation microstructure remains. These superfine precipitates decompose and disappear after heating at 1200 degreesC in a vacuum. However, after secondary nitriding at 1500 degreesC in a nitrogen atmosphere, those particles grew up to be stick-shaped particles with a length of 50 to 120 nm without the recrystallization of Mo matrix within about 130 mum from the specimen surface. The depth of the region where the recrystallization of Mo matrix was suppressed was greatly dependent upon the secondary nitriding temperature. The third nitriding was conducted at 1500 or 1600 degreesC. For the specimen nitrided at 1600 degreesC, the recrystallization temperature in a vacuum was elevated above 1600 degreesC.

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  • Mechanically stimulated reaction of metal/polymer mixed powders Reviewed

    Moritaka Hida, Hiroki Iwabu, Akira Sakakibara, Yoshito Takemoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   46 ( 12 )   1309 - 1314   1999

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    Mechanical grinding (MG) with mechanically stimulated reaction was performed on metal/polymer mixed powders. The starting materials used in this study were the metals of Mg, Ti and Mg2Ni powders, and polymer of PTFE, PVC and PE powders. The MG process was investigated using XRD, IR, SEM and TEM. According to XRD results, magnesium fluoride (MgF2, TiF2) and chloride (MgCl2) were detected from MG products of the Mg/PTFE, Ti/PTFE and Mg/PVC blending systems, respectively. Explosive reaction was found during MG of both Mg/PTFE and Ti/PTFE. It was also confirmed by XRD results that the production of MgF2 had already been formed just before the explosive reaction in Mg/PTFE system. It was found from IR analysis that C-C single bond in the polymers, not only both in PTFE and PVC but also in PE, changed to double bond C = C. Hydrogen produced due to decomposition of PE on blending Mg2Ni/PE was absorbed into C-Mg2Ni-H as amorphous solutes. These mechanically stimulated reaction was powerful method for decomposition of engineering plastics.

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  • Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K Reviewed

    M Nagae, S Okada, M Nakanishi, J Takada, Y Hiraoka, Y Takemoto, M Hida, H Kuwahara, MK Yoo

    INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS   16 ( 2 )   127 - 132   1998

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    For Mo-0.5 mass% Ti and pure Mo alloy nitrided in a NH3 gas at a relatively low temperature of 1373 K, microstructural observations through optical and transmission electron microscopes, X-ray diffraction analysis and hardness measurements were carried out. A surface nitriding layer with very high hardness of approximately H nu similar to 1800 consisted of two Mo-nitride regions: an outer one of gamma-Mo2N and an inner one of beta-Mo2N. The inward diffusion of nitrogen is a rate-controlling process in the growth of the surface nitriding layer. In Mo-Ti alloy additionally an internal nitriding layer with relatively high hardness of H nu similar to 800 was formed beneath the surface nitriding layer. Such high hardness in the internal nitriding layer was found to result from the uniform dispersion of extremely fine plate-like particles of titanium nitride. The particles are approximately 0.4 nm thick and have coherent strain field in the matrix. (C) 1998 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0263-4368(98)00005-5

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  • Non-uniform deformation of Fe-3%si alloy single crystals Reviewed

    Moritaka Hida, Xiaoping Jiang, Yoshito Takemoto, Kazuaki Yamamoto

    Zairyo/Journal of the Society of Materials Science, Japan   47 ( 10 )   1046 - 1052   1998

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    Fe-3%Si alloy single crystals were deformed in tension along the [110] or [001] axis at 77K and 298K in order to study the necking behavior. Two types of deformation band, kink band and band of secondry slip were formed on necking section of specimens deformed at 298K along the [110] or [001] axis, respectively. Cell structure of dislocations in deformed single crystals appeared on the necking section in both axes. Such dislocation structure is supposed to influence non-uniform deformation of the crystals.

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  • Comparison of Nitriding Behavior of Mo-Ti Alloys in NH3 and N2 Gases Reviewed

    Masahiro Nagae, Akihiro Kunisada, Jun Takada, Yutaka Hiraoka, Yoshito Takemoto, Moritaka Hida, Hideyuki Kuwahara

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   45 ( 2 )   189 - 194   1998

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    For dilute Mo-Ti alloys and pure Mo nitrided at 1100°C for 16h in NH3 and N2 gases, microstructural observations through optical and transmission electron microscopes, X-ray diffraction analysis and hardness measurements were carried out and the nitriding behavior in N2 and NH3 gases was compared. A surface layer of γ-Mo2N with Hv∼1700 was formed for the nitriding in NH3 gas of 1 atm. In contrast, the surface layer was absent for nitriding in N2 gas at pressures below 10 atm, whereas the β-Mo2N layer was formed at a pressure of 15 atm. In an internal nitriding layer formed beneath the surface layer of Mo-Ti alloys nitrided in NH3 gas, extremely small and plate-like particles of 2∼4nm in width and approximately 0.45nm in thickness were clearly found to precipitate on {100} planes of the matrix. Furthermore, a large coherent strain field was observed in the matrix around each Ti-nitride precipitate. Such a dispersion of the small precipitates resulted in remarkable hardening in the nitrided alloy. The hardness of the internal nitriding layer of the alloys nitrided in NH3 gas was much higher than that in N2 gas. The difference in hardness can be explained in terms of the differences not only in size of the Ti-nitride precipitates but also in their distribution density.

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  • Antiphase domain boundary tubes in plastically deformed Fe-Al alloys with B2 ordered structure Reviewed

    ZY Song, M Hida, A Sakakibara, Y Takemoto

    SCRIPTA MATERIALIA   37 ( 11 )   1617 - 1622   1997.12

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    DOI: 10.1016/S1359-6462(97)00328-X

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  • Deformation and microstructure of Ti-14Mo alloy in over aged state Reviewed

    Y Takemoto, M Hida, A Sakakibara

    MATERIALS TRANSACTIONS JIM   38 ( 12 )   1067 - 1071   1997.12

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    Deformation and microstructure were investigated on Ti-14 mass%Mo alloy in over aged state using the duplex aging method. In the over aged state only hardness decreased in spire of no change in both size and composition of omega phase. Though the omega phase aged at 623 K for 1 x 10(6) s had the maximum hardness and resulted in the brittle fracture through omega--&gt;beta " transformation, they became soft by over aging and transformed to a phase within the deformation band. The a particles in the band were sheared by {10 (1) over bar 1}(alpha) twinning which direction was perpendicular to the band product. The twinning of alpha particles was regarded as a complementary deformation with volume change in the omega--&gt;alpha transformation. It was suggested that the occurrence of the band product consisted of beta+alpha phases would not be directly connected with brittle fracture.

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  • In situ observation of stress-induced martensitic transformation and plastic deformation in TiNi alloy Reviewed

    XP Jiang, M Hida, Y Takemoto, A Sakakibara, H Yasuda, H Mori

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   238 ( 2 )   303 - 308   1997.11

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    Stress-induced martensitic transformation and plastic deformation in TiNi alloy have been investigated using transmission electron microscope with an in situ deformation technique. It was found that martensite bands were formed and grew with increasing strain and shrank with decreasing strain in tension. In the second deformation stage, a high density of looped dislocations was formed in the reverse-transformed matrix, while in the first deformation stage dislocations were not formed in the reverse-transformed matrix. The formation of dislocation in the second deformation stage is considered as bearing a relation to reverse martensitic transformation and twinning dislocations lying inside the stress-induced martensite. (C) 1997 Elsevier Science S.A.

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  • Solid solubility and transformation in mechanically alloyed Ti-Mg powders Reviewed

    M Hida, K Asai, Y Takemoto, A Sakakibara

    MATERIALS TRANSACTIONS JIM   37 ( 11 )   1679 - 1683   1996.11

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    Mechanical alloying (MA) was examined by ball-milling the powder mixtures of various starling compositions, Ti-10, 20, 30, 40, 50, 60, 70, 80, 95 at%Mg plus 2 mass%NaCl powder. NaCl powder was an excellent anti-sticking agent for MA. The process of MA was mainly followed by X-ray diffraction and TEM methods. Super-saturated quasi-solid solution was formed for the samples up to 60 at%Mg. A single hcp structure was newly created up to 30 at%Mg samples, and over this composition range hcp peaks were present in addition to the diffraction pattern which will lead to bcc like nano-crystallite. In the Mg-rich side, Ti-70 similar to 95 at%MA samples showed the coexistence of hcp phases, Ti-based and Mg-based dilute solid solution. The solubility was estimated from the change of lattice constant. But it was somewhat difficult to detect the alloying effect of MA on Mg and Ti in Ti-95 at%Mg sample. MA samples, Ti-20 and -50 at%Mg, showed the starting of phase separation after one hour annealing at 673 and 473 K, respectively.

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  • Characterization of glass/steel interfacial zone Reviewed

    M Hida, Y Takemoto, ZY Song, M Sawada

    JOURNAL OF MATERIALS SCIENCE LETTERS   15 ( 19 )   1669 - 1673   1996.10

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  • High-resolution transmission electron microscopic observation of stacking faults in Fe-35 mol%Al alloy with ordered B2 structure

    ZY Song, M Hida, A Sakakibara, Y Takemoto

    MATERIALS TRANSACTIONS JIM   37 ( 2 )   109 - 114   1996.2

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    Stacking faults in an Fe-35 mol%Al alloy with the B2 ordered superlattice structure have been investigated by a diffraction contrast method of transmission electron microscopy (TEM). The detailed observation by a phase contrast method of high-resolution transmission electron microscopy (HRTEM) has also been performed on the alloy. Two types of stacking faults were observed by HRTEM. In order to interpret the experimental images, computer simulations of HRTEM images based on different fault models have been carried out. The image simulations reveal that the model of the stacking faults deduced from the diffraction contrast method of TEM (i.e. the displacement vector R = a[100]/2) cannot fit one type of the HRTEM images. In the present study, a possible model of the faults (R = (1 - root 3)a[100]/2) and a mechanism for their production are proposed.

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  • Effect of phase transformation on localized deformation in Ti-Ni shape memory alloy Reviewed

    Xiaoping Jiang, Moritaka Hida, Yoshito Takemoto, Akira Sakakibara, Shuzo Fujii

    Zairyo/Journal of the Society of Materials Science, Japan   45 ( 4 )   411 - 416   1996

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    Localized deformation of Ti-50.6at. pct Ni shape memory alloy subjected to tensile loading at different temperatures (≳Af) was studied by means of the observation of internal structure. The rolled sheet specimens were subjected to three types of heat treatments, i.e. annealing at 673K (AC), solution-treatment at 1173K (AQ), and aging at 873K after solution-treatment (AS). It was found AQ and AS specimens that the deformation after the yielding in tensile test was caused by the stress-induced martensite (SIM) transformation, and also by the movement of dislocations which was restricted in martensite bands. The deformation in AQ and AS specimens, therefore, were more localized than in AC specimen where the dislocations were introduced both in the matrix and martensite.

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  • Martensitic {332}〈113〉 twin in β type Ti-Mo alloy Reviewed

    Yoshito Takemoto, Moritaka Hida, Akira Sakakibara

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   60 ( 11 )   1072 - 1078   1996

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    The formation mechanism of {332}〈113〉 twin, one of the deformation modes in metastable β type titanium alloys, was examined by high resolution transmission electron microscopy (HR-TEM) and simulation. The interface structure of twin resembled to α″ martensite. Peculiar movement of atoms to form {332}〈113〉 twin was explained by the β→α″ process followed by the α″→β twin inverse transformation process. The former process brought about convenient conditions to form {332}〈113〉 twin
    the atom displacement direction was parallel to 〈113〉, habit plane agreed with {332}, shear strain was 0.2907 and volume change was 0.4% expansion. The parameters of α″ obtained by calculation were a=0.3050 nm, b=0.4913 nm and c=0.4596 nm. Subsequently α″→β twin inverse transformation generated by a shear strain of 0.0628 results in {332}〈113〉 twin having a shear strain of 0.3535. It was suggested that atom displacement and compressive stress field with the martensitic transformation would yield a single ω variant or many defects in the twin band.

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  • HRTEM observation of gradient interface structure of glass/steel joint Reviewed

    Moritaka Hida, Yoshito Takemoto, Nobumichi Itatani, Masamitsu Sawada

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   59 ( 12 )   1273 - 1277   1995

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    It has been considered that glass to metal joining is realized by the effects of mechanical anchoring and chemical composition gradient. These effects contribute to prevent glass peeling off caused by the difference in thermal expansion coefficient between glass and metal coupled. In order to clarify these ideas, the interfacial microstructures were studied with a high resolution analytical electron microscope. From the experimental results we found that the interfacial zone was composed of a very complex shape acting as the anchoring effect, and the transitional layer of approx.20 nm in thickness between glass and steel substrate was formed in the layer subjected to the chemical effect. The glass region in the transitional layer with the gradient of the iron component into the glass matrix was kept under the compressive displacement of approx.10%.

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  • DEFORMATION-INDUCED TRANSFORMATION OF OMEGA-PHASE IN AGED TI-14 MASS-PERCENT-MO ALLOY Reviewed

    Y TAKEMOTO, M HIDA, A SAKAKIBARA

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   59 ( 8 )   780 - 787   1995

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    Ti-14 mass%Mo alloys aged for 1x10(6) s at 623 K were deformed by means of a tensile test at 300, 523, 623 and 723 K in Ar atmosphere or of rolling at room temperature in order to investigate the brittle fracture mechanism related to the omega phase. These deformed specimens were observed by optical and transmission electron microscopy. Both deformed structures consisted of many band-like products. In the products, very few omega particles could be found. Instead, zones having a structure different from omega, beta and alpha phases existed. It was found that these zones possessed a body centered triclinic structure, which was newly named beta '' on account of the structural similarity to the beta phase. The beta '' was transformed from omega by deformation. In the transformation process to beta '', one omega variant changed into two types of beta ''; one was closely related to the beta matrix, and the other had a {112}[111] twin relation to the former. It is suggested that the band products act as a path of crack propagation prior to the brittle fracture in the aged Ti-Mo alloy.

    DOI: 10.2320/jinstmet1952.59.8_780

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  • STRUCTURAL STABILITY AND MECHANOCHEMICAL ACTIVITY OF TITANIUM NITRIDE PREPARED BY MECHANICAL ALLOYING Reviewed

    WY LIM, M HIDA, A SAKAKIBARA, Y TAKEMOTO, S YOKOMIZO

    JOURNAL OF MATERIALS SCIENCE   28 ( 13 )   3463 - 3466   1993.7

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    Pure titanium nitride (TiN) was synthesized by mechanical alloying (MA). In order to prevent the contamination from the MA vial and atmospheric gas, the MA steel vial was replaced with a titanium vial and atmospheric gas was deoxidized using sponge titanium heated to 623 K. The mechanochemical activity during MA was estimated from the gas purification temperature. The investigation of thermal and pressure stability by thermal treatment and hot isostatic pressing (HIP) revealed that titanium nitride, TiN, was stable on heating to 1173 K under a vacuum, but became unstable under a high pressure, 100 M Pa.

    DOI: 10.1007/BF01159823

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  • Mechanism of ω→α Transformation in β-Ti Alloy Reviewed

    J. Japan Inst. Metals   57 ( 3 )   261 - 267   1993

  • STRUCTURAL RELAXATION OF INTERFACE OF (332) (113) TWIN IN BETA-TI ALLOY Reviewed

    Y TAKEMOTO, M HIDA, A SAKAKIBARA

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   57 ( 12 )   1471 - 1472   1993

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    DOI: 10.2320/jinstmet1952.57.12_1471

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  • THE DSC AND EXAFS STUDIES OF MECHANICAL AGITATION EFFECTS ON THE LOCAL-STRUCTURE OF SPLAT-COOLED AMORPHOUS NI75SI8B17 ALLOY

    M HIDA, Y TAKEMOTO, A SAKAKIBARA, H MAEDA

    JOURNAL OF NON-CRYSTALLINE SOLIDS   144 ( 2-3 )   196 - 202   1992.7

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    Effects of mechanical agitation, extreme cold working, on the structural changes of splat-cooled amorphous alloy were investigated by the differential scanning calorimetry (DSC) and extended X-rav absorption fine structure (EXAFS) methods. The amorphous alloy composed of both matrix and Ni-enriched clusters did not have a detectable endothermic reaction. Since an amorphous alloy agitated by filing did have an endothermic reaction related to a decrease of glass transition temperature as measured by DSC. mechanical agitation has an effect on the structural relaxation and is interpreted with a proposed hierarchy diagram. The filed amorphous phase was changed by milling for 20 h into a chemically homogeneous amorphous state. Further. by milling for 100 h it eventually changed to an amorphous state such as a supercooled liquid matrix with small mean bond distance. Its glass transition temperature, T(g), was decreased to near room temperature. In this state, molecular clusters with large bond distance were separated as a precursor of metastable phase from the supercooled liquid.

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  • DUCTILITY IMPROVEMENT OF TI-MO ALLOY DUE TO TITANIZING Reviewed

    Y TAKEMOTO, M HIDA, A SAKAKIBARA, N NISHIDA

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   56 ( 5 )   524 - 530   1992

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    Diffusion heat-treated Ti-20 mass % Mo (DHT) alloys were prepared by titanizing to improve the ductility, and tested in tension. The DHT alloy had a diffusion layer about 120-mu-m in thickness. The quenched DHT alloy was deformed by twinning in the surface layer and by slip in the interior. Many cracks were generated over the surface of the aged specimen during testing, but the propagation of these cracks were prevented at the interface between the titanized surface layer and the interior. Both the quenched and the aged DHT alloys were elongated well in comparison with non DHT alloys. The formation of diffusion layer in DHT alloy caused a mismatch of deformation modes between the surface layer and the interior.
    It was observed using HR-TEM that the growth of omega-particles were remarkably retarded in the interior of aged DHT alloy, and the center of the omega-particle was reversely transformed to beta-phase. It was also found that an unusual fcc phase was formed by the stress induced stacking faults at the interface.

    DOI: 10.2320/jinstmet1952.56.5_524

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  • Ti Fiber-Reinforced and Ti Sheet-Enveloped Cast Mg Composite Reviewed

    Moritaka Hida, Akira Sakakibara, Yoshito Takemoto, Hiroyuki Okada, Seiji Koga

    journal of the japan society of powder and powder metallurgy   39 ( 6 )   464 - 467   1992

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    DOI: 10.2497/jjspm.39.464

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  • SOLUTE ENRICHMENT IN THE OMEGA PHASE IN TI-14MO Reviewed

    Y TAKEMOTO, M HIDA

    SCRIPTA METALLURGICA ET MATERIALIA   25 ( 2 )   299 - 302   1991.2

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    DOI: 10.1016/0956-716X(91)90182-Z

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  • EXAFS AND DIFFRACTION STUDIES OF ATHERMAL AGITATION EFFECTS ON THE LOCAL-STRUCTURE OF AMORPHOUS NI75SI8B17 ALLOY Reviewed

    M HIDA, H MAEDA, K KANI, H MORI, A SAKAKIBARA, Y TAKEMOTO

    JOURNAL OF NON-CRYSTALLINE SOLIDS   117 ( 118 )   144 - 147   1990.2

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  • Mechanically Alloyed Ti-Mo Solid Solution and Its Microstructure

    Woo-Yeong Lim, Moritaka Hida, Akira Sakakibara, Yoshito Takemoto, Hironobu Meada, Eiichi Sukedai

    J. Japan Society of Powder and Powder Metallurgy   37 ( 5 )   636 - 639   1990

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    Mixture of Ti and Mo powders was mechanically alloyed to obtain β-type Ti-20mass-%Mo alloy. The mechanism of mechanical alloying(MA) of Ti-20mass%Mo and microstructure of its product were investigated by X-ray diffraction, XAFS and TEM. X-ray diffraction profile showed that complete alloying was attained by the 36ks-MA, but incompleteness was revealed by the analysis of XAFS. According to the result of XAFS, 144ks-MA was needed to accomplish alloying. The radial structural parameters of j-th shell, R j , N j and σ j are obtained by curve fitting method on a two-shell, double Mo-Mo and Mo-Ti pairs. Nearest neighbor bond length(R j ) decreased with the time of MA. From the observation of TEM, it was revealed that mechanically alloyed particle was composed of small domains with different lattice images in direction, like subgrains. Deformation of the lattice image was also recognized for the MA specimen.

    DOI: 10.2497/jjspm.37.636

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  • CHANGE OF DEFORMATION MODE CAUSED BY AGING OF TI-14 MASS-PERCENT MO ALLOY SINGLE-CRYSTALS AND EMBRITTLEMENT MECHANISM DUE TO THE OMEGA-PHASE Reviewed

    Y TAKEMOTO, M HIDA, E SUKEDAI, A SAKAKIBARA

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   53 ( 10 )   1004 - 1012   1989.10

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    DOI: 10.2320/jinstmet1952.53.10_1004

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  • INFLUENCES OF ENVIRONMENT IN HEAT-TREATMENT AND PRE-AGING AT ROOM-TEMPERATURE ON AGE-HARDENING OF TI-MO ALLOYS Reviewed

    M HIDA, E SUKEDAI, Y TAKEMOTO

    MATERIALS TRANSACTIONS JIM   30 ( 2 )   102 - 106   1989.2

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    DOI: 10.2320/matertrans1989.30.102

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Books

  • 機械材料学 第5版 Reviewed

    箕島弘二( Role: Contributor ,  p.230-235)

    日本材料学会  2022.10  ( ISBN:978-4-901381-58-1

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    Total pages:439   Responsible for pages:p.230-235   Language:Japanese Book type:Textbook, survey, introduction

MISC

  • OS0102-133 Influence of Strain Path Change on Plastic Deformation Behavior of Ti-Nb Alloys under Biaxial Compressions

    ISHIKAWA Shinichi, SHIMIZU Ichiro, TAKEMOTO Yoshito, TADA Naoya

    2015   "OS0102 - 133-1"-"OS0102-133-2"   2015.11

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    In this study, biaxial compression tests along proportional and non-proportional strain paths were performed on binary titanium-niobium alloys (Ti-Nb alloys) of different niobium contents, in order to clarify the deformation behaviors of those alloys under biaxial loadings. The influences of strain path and niobium content upon the compressive deformation behavior were then investigated. It was found that there were differences on stress-strain relations of Ti-Nb alloys owing to the different primary plastic deformation mechanisms. The clear influence of strain path change on the compressive behavior of Ti-35Nb alloy was observed, probably because of the activation of new twin systems after the path change.

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  • G0300705 Study on Alloy Composition Dependent Constitutive Relation under Biaxial Compressions of Binary Titanium-Niobium Alloys

    SHIMIZU Ichiro, ISHIKAWA Shinichi, HISADA Kazuki, TADA Naoya, TAKEMOTO Yoshito

    Mechanical Engineering Congress, Japan   2015   "G0300705 - 1"-"G0300705-3"   2015.9

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    Titanium alloys with beta-stabilizing elements have excellent characteristics such as high specific strength, good plastic formability and good corrosion resistance. However, the deformation behaviors of those alloys under biaxial loadings are still not clarified. In this study, uniaxial and biaxial compression tests of binary titanium-niobium alloys (Ti-Nb alloys) of different niobium contents were performed. The influences of niobium contents upon the compressive deformation behavior were then investigated. It was found that the primary plastic deformation mechanism changed with the niobium content and with deformation pattern. As a consequence of that, the different type of anisotropic hardening appeared. The niobium content dependency of constitutive relation of Ti-Nb alloys was then discussed using equivalent stress variation based on an anisotropic yield function and plastic work.

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  • Productivity Improvement Technology of Hot Stamping

    55 ( 7 )   28 - 34   2014.7

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  • Influence of Alloy Composition upon Biaxial Compressive Deformation Behavior along Proportional Strain Path of Metastable p-Type Titanium-Niobium Alloys at Room Temperature

    HISADA Kazuki, SHIMIZU Ichiro, TAKEMOTO Yoshito, TADA Naoya

    Mechanical Engineering Congress, Japan   2013   "G031016 - 1"-"G031016-4"   2013.9

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    Metastable β-type titanium alloys have many features such as high specific strength, good ability of plastic deformation, excellent corrosion resistance, biocompatibility, and low Young's modulus, which are useful in aerospace, biomedical and chemical industries. However, plastic deformation behaviors of metastable β-type titanium alloys under multi-axial compressive conditions have not been clarified. In the present study, four types of Ti-Nb alloys, Ti-20mass%Nb, Ti-30mass%Nb, Ti-35mass%Nb, and Ti-45mass%Nb were prepared. The uniaxial and biaxial compression tests with proportional strain paths were then performed on Ti-Nb alloys by using a biaxial compression testing machine. The results of uniaxial compression tests revealed that stress induced martensite transformation, deformation twin, coarse slip occurred on Ti-20 and 30Nb, Ti-35Nb, and Ti-45Nb, respectively. It was found by biaxial compression tests that the plastic deformation behavior including anisotropic hardening also changes with Nb content.

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  • Investigation of Deformation Mechanism under Indentation Testing of Metastable Beta-type Reviewed

    Ichiro SHIMIZU, Noriaki KIMURA, Naoya TADA, Yoshito TAKEMOTO

    Proceedings of the 8th International Symposium on Advanced Science and Technology in Experimental Mechanics   No.62   2013

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  • A Fundamental Study on Plastic Deformation of Metastable Beta-Type Ti-Nb Alloys under Uniaxial and Biaxial Compressions Reviewed

    Ichiro Shimizu, Kazuaki Hisada, Naoya TADA, Yoshito TAKEMOTO

    Abstract Book of the International Conference on Experimental Mechanics 2013 & the 12th Asian Conference on Experimental Mechanics   48 - 48   2013

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  • Microstructural Control in Hot Stamping Processes for Producing Ultra-high Strength Automotive Steel Components

    17 ( 11 )   751 - 758   2012

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  • Study on Elastic Modulus Evaluation of Ti-Mo Alloy by Means of Indentation Test with Indenters of Various Shapes

    KOBATAKE Tetsuya, SHIMIZU Ichiro, TADA Naoya, KIMURA Noriaki, TAKEMOTO Yoshito

    60   135 - 136   2011

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  • Highly Efficient Hot Stamping Technology

    SENUMA Takehide, MAGOME Hideaki, HAGA Kazuhiro, FUJIOKA Takahiro, TAKEMOTO Yoshito, SHIMIZU Ken-ichi

    51 ( 594 )   680 - 684   2010.7

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  • Indentation Behavior of Grains of Ti-14Mo Alloy Deformed Mainly by Twin

    SHIMIZU Ichiro, KIMURA Noriaki, TADA Naoya, TAKEMOTO Yoshito

    59   257 - 258   2010

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  • Crystal Orientation Dependency of Indentation Geometry and Its Surrounding Deformation of Ti-Mo Alloys

    KIMURA Noriaki, SHIMIZU Ichiro, TADA Naoya, TAKEMOTO Yoshito, ISHIDA Takahisa

    58   359 - 360   2009

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  • 4-217 Trial for Encouragement of Mechanical Design Abilities on Experiment in Material Engineering

    SHIMIZU Kenichi, TAKEMOTO Yoshito, SHIMIZU Ichiro

    18   318 - 319   2006.7

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  • Evaluation of mechanical properties and formability of metastable beta-type Ti-Mo alloy Reviewed

    Y Takemoto, I Shimizu

    ADVANCES IN ENGINEERING PLASTICITY AND ITS APPLICATIONS, PTS 1 AND 2   274-276   373 - 378   2004

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    The changes in mechanical properties and formability of P-type Ti-Mo alloys with Mo content were investigated. Three types of Ti-Mo alloys, Ti-8mass%Mo, Ti-14mass%Mo and Ti-20mass%Mo were prepared, and a monotonic tensile test, a cyclic tensile test and a conical cup drawing test were conducted. It was found that Ti-Mo alloys are superior to Ti6Al4V in cold formability though inferior in tensile strength. Ti-14Mo was found to have excellent deep drawability as well as tensile ductility due to the twin formation. Ti-20Mo, of which the primary deformation mechanism is coarse slip, exhibited inferior tensile ductility but relatively high deep drawability. Ti-8Mo showed intermediate properties concerning cold formability, while it exhibited pseudo elastic type loading-unloading behavior, because of stress induced martensite transformation.

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  • Tensile Property of α" Martensite Structure in Ti-8mass%Mo Alloy Reviewed

    Ti-2003 Science and Technology   Vol.3, 1511-1518   2004

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  • Tensile Property and Deformation Structure at Elevated Temperatures in Ti-Mo Alloy Reviewed

    Proc. of the 3rd Int. Conf. Ad. Mater. Processing   pp.516-520   2004

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  • 713 Fe-3%Si薄板合金単結晶の応力 : 歪み曲線と転位組織の反応拡散方程式によるシミュレーション(結晶塑性,塑性挙動のモデリングとシミュレーション-ナノからマクロまで-,オーガナイスドセッション5,第53期学術講演会)

    飛田 守孝, 栗岡 宏幸, 榊原 精, 竹元 嘉利

    学術講演会講演論文集   53   463 - 464   2004

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  • Non-uniform tensile deformation and its dislocation structure in BCC single crystal (Mo, Fe-3%Si)

    Higuchi Takuya, Hida Moritaka, Takemoto Yoshito, Sakakibara Akira

    2003 ( 41 )   59 - 60   2003.2

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  • Non-uniform tensile deformation and its dislocation structure in Fe-3%Si single crystal

    MATSUOKA Tomoya, Hida Moritaka, Takemoto Yoshito, Sakakibara Akira

    2002 ( 40 )   59 - 60   2002.2

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  • Observation of Microscopic Deformation Behavior of Ti-6Al-4V in Tensile Test

    MIKI Tomohiro, SHIMIZU Ichiro, ABE Takeji, TAKEMOTO Yoshito

    2002 ( 40 )   51 - 52   2002.2

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  • Influence of Atomization Gas on Coating Properties under Arc Spraying Reviewed

    Proc. of Int. Conf. on Designing of Interfacial Structures in Advanced Materials and their Joints   pp.781-786   2002

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  • Influence of Atomization Gas on Nitriding Process under Ti Arc Spraying Reviewed

    SAKODA N.

    Proc. of Int. Thermal Spray Conf.   pp.1042-1046   1042 - 1046   2002

  • Influence of atomization gas on coating properties under Ti arc spraying Reviewed

    SAKODA N.

    Materials Science & Engineering A   342-1 ( 2 )   265 - 270   2002

  • 214 Unaxial Non-Uniform Deformation of Fe-3%Si alloy Single thin Crystal : Experiment and FEM Simulation

    HIDA Moritaka, TOKUDA Akihisa, SAKAKIBARA Akira, TAKEMOTO Yoshito

    2001 ( 39 )   67 - 68   2001.2

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  • 204 Surface Coating Treatment by Shot-blasting Technology

    SAKODA Nobuaki, HIDA Moritaka, SAKAKIBARA Akira, TAKEMOTO Yoshito, TSUYUNASHI Masao

    2001 ( 39 )   47 - 48   2001.2

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  • Inverse transformation of alpha ''-&gt;beta in Ti-40mass%Nb alloy Reviewed

    Y Mantani, Y Takemoto, M Hida, A Sakakibara

    PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II   pp.2643-2646   2643 - 2646   2001

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    In Ti-40mass%Nb alloy quenched from beta phase region, alpha"(orthorhombic) martensite is formed within the beta phase matrix. The a" martensite formed by quenching disappeared by isothermal aging at 623K for 15min, and transformed inversely into beta phase. Change of the structure in quenched specimen and aged one has been investigated by optical microscopy, X-ray diffraction and electron microscopy. Surface relief of alpha" martensite in quenched state was recognized by optical microscope, but could not be recognized after aging. Result of X-ray diffraction indicated that diffraction peaks of alpha" martensite disappeared by aging, and peak intensity of beta phase increased instead. Acicular martensites was observed by SEM and TEM in the quenched state, and many dislocations were observed in the aged state. Tensile tests were performed in quenched specimen and aged one to observe the change of stress-strain curves. The easiness of transformation between alpha" martensite and beta phase is discussed from the microscopic viewpoint.

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  • Strain analysis around defect using scanning HOLZ pattern Reviewed

    Y Takemoto, M Nagae, K Otsuka, M Hida, A Sakakibara

    PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II   pp.2451-2454   2451 - 2454   2001

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    New method for analysis of strain field around defect in metals by scanning HOLZ pattern using conventional TEM was proposed. It was able to detect the inclination of lattice plane in the precision of 0.01degrees and to express the figure of strain in the large area. This method was applied to TiN precipitation and dislocation in Molybdenum. Configuration of strain around precipitates varied in their shapes. The plate-shaped precipitate yields symmetric valley like strain, the rod-shaped one generates asymmetric mountain type, and the spherical one hardly raises strain to the matrix. The difference was related to the coherency between precipitates and matrix. There were two kinds of strain field types around dislocations. One was the type of the lattice plane bended by a dislocation, and another was the type showing a spiral vector map around a dislocation. This technique is very simple and is greatly applicable to material research.

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  • TEM observation of the α"→β inverse transformation in Ti-40mass%Nb alloy Reviewed

    Proc. of 7th Int. Sympo. on Advanced Physical Fields   pp.257-260   2001

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  • TEM observation of the α"→β inverse transformation in Ti-40mass%Nb alloy (日本電子顕微鏡学会第46回シンポジウム 材料のナノ・生物のナノ) -- (ポスターセッション "7th International Symposium on Advanced physical Fields(APF-7)"との合同セッション)

    Mantani Yoshikazu, Takemoto Yoshito, Hida Moritaka

    電子顕微鏡   36   238 - 241   2001

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  • Simulation of Deformation of Ni Twinned Nanccrystal Model by Moleculas Dynamics

    Memo.of the Fac.of Eng.,Okayama Univ.   33 ( 2 )   1 - 8   1999

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  • Transitional Structure, α"and w, at Interface of Deformation Twins for Structural Relaxation in Ti-Mo Alloys

    ADVANCED MATERIALS-4 Proc. of the Special Symposium on Advenced Materials   413   1998

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  • Microstructure of Oxide Layers Formed on Magnesium Surface at Elevated Temperature

    Memo. Fac. Eng. Okayama Univ.   31 ( 2 )   1 - 10   1997

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  • Solid solubility in nanocrystalline Ti/Mg and Mg/Ti composites powder produced by mechanical alloying Reviewed

    M Hida, K Asai, Y Takemoto, A Sakakibara

    SYNTHESIS AND PROPERTIES OF MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS, PTS 1 AND 2 - ISMANAM-96   235-2   187 - 192   1997

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    Mechanical alloying(MA) was examined by ball-milling the mixed starting powder of various composition, Ti-10, 20, 30, 40, 50, 60, 70, 80, 95at%Mg plus 2mass%NaCl powder. NaCl powder was an excellent anti-sticking agent for MA. The process of MA was mainly followed by X-ray diffraction method. Super-saturated quasi solid solution was formed for the samples up to 60at%Mg. The single hcp structure was newly created up to 30at%Mg samples, and over this composition range hcp peaks were combined to the diffraction pattern which will lead to bce like nano-crystallite. In Mg rich side, Ti-70 similar to 95at% MA samples showed the coexistence of hcp phases, Ti-based and Mg-based dilute solid solution. The solubility was estimated from the change of lattice constant. But it was somewhat difficult to detect the alloying effect of MA on Mg and Ti in Ti-95at%Mg sample. MA samples, Ti-20 and -50at%Mg, showed the starting of phase separation due to one hour annealing at 673 and 473K, respectively.

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  • Internal Structure and Phase Trasformation of Ti-V Alloy Fine Particles

    Memo. Faculty of Eng. , Okayama Univ.   31 ( 2 )   11 - 20   1997

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  • Nitriding Behavior of Mo-Ti Alloys in NH_3 at 1373K

    Proc. of the 14th International Plansee Seminar   1   819   1997

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  • Nature of Brittle Fracture in Aged Ti-Mo Alloy

    Memoirs of the Faculty of Engineering, Okayama Unviersity   1996

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  • X-Ray Topographic Observation of Strain Generated by Thin Film (TiN) on Silicon Surface

    Kusumoto Hisao, Hida Moritaka, Sakakibara Akira, Nishida Norihide, Takemoto Yoshito, Yamada Masuo

    Memoirs of the Faculty of Engineering, Okayama University   28 ( 2 )   13 - 20   1994

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    Other Link: http://ousar.lib.okayama-u.ac.jp/15453

  • An experimental study of nonuniform and localized deformation in Ti-50.6at.pct Ni shape memory alloy Reviewed

    XP JIANG, M HIDA, A SAKAKIBARA, Y TAKEMOTO, ZY SONG

    SHAPE MEMORY MATERIALS '94   191 - 195   1994

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  • Intornal Structure and Phase Trasformation of Ti-Mo Alloy Fine Particles

    Memo. Faculty of Eng. , Okayama Univ.   28 ( 2 )   1 - 7   1994

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  • MECHANOCHEMICAL REACTION IN VARIOUS SYSTEMS INVOLVING IONIC AND HYDROGEN-BOND CRYSTALS

    M HIDA, WY LIM, A SAKAKIBARA, Y TAKEMOTO, S FUJIMOTO

    MECHANICAL ALLOYING   88 ( 90 )   729 - 735   1992

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  • Mechanical Characteristics of Cast Ti Fiber-Reinforced Mg Composite

    Okada Hiroyuki, Hida Moritaka, Sakakibara Akira, Takemoto Yoshito

    Memoirs of the Faculty of Engineering, Okayama University   25 ( 2 )   1 - 8   1991

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  • Fine Particles of Ti and Ti-Mo Alloy Prepared by Gas Evaporation

    Umemoto Masayuki, Takemoto Yoshito, Sakakibara Akira, Hida Moritaka

    Memoirs of the Faculty of Engineering, Okayama Univ.   24 ( 2 )   1 - 9   1990

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    Language:English   Publisher:Faculty of Engineering, Okayama University  

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    Other Link: http://ousar.lib.okayama-u.ac.jp/15489

  • Depth Dependency of Hardness Change of Ti-Mo Alloys.

    Takemoto Yoshito, Hida Moritaka

    Mimoirs of the School of Engineering, Okayama University   21 ( 2 )   1 - 7   1987

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    Language:Japanese   Publisher:岡山大学工学部  

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Presentations

  • Ti-20Nb-xAl合金の焼入れα”マルテンサイト組織に及ぼすAl添加の影響

    万谷 義和, 伊藤 綾香, 竹元 嘉利

    日本金属学会第173回秋期講演大会  2023.9.20 

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    Event date: 2023.9.19 - 2023.9.26

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  • Ti-10V-2Fe-3Al合金の形状進展メカニズムと熱処理に伴う靭性回復

    四宮大輝, 横田啓人, 竹元嘉利

    日本金属学会中国四国支部第63回講演大会  2023.8.9 

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    Event date: 2023.8.9

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  • Ti-15V-7Al合金のβ母相における 縞状組織の解析

    森田洸希, 野島康平, 石原大暉, 竹元嘉利

    日本金属学会中国四国支部第63回講演大会  2023.8.9 

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    Event date: 2023.8.9

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  • Ti-20Nb合金の600℃焼戻しに伴う相変態挙動

    目﨑 雄大, 竹元 嘉利, 清水 一郎

    日本金属学会中国四国支部第52回若手フォーラム  2023.2.18 

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    Event date: 2023.2.18

    Language:Japanese  

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  • Ti-10Mo合金の熱処理による微細α相の析出形態と機械的性質

    津呂 政孝, 竹元 嘉利, 清水 一郎

    日本金属学会中国四国支部第52回若手フォーラム  2023.2.18 

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    Event date: 2023.2.18

    Language:Japanese  

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  • Ti-15V-7Al合金における加工誘起マルテンサイトバリアントの選択性

    小佐見 和志, 竹元 嘉利

    日本金属学会中国四国支部第52回若手フォーラム  2023.2.18 

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    Event date: 2023.2.18

    Language:Japanese  

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  • Ti-10V-2Fe-3Al合金の熱処理に伴う電気抵抗および構造変化

    竹内 雄大, 竹元 嘉利

    日本金属学会中国四国支部第52回若手フォーラム  2023.2.18 

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    Event date: 2023.2.18

    Language:Japanese  

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  • Ti-10V-2Fe-3Al合金の熱処理による特異な組織変化

    上田 明日翔, 竹元 嘉利

    日本金属学会中国四国支部第52回若手フォーラム  2023.2.18 

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    Event date: 2023.2.18

    Language:Japanese  

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  • Ti-10Mo-7Al合金におけるβ逆変態と時効挙動

    戸嶌悠策, 岸本龍矢, 竹元嘉利

    日本金属学会中国四国支部第51回若手フォーラム  2022.12.13 

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    Event date: 2022.12.13

    Language:Japanese  

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  • Ti-10Moにおける微細α相の熱処理による析出形態と機械特性

    津呂政孝, 竹元嘉利, 清水一郎

    日本金属学会中国四国支部第51回若手フォーラム  2022.12.13 

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    Event date: 2022.12.13

    Language:Japanese  

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  • 加工および焼戻し誘起α"マルテンサイト Invited

    竹元嘉利

    日本金属学会中国四国支部第137回 金属物性研究会  2022.12.8  日本金属学会,日本鉄鋼協会,軽金属学会中国四国支部

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    Event date: 2022.12.8

    Venue:松山  

  • 加工および焼戻し誘起α"マルテンサイト Invited

    竹元嘉利

    日本金属学会中国四国支部第137回 金属物性研究会  2022.12.8 

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    Event date: 2022.12.8

    Presentation type:Oral presentation (invited, special)  

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  • Ti-15V-7Al合金の加工誘起マルテンサイトバリアントの選択性

    小佐見和志, 竹元嘉利

    軽金属学会中国四国支部第14回講演大会  2022.10.22  軽金属学会中国四国支部

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    Event date: 2022.10.22

    Venue:新居浜  

  • Ti-10Moにおける微細α相の析出形態と機械特性

    津呂政孝, 竹元嘉利, 清水一郎

    軽金属学会中国四国支部第14回講演大会  2022.10.22  軽金属学会中国四国支部

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    Event date: 2022.10.22

    Venue:新居浜  

  • Ti-15V-7Al合金の加工誘起マルテンサイトバリアントの選択性

    小佐見和志, 竹元嘉利

    軽金属学会中国四国支部第14回講演大会  2022.10.22 

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    Event date: 2022.10.22

    Presentation type:Oral presentation (general)  

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  • Ti-10Moにおける微細α相の析出形態と機械特性

    津呂政孝, 竹元嘉利, 清水一郎

    軽金属学会中国四国支部第14回講演大会  2022.10.22 

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    Event date: 2022.10.22

    Presentation type:Oral presentation (general)  

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  • スピノーダル分解によるガラス基板上への TiO2-VO2 多層膜の形成

    村岡祐治 ,竹田一匡 ,脇田高徳 ,横谷尚睦 竹元嘉利

    2022年 第83回応用物理学会秋春季学術講演会  2022.9  応用物理学会

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    Event date: 2022.9.20 - 2022.9.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

  • スピノーダル分解によるガラス基板上への TiO2-VO2 多層膜の形成

    村岡祐治, 竹田一匡, 脇田高徳, 横谷尚睦, 竹元嘉利

    2022年 第83回応用物理学会秋春季学術講演会  2022.9 

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    Event date: 2022.9.20 - 2022.9.23

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  • Ti-10Mo-7Al合金におけるβ逆変態挙動

    戸嶌悠策,岸本龍矢,竹元嘉利

    日本金属学会中国四国支部第62回講演大会  2022.8.23  日本金属学会中国四国支部

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    Event date: 2022.8.23 - 2022.8.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

  • Ti-10V-2Fe-3Al合金の熱処理に伴う電気抵抗および構造変化

    竹内雄大,四宮大輝,岸本龍矢,上田明日翔,竹元嘉利

    日本金属学会中国四国支部第62回講演大会  2022.8.23  日本金属学会中国四国支部

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    Event date: 2022.8.23 - 2022.8.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

  • Ti-10V-2Fe-3Al合金の熱処理に伴う電気抵抗および構造変化

    竹内雄大, 四宮大輝, 岸本龍矢, 上田明日翔, 竹元嘉利

    日本金属学会中国四国支部第62回講演大  2022.8.23 

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    Event date: 2022.8.23

    Presentation type:Oral presentation (general)  

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  • ガラス基板上における TiO2-VO2 系スピノーダル分解膜の形成

    村岡祐治 ,竹田一匡 ,脇田高徳 ,横谷尚睦, 竹元嘉利

    2022年度応用物理・物理系学会中国四国支部支部合同学術講演会  2022.7.30  応用物理・物理系学会中国四国支部

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    Event date: 2022.7.30

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川  

  • ガラス基板上における TiO2-VO2 系スピノーダル分解膜の形成

    村岡祐治, 竹田一匡, 脇田高徳, 横谷尚睦, 竹元嘉利

    2022年度応用物理・物理系学会中国四国支部支部合同学術講演会  2022.7.30 

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    Event date: 2022.7.30

    Presentation type:Oral presentation (general)  

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  • Ti-15V-7Al合金のβ母相に現れる木目調組織の解析

    森田洸希,小佐見和志,岸本龍矢,竹元嘉利

    第50回「若手フォーラム」  2022.2.19  日本金属学会,日本鉄鋼協会,軽金属学会中国四国支部

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    Event date: 2022.2.19

    Venue:岡山  

  • Ti-20Nb合金の550℃時効硬化挙動に及ぼす組織変化の影響

    尾形陸斗,目崎雄大,竹元嘉利,清水一郎

    第50回「若手フォーラム」  2022.2.19  日本金属学会,日本鉄鋼協会,軽金属学会中国四国支部

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    Event date: 2022.2.19

    Venue:岡山  

  • Ti-10V-2Fe-3Al合金の焼戻しに伴う変態挙動

    四宮大輝,上田明日翔,竹元嘉利

    第50回「若手フォーラム」  2022.2.19  日本金属学会,日本鉄鋼協会,軽金属学会中国四国支部

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    Event date: 2022.2.19

    Venue:岡山  

  • レーザー付加製造されたTi-6Al-4V合金板材の微細組織と熱処理に伴う機械的性質の変化

    中野政秀,岸本龍矢,篠永東吾,岡本康寛,竹元嘉利

    第50回「若手フォーラム」  2022.2.19  日本金属学会,日本鉄鋼協会,軽金属学会中国四国支部

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    Event date: 2022.2.19

    Venue:岡山  

  • Ti-15V-7Al合金のβ母相に現れる木目調組織の解析

    森田洸希, 小佐見和志, 岸本龍矢, 竹元嘉利

    第50回「若手フォーラム」  2022.2.19 

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    Event date: 2022.2.19

    Presentation type:Poster presentation  

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  • Ti-20Nb合金の550℃時効硬化挙動に及ぼす組織変化の影響

    尾形陸斗, 目崎雄大, 竹元嘉利, 清水一郎

    第50回「若手フォーラム」  2022.2.19 

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    Event date: 2022.2.19

    Language:Japanese   Presentation type:Poster presentation  

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  • レーザー付加製造されたTi-6Al-4V合金板材の微細組織と熱処理に伴う機械的性質の変化

    中野政秀, 岸本龍矢, 篠永東吾, 岡本康寛, 竹元嘉利

    第50回「若手フォーラム」  2022.2.19 

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    Event date: 2022.2.19

    Presentation type:Poster presentation  

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  • Ti-10V-2Fe-3Al合金の焼戻しに伴う変態挙動

    四宮大輝, 上田明日翔, 竹元嘉利

    第50回「若手フォーラム」  2022.2.19 

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    Event date: 2022.2.19

    Presentation type:Poster presentation  

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  • チタン合金の熱処理に伴うマルテンサイトの様相 Invited

    竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1 

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    Event date: 2022.2.1

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  • Ti-20Nb 合金の焼戻しに伴う相変態挙動

    目崎雄大, 尾形陸斗, 竹元嘉利, 清水一郎

    軽金属学会70周年中国四国支部記念事業  2022.2.1 

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    Event date: 2022.2.1

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  • Ti-10V-2Fe-3Al 合金の熱処理に伴うマルテンサイト変態挙動

    上田明日翔, 四宮大輝, 竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1 

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    Event date: 2022.2.1

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  • レーザー付加造形法 Ti-6Al-4V 合金における微細組織と溶接した板材の機械特性

    岸本龍矢, 中野政秀, 岡本康寛, 篠永東吾, 竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1 

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    Event date: 2022.2.1

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  • Ti-10Mo 合金における微細 α 相の形成と機械特性

    津呂政孝, 竹元嘉利, 清水一郎

    軽金属学会70周年中国四国支部記念事業  2022.2.1 

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    Event date: 2022.2.1

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  • チタン合金の熱処理に伴うマルテンサイトの様相 Invited

    竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1  軽金属学会中国四国支部

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    Event date: 2022.2.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:広島(オンライン)  

  • レーザー付加造形法 Ti-6Al-4V 合金における微細組織と溶接した板材の機械特性 Invited

    岸本龍矢,中野政秀,岡本康寛,篠永東吾,竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1  軽金属学会中国四国支部

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    Event date: 2022.2.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島(オンライン)  

  • Ti-10Mo 合金における微細 α 相の形成と機械特性 Invited

    津呂政孝,竹元嘉利 .清水一郎

    軽金属学会70周年中国四国支部記念事業  2022.2.1  軽金属学会中国四国支部

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    Event date: 2022.2.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島(オンライン)  

  • Ti-20Nb 合金の焼戻しに伴う相変態挙動 Invited

    目崎雄大,尾形陸斗,竹元嘉利 .清水一郎

    軽金属学会70周年中国四国支部記念事業  2022.2.1  軽金属学会中国四国支部

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    Event date: 2022.2.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島(オンライン)  

  • Ti-10V-2Fe-3Al 合金の熱処理に伴うマルテンサイト変態挙動 Invited

    上田明日翔,四宮大輝,竹元嘉利

    軽金属学会70周年中国四国支部記念事業  2022.2.1  軽金属学会中国四国支部

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    Event date: 2022.2.1

    Language:Japanese   Presentation type:Poster presentation  

    Venue:広島(オンライン)  

  • Change in Uniaxial and Biaxial Compressive Behavior with Alloy Composition of Metastable β-Type Titanium 10-18 mass% Molybdenum Alloy International conference

    Ichiro Shimizu and Yoshito Takemoto

    The 16th International Symposium on Advanced Science and Technology in Experimental Mechanics   2021.11.5 

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    Event date: 2021.11.3 - 2021.11.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Viet Nam  

  • Ti-15V-7Al合金の加工と熱処理によるマルテンサイトの形成と消滅

    小佐見和志, 竹元嘉利

    第13回 軽金属学会中国四国支部講演大会  2021.10.9 

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    Event date: 2021.10.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Tempering-induced Martensite in Ti-10Mo-7Al Alloy

    2021.9.17 

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    Event date: 2021.9.14 - 2021.9.17

    Presentation type:Oral presentation (general)  

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  • ルチル型TiO2-RuO2膜のスピノーダル分解

    村岡祐治, 河原拓海 , 脇田高徳, 横谷尚睦 , 竹元 嘉利

    第82回応用物理学会秋季学術講演会  2021.9.12 

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    Event date: 2021.9.10 - 2021.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-10Mo-7Al合金の熱処理に伴う電気抵抗変化と微細組織

    上村功貴,竹元嘉利

    日本金属学会中国四国支部第61回講演大会  2021.8.24  日本金属学会中国四国支部

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    Event date: 2021.8.24 - 2021.8.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口(オンライン)  

  • Ti-10Mo-7Al合金における微細α相の形態と機械特性

    宮崎翔太郎,竹元嘉利

    日本金属学会中国四国支部第61回講演大会  2021.8.24  日本金属学会中国四国支部

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    Event date: 2021.8.24 - 2021.8.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口(オンライン)  

  • Ti-10Mo-7Al合金における微細α相の形態と機械特性

    宮崎翔太郎, 竹元嘉利

    日本金属学会 第61回中国四国支部講演大会  2021.8.24 

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    Event date: 2021.8.24

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  • Ti0.2V0.8O2/TiO2(100)におけるスピノーダル分解

    村岡祐治,福田貴優,脇田高徳,横谷尚睦,杉立真太郎,宮崎翔太郎,竹元嘉利

    第68回応用物理学会春季学術講演会  2021.3.19 

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    Event date: 2021.3.16 - 2021.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スピノーダル分解を用いたTiO2-VO2系ナノ構造膜の形成

    村岡祐治,脇田高徳,横谷尚睦,竹元嘉利

    第30回日本MRS年次大会  日本MRS

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    Event date: 2020.12.10

    Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

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  • β型チタン合金の予想できない変態挙動

    竹元嘉利

    第136回 金属物性研究会  日本金属学会中国四国支部

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    Event date: 2020.12.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

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  • Ti 10Mo 7Al 合金の特異なマルテンサイト変態挙動 Invited

    竹元嘉利

    第4回ASMA Webセミナー  形状記憶合金協会

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    Event date: 2020.11.25

    Presentation type:Oral presentation (invited, special)  

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  • スピノーダル分解したTiO2-VO2系膜における格子歪とラメラ周期の関係

    村岡祐治、福田貴優、脇田高徳、横谷尚睦、竹元嘉利

    第81回応用物理学会 秋季学術講演会 

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    Event date: 2020.9.9

    Presentation type:Oral presentation (general)  

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  • Ti-10Mo-7Al合金の異常なマルテンサイト変態挙動と生成条件

    池本雅基,安野実希子,安藤寛幸,竹元嘉利

    日本金属学会第60回中国四国支部講演大会 

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    Event date: 2020.8.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-10Mo-7Al合金の機械的性質および組織に及ぼす熱処理の影響

    杉立真太郎,工藤彩音,竹元嘉利

    日本金属学会第60回中国四国支部講演大会 

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    Event date: 2020.8.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-NbおよびTi-Nb-Al合金における加工誘起変態の熱分析による検討

    万谷 義和,山本 莉那,竹元 嘉利

    日本金属学会第166回春期講演大会  日本金属学会

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    Event date: 2020.3.18

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • β型Ti合金のマルテンサイト変態に及ぼす熱応力の影響

    安藤寛幸,竹元嘉利

    日本金属学会中国四国支部第47回若手フォーラム  日本金属学会中国四国支部

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    Event date: 2020.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-10Mo-7Al合金の引張特性に及ぼす熱処理の影響

    工藤彩音,竹元嘉利,大宮祐也

    日本金属学会中国四国支部第47回若手フォーラム  日本金属学会中国四国支部

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    Event date: 2020.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-42Nb合金のサブゼロ処理における表層と内部の電気抵抗測定

    上村功貴,竹元嘉利

    日本金属学会中国四国支部第47回若手フォーラム  日本金属学会中国四国支部

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    Event date: 2020.2.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-8Mo合金のスピノーダル分解とα相生成

    鈴木雄基,竹元嘉利

    日本金属学会中国四国支部第133回金属物性研究会  日本金属学会中国四国支部

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    Event date: 2019.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市  

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  • Ti-10Mo-7Al合金の短時間焼戻しで生じるマルテンサイト変態

    安野実希子,池本雅基,竹元嘉利,宮崎翔太郎

    第45回若手フォーラム  日本金属学会・日本鉄鋼協会中国四国支部、軽金属学会中国四国支部

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    Event date: 2019.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-15V-7Al合金の時効硬化に及ぼす焼戻し温度の影響

    真部侑司,安野実希子,竹元嘉利

    第45回若手フォーラム  日本金属学会・日本鉄鋼協会中国四国支部、軽金属学会中国四国支部

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    Event date: 2019.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-8Mo合金におけるマルテンサイトのスピノーダル分解

    鈴木雄基,安野美希子,竹元嘉利

    第45回若手フォーラム  日本金属学会・日本鉄鋼協会中国四国支部、軽金属学会中国四国支部

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    Event date: 2019.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-35Nb合金の焼戻しにおける相変態の評価

    津田弘基,池本雅基,安野実希子,竹元嘉利

    第45回若手フォーラム  日本金属学会・日本鉄鋼協会中国四国支部、軽金属学会中国四国支部

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    Event date: 2019.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • チタン合金の基礎と応用 Invited

    竹元嘉利

    日本機械学会中国四国支部 第131回講習会  日本機械学会中国四国支部

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    Event date: 2019.11.25

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:岡山市  

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  • Effect of Al addition on Tensile Deformation Property of Ti-18Nb-xAl Alloys

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    Event date: 2019.9.11 - 2019.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-X-7Alの特異現象と相変態挙動

    竹元 嘉利

    日本鉄鋼協会2019年秋季大会  日本鉄鋼協会

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    Event date: 2019.9.11 - 2019.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Measurement of electrical resistance on martensite transformation with subzero treatment of Fe-32Ni

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    Event date: 2019.9.11 - 2019.9.13

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-10Mo-7Alの 熱処理に伴う電気抵抗変化

    板野壮志, 竹元嘉利

    日本鉄鋼協会第178回秋季講演大会  日本鉄鋼協会

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    Event date: 2019.9.11 - 2019.9.13

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • Evaluation of phase transformation of Ti-35 Nb alloy by various measurements

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    Event date: 2019.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-10Mo-7Al合金における短時間焼戻しで生じるマルテンサイト変態

    安野 実希子、池本 雅基、宮崎 翔太郎、竹元嘉利

    軽金属学会第11回中国四国支部講演大会  軽金属学会中国四国支部

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    Event date: 2019.8.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山理科大  

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  • Ti-15V-7Al合金の焼戻し組織変化に及ぼす焼戻し温度の影響

    真部 侑司、安野 実希子、竹元嘉利

    軽金属学会第11回中国四国支部講演大会  軽金属学会中国四国支部

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    Event date: 2019.8.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山理科大  

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  • Ti-8Mo合金におけるスピノーダル分解挙動

    鈴木雄基、安野 実希子、竹元嘉利

    軽金属学会第11回中国四国支部講演大会  軽金属学会中国四国支部

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    Event date: 2019.8.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山理科大  

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  • Ti-25Nb-7Al合金の引張特性に及ぼす熱処理の影響

    池本雅基、元吉達也,竹元嘉利

    第44回若手フォーラム  日本金属学会

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    Event date: 2019.2.16

    Presentation type:Poster presentation  

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  • Ti-35Nb合金の熱処理に伴う微細組織と電気抵抗変化

    津田弘基、安野実希子,竹元嘉利

    第44回若手フォーラム  日本金属学会

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    Event date: 2019.2.16

    Presentation type:Poster presentation  

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  • Fe-28Ni合金のマルテンサイト変態における電気抵抗測定

    大西春道、板野壮志,竹元嘉利

    第44回若手フォーラム  日本金属学会

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    Event date: 2019.2.16

    Presentation type:Poster presentation  

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  • Ti-23Nb-7Al合金の引張特性に及ぼす温度の影響

    杉立真太郎、安野実希子,竹元嘉利

    第44回若手フォーラム  日本金属学会

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    Event date: 2019.2.16

    Presentation type:Poster presentation  

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  • 新規β型Ti合金の特異なマルテンサイト変態

    竹元嘉利

    第65回材質制御研究会  日本

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    Event date: 2019.2.7

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:鳥取  

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  • 二元系準安定β型チタン合金の二軸圧縮挙動における変形双晶の役割に関する基礎的考察

    清水一郎、竹元嘉利

    応力・ひずみ測定と強度評価シンポジウム  日本非破壊検査協会

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    Event date: 2019.1.11 - 2019.1.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • Ti-10Mo-7Alのサブゼロ処理と短時間焼戻しによるマルテンサイト変態

    荒木 稜,竹元嘉利

    軽金属学会中国四国支部第41回若手フォーラム  軽金属学会中国四国支部

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    Event date: 2018.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:高松  

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  • Ti-25Nb-7Al合金における焼入れ組織と機械特性に及ぼす溶体化温度の影響

    元吉達也,安野実希子,竹元嘉利

    日本金属学会中国四国支部第41回若手フォーラム 

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    Event date: 2018.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-18Nb-xAl合金における焼入れマルテンサイト組織と材料特性に及ぼす温度の影響

    万谷義和,佐田幸葉,竹元嘉利

    日本金属学会秋期講演大会 

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    Event date: 2018.9.19 - 2018.9.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大  

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  • Temperature range of martensitic transformation induced by tempering of Ti-10Mo-7Al alloy

    Yoshito Takemoto, Ryou Araki

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    Event date: 2018.9.19 - 2018.9.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超高強度マルテンサイト鋼の機械的性質に及ぼす表面脱炭の影響

    桑田健太郎、竹元嘉利,瀬沼武秀

    日本鉄鋼協会第176回秋季講演大会 

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    Event date: 2018.9.19 - 2018.9.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東北大  

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  • Ti-25Nb-7Al合金における焼入れ組織と機械特性に及ぼす溶体化温度の影響

    元吉達也,安野実希子,竹元嘉利

    日本金属学会第58回中国四国支部講演大会 

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    Event date: 2018.8.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スピノーダル分解を用いたTiO2-VO2多層構造膜の作製

    村岡祐治,松浦由佳,真部侑司,鈴木雄基,荒木 稜,門脇賢司,竹元嘉利,寺嶋健成,脇田高徳,横谷 尚

    2018年度 応用物理・物理系学会 中国四国支部 合同学術講演会 

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    Event date: 2018.8.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-10Mo-7Alの短時間焼戻しによるマルテンサイト変態

    荒木 稜,竹元嘉利

    軽金属学会第10回中国四国支部講演大会  軽金属学会中国四国支部

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    Event date: 2018.7.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島工大  

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  • Ti-15V-7Alの低温と高温で形成されるマルテンサイト

    Yoshito Takemoto

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    Event date: 2018.6.28 - 2018.6.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • β型Ti合金のサブゼロと焼戻しで形成されるマルテンサイト

    Yoshito Takemoto

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    Event date: 2018.5.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • α+β型チタン合金の焼入れマルテンサイト組織と機械的性質に及ぼす合金元素の影響

    万谷義和、河俣美佑、小林明日香、竹元嘉利

    日本金属学会2018年春期大会 

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    Event date: 2018.3.19 - 2018.3.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Martensite transformation induced by cooling and heating on Ti-15V-7Al

    Yoshito Takemoto, Miyu Tsunekawa

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    Event date: 2018.3.19 - 2018.3.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-25Nb-7Al合金の焼戻しとサブゼロ処理で生じるマルテンサイト変態

    安野実希子,竹元嘉利

    第40回若手フォーラム  日本金属学会

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    Event date: 2018.2.17

    Presentation type:Poster presentation  

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  • β型Ti-X-7Al合金の熱処理に伴う電気抵抗率変化

    板野壮志,竹元嘉利

    第40回若手フォーラム  日本金属学会

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    Event date: 2018.2.17

    Presentation type:Poster presentation  

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  • Ti-15V-7Al合金の550℃焼戻しに伴うマルテンサイトの形成と消滅

    真部侑司,竹元嘉利

    第40回若手フォーラム  日本金属学会

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    Event date: 2018.2.17

    Presentation type:Poster presentation  

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  • TEM観察及びTEM試料作製におけるアーティファクトに関する研究

    鈴木雄基,竹元嘉利

    第40回若手フォーラム  日本金属学会

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    Event date: 2018.2.17

    Presentation type:Poster presentation  

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  • Ti-35Nb-xAlの時効硬化挙動と組織に及ぼすAlの影響

    田口洋助,竹元嘉利

    第38回若手フォーラム  日本金属学会

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    Event date: 2017.12.19

    Presentation type:Oral presentation (general)  

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  • Ti-15V-7Alの焼戻しで生じるマルテンサイト変態

    恒川弥佑,荒木 稜,竹元嘉利

    第37回若手フォーラム  日本金属学会

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    Event date: 2017.11.2

    Presentation type:Oral presentation (general)  

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  • A Study on the Relationship between Ratio of HCP Phase and Compressive Plastic Deformation Behavior of Binary Ti-Nb Alloys

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    Event date: 2017.10.7 - 2017.10.9

    Presentation type:Oral presentation (general)  

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  • Ti-X-7Alの焼戻しに伴うマルテンサイト的な変態と特異現象の発現

    竹元嘉利

    チタン・フォーラムシンポジウム 「チタン合金の相変態研究の新たな展開?」 

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    Event date: 2017.9.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • α+β型チタン合金の焼入れマルテンサイト組織と機械的性質に及ぼす合金元素の影響

    万谷義和, 河俣美佑, 小林明日香, 竹元嘉利

    日本金属学会第161回講演大会 

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    Event date: 2017.9.6 - 2017.9.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-8Cr-7Al合金の焼戻しに伴う硬さと組織変化

    門脇賢司, 竹元嘉利

    日本鉄鋼協会第174回秋季講演大会 

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    Event date: 2017.9.6 - 2017.9.8

    Language:Japanese   Presentation type:Poster presentation  

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  • サファイア基板上へのTiO2-VO2 系スピノーダル分解膜の作製

    村岡祐治,松浦由佳,門脇賢司,井尻正孝,竹元嘉利,寺嶋健成,脇田高徳,横谷尚睦

    第78回応用物理学会秋季学術講演会 

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    Event date: 2017.9.5 - 2017.9.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti合金における水素吸収特性に関する基礎的研究

    大垣亮人,松本琢磨,竹元嘉利

    日本実験力学会 2017年度年次講演会 

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    Event date: 2017.8.28 - 2017.8.30

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-15V-7Al合金の焼戻しに伴う組織変化

    恒川弥佑,荒木 稜,竹元嘉利

    日本実験力学会 2017年度年次講演会 

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    Event date: 2017.8.28 - 2017.8.30

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-xNb-7Alの引張特性に及ぼすNbの影響

    小野宏輝,竹元嘉利

    金属第57回 鉄鋼第60回 中国四国支部講演大会 

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    Event date: 2017.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-23Nb-7Al合金の焼戻しで生成する斜方晶構造に及ぼす溶体化温度の影響

    森 俊貴, 竹元嘉利

    金属第57回 鉄鋼第60回 中国四国支部講演大会 

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    Event date: 2017.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • TiO2-VO2系スピノーダル分解における速度論

    村岡祐治, 尾形 誠, 門脇賢司, 井尻政孝, 竹元嘉利, 寺嶋健成, 脇田高徳, 横谷尚睦

    応用物理・物理系学会 中国四国支部 合同学術講演会 

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    Event date: 2017.7.29 - 2017.7.30

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti合金の水素吸蔵特性に関する基礎研究

    松本琢磨, 竹元嘉利, 大垣亮人

    軽金属学会第9回中国四国支部講演大会 

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    Event date: 2017.7.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-35Nb-xAlの時効硬化挙動に及ぼすAlの影響

    田口洋助,竹元嘉利

    軽金属学会第9回中国四国支部講演大会 

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    Event date: 2017.7.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-15V合金の焼入れ組織に及ぼす溶体化処理条件の影響

    元吉達也,井尻政孝,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第36回「若手フォーラム」 

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    Event date: 2017.2.17

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti合金の水素吸蔵特性に関する基礎研究

    松本琢磨,井尻政孝,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第36回「若手フォーラム」 

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    Event date: 2017.2.17

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-10V-2Fe-3Al合金の時効挙動と微細組織に及ぼす溶体化処理温度の影響

    桑田健太郎,井尻政孝,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第36回「若手フォーラム」 

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    Event date: 2017.2.17

    Language:Japanese   Presentation type:Poster presentation  

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  • 焼入れTi-10Mo-7Al合金の表面から内部におけるマルテンサイト組織の変化

    荒木 稜,井尻政孝,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第36回「若手フォーラム」 

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    Event date: 2017.2.17

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-X-7Al合金の特異なマルテンサイト的変態

    竹元嘉利

    第127回金属物性研究会  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2017.1.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山」市  

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  • Ti-X-7Al合金の焼戻しによる特異現象の発現

    竹元嘉利

    第126回金属物性研究会  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2017.1.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Ti-42Nb合金の電気抵抗変化に及ぼす溶体化処理温度と測定部位の影響

    丸山拓也,竹元嘉利

    第35回「若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部、軽金属学会中国四国支部

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    Event date: 2016.12.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山市  

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  • Stress-Strain Behavior of Ti-Nb Alloys under Compressions along Linear Strain Paths and Bilinear Plane Strain Path International conference

    Ichiro SHIMIZU, Yoshito TAKEMOTO, Shinichi ISHIKAWA and Tomohiro KUMURA

    11th International Symposium on Advanced Science and Technology in Experimental Mechanics 

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    Event date: 2016.11.1 - 2016.11.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:ホーチミン  

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  • Ti-10Mo-7Al合金の溶体化塩浴焼入れによる微細組織

    山本崇義,井尻政孝,竹元嘉利

    第172回日本鉄鋼協会秋季講演大会 

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    Event date: 2016.9.21 - 2016.9.23

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-Nb合金焼入れマルテンサイト組織の制振特性に及ぼす温度と周波数の影響

    万谷義和, 平山貴紀, 竹元嘉利

    日本金属学会大159回秋期講演大会 

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    Event date: 2016.9.21 - 2016.9.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スピノーダル分解を用いたTiO2-VO2 系相分離膜の作製

    松浦由佳, 吉井文哉, 尾形誠, 門脇賢司, 井尻政孝, 寺嶋健成, 脇田高徳, 竹元嘉利, 横谷尚睦, 村岡祐治

    第77回応用物理学会秋季学術講演会 

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    Event date: 2016.9.13 - 2016.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-35Nb-7Al合金の時効硬化に及ぼす溶体化温度の影響

    井尻政孝,石川高史, 奥村輝,竹元嘉利

    日本鉄鋼協会第59回中国四国支部講演大会 

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    Event date: 2016.8.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effect of Nb in Ti-xNb-7Al Alloys on Microstructure and Tempering Behavior International conference

    Masataka Ijiri, Yuki Tomita, Takafumi Ishikawa, Yousuke Taguchi and Yoshito Takemoto

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 

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    Event date: 2016.8.1 - 2016.8.5

    Language:English   Presentation type:Poster presentation  

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  • Shape Change Behavior and Microstructure with Tempering of Ti-10Mo-7Al Alloy International conference

    Yoshito Takemoto, Masataka Ijiri and Tatsuya Tanaka

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 

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    Event date: 2016.8.1 - 2016.8.5

    Language:English   Presentation type:Poster presentation  

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  • Influence of Chemical Composistion and Microstructure on Mechanical Properties of Hot tamped Steel Parts International conference

    T. Kishimoto, Y. Takemoto, M. Okayasu, T. Senuma

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 

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    Event date: 2016.8.1 - 2016.8.5

    Language:English   Presentation type:Poster presentation  

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  • Effect of Stress Loading on Elastic Behavior of Quenched Ti-Nb Alloys International conference

    Yoshikazu Mantani and Yoshito Takemoto

    The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 

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    Event date: 2016.8.1 - 2016.8.5

    Language:English   Presentation type:Poster presentation  

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  • TiO2-VO2系エピタキシャル成長膜におけるスノーダ分解の基板方位依存性

    吉井文哉,松浦由佳,尾形誠,門脇賢司,井尻政孝,脇田高徳,寺嶋健成,竹元嘉利,横谷尚睦,村岡祐治

    2016年度応用物理・物理系学会 中国四国支部合同学術講演会 

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    Event date: 2016.7.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-42Nb合金の電気抵抗に及ぼす溶体化処理温度の影響

    丸山拓也,井尻政孝,竹元嘉利

    軽金属学会中国四国支部第8回講演大会 

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    Event date: 2016.7.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-xNb-7Al合金の時効硬化と微細組織におよぼすNb添加量の影響

    竹元嘉利,井尻政孝,石川高史,門脇賢司

    軽金属学会中国四国支部第8回講演大会 

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    Event date: 2016.7.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-4Fe-7Al合金の時効挙動と微細組織に及ぼす熱処理の影響

    井尻政孝,石川高史, 奥村輝,竹元嘉利

    軽金属学会中国四国支部第8回講演大会 

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    Event date: 2016.7.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Nb合金焼入れマルテンサイト組織の応力負荷・除荷に伴う構造変化

    万谷義和, 竹元嘉利

    日本金属学会2016年春期大会 

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    Event date: 2016.3.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-35Nb-7Al合金の焼戻しに伴う硬さと組織変化

    奥村輝,井尻政孝,竹元嘉利

    日本鉄鋼協会第171回春季講演大会 

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    Event date: 2016.3.24

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-10Mo-7Al合金の焼戻しに伴う自発変形

    竹元嘉利,井尻政孝,田中達也,門脇賢司

    日本鉄鋼協会第171回春季講演大会 

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    Event date: 2016.3.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 鋼中のNbCの水素のトラップ能力に及ぼす析出状態の影響

    岸本拓也,鬮橋翼,竹元嘉利,瀬沼武秀

    日本鉄鋼協会第171回春季講演大会 

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    Event date: 2016.3.24

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-35Nb-7Al合金の焼戻しに伴う相変態挙動

    井尻政孝,富田悠希,石川高史,竹元嘉利

    日本金属学会2016年春期大会 

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    Event date: 2016.3.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-42Nb合金の電気抵抗に及ぼす焼入れ温度の影響

    丸山拓也, 竹元 嘉利, 井尻政孝, 久保裕作

    日本金属学会・日本鉄鋼協会中国四国支部 第33回「若手フォーラム」 

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    Event date: 2016.2.19

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-X-7Al合金における微細組織に及ぼすTEM試料作製の影響

    大垣亮人, 竹元嘉利, 井尻政孝

    日本金属学会・日本鉄鋼協会中国四国支部 第33回「若手フォーラム」 

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    Event date: 2016.2.19

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-xNb-7Al合金の焼戻し組織に及ぼすNbの影響

    井尻政孝, 富田悠希, 竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第33回「若手フォーラム」 

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    Event date: 2016.2.19

    Language:Japanese   Presentation type:Poster presentation  

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  • ルチル型酸化物TiO2-VO2系のスピノーダル分解と異原子価(Al3+,Nb5+)ドープがスピノーダル分解の速さに及ぼす効果

    尾形 誠,村岡祐治,横谷尚睦,井尻政孝,門脇賢司,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部 第33回「若手フォーラム」 

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    Event date: 2016.2.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-35Nb-xAlの熱処理条件による組織組織の変化に及ぼすAlの影響

    田口洋助, 竹元嘉利, 井尻政孝, 富田悠希

    日本金属学会・日本鉄鋼協会中国四国支部 第33回「若手フォーラム」 

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    Event date: 2016.2.19

    Language:Japanese   Presentation type:Poster presentation  

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  • Change in structure and mechanical properties of Ti-10Mo-7Al by heat treatments International conference

    Masataka Ijiri and Yoshito Takemoto

    24th Int. Sympo. on Processing and Fabrication of Advanced Materials (PFAM XXIV) 

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    Event date: 2015.12.18 - 2015.12.20

    Language:English   Presentation type:Oral presentation (general)  

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  • 二軸圧縮下におけるTi-Nb合金の塑性変形挙動に及ぼすひずみ経路変化の影響

    石川慎一,清水一郎,竹元嘉利,多田直哉

    日本機械学会 M&M2015材料力学部門カンファレンス  日本機械学会

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    Event date: 2015.11.21 - 2015.11.23

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • β型チタン合金の相安定性と弾塑性変形挙動の変化

    万谷義和,竹元嘉利

    日本金属学会大157回秋期講演大会  日本金属学会

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    Event date: 2015.9.16 - 2015.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • Ti-xNb-7Al合金の焼戻しに伴う硬さと組織変化

    井尻政孝,竹元嘉利

    日本鉄鋼協会第170回秋季講演大会  日本鉄鋼協

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    Event date: 2015.9.16 - 2015.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 二元系Ti-Nb 合金における二軸圧縮時の合金組成依存型構成関係に関する検討

    清水一郎, 石川慎一, 久田一樹, 多田直哉, 竹元嘉利

    2015年度日本機械学会年次大会  日本機械学会

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    Event date: 2015.9.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • Ti-X-7Al合金における焼入れマルテンサイトの熱処理に伴う消滅

    井尻政孝,竹元嘉利

    日本金属学会第55回中国四国支部講演大会  日本金属学会中四国支部

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    Event date: 2015.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • Ti-10Mo-7Al合金の焼戻しにおける相変態挙動

    田中達也,井尻政孝,竹元嘉利

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-X-7Al合金の電気抵抗変化に及ぼす焼戻しの影響

    久保裕作,竹元嘉利,井尻政孝

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-35Nb-7Al合金の相変態挙動と機械的特性

    滝川 新,井尻政孝,竹元嘉利

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • DAT51の機械的性質に及ぼす熱処理の影響

    浜田大地,竹元嘉利

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-xNb-7Alの焼戻し挙動に及ぼすNb添加量の影響

    富田悠希,井尻政孝,竹元嘉利

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-4Fe-7Al合金の焼戻しに伴う耐食性の向上

    石川高史,井尻政孝,竹元嘉利,村上浩二

    第7回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2015.7.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 超高強度低合金TRIP鋼の耐水素脆化特性に及ぼす等温変態処理の影響

    菊池梨子,北條智彦,西村文仁,瀬沼武秀,竹元嘉利,杉本公一 杉

    日本材料学会第64期学術講演会 

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    Event date: 2015.5.22 - 2015.5.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Nb合金における焼入れマルテンサイトの変形に伴う結晶構造と材料特性の変化

    万谷義和、竹元嘉利

    日本金属学会2015年度春期講演大会  日本金属学会

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    Event date: 2015.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • β下限Ti-X-7Al合金の焼戻しによるマルテンサイト的変態

    竹元嘉利、井尻政孝、瀬沼武秀

    日本鉄鋼協会,材料の組織と特性部会「チタン合金の相変態・析出研究の新展開」シンポジウム  日本鉄鋼協会

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    Event date: 2015.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • Ti-10Mo-7AlとTi-35Nb-7Al合金の熱処理に伴う相変態挙動

    井尻政孝、竹元嘉利、瀬沼武秀

    日本金属学会2015年度春期講演大会  日本金属学会

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    Event date: 2015.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 高温二相域で溶体化処理したTi-5Al-2Fe-3Moの時効処理時に発現するベイナイト的変態挙動

    國枝知徳、高橋一浩、藤井秀樹、竹元嘉利

    日本鉄鋼協会,材料の組織と特性部会「チタン合金の相変態・析出研究の新展開」シンポジウム  日本鉄鋼協会

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    Event date: 2015.3.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • DAT51の組織と機械的性質に及ぼす熱処理の影響

    浜田大地,井尻政孝,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • 水素脆化に及ぼすNbCの析出状態の影響

    クジハシ ツバサ,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • 極低炭素鋼の水素脆化挙動に及ぼすTi, Nbの添加量と粒径の影響

    内藤龍,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-4Fe-5Al合金の機械的特性と焼戻しに伴う組織と構造変化

    奥村輝,永久裕一,井尻政孝,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

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  • Ti-4Fe-7Al合金の耐食実験

    石川高史,井尻政孝,竹元嘉利,瀬沼武秀,村上浩二

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-Nb合金の二軸圧縮における塑性挙動に及ぼすひずみ経路の影響

    石川慎一,清水一郎,久田一樹,竹元嘉利,多田直哉

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • ホットスタンピング部材の機械的性質に及ぼすNb,V,Mo,Tiの影響

    岸本拓也,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • 特異な形状変化を持つ新しいβ型チタン合金の開発とその現象の解明

    井尻政孝,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • β型チタン合金のヤング率に及ぼす諸因子の影響

    山本崇義,井尻政孝,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第31回若手フォーラム」 

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    Event date: 2015.2.20

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-10Mo-7AlとTi-35Nb-7Alの特異現象と引張特性 International conference

    藤岡 渉,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会,第30回若手フォーラム 

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    Event date: 2014.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-5Al-2Fe-3Mo合金の加工と焼戻しで形成されるα”の構造

    朝倉 健太,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会,第30回若手フォーラム 

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    Event date: 2014.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Alloy Composition Dependency of Plastic Deformation Behavior in Biaxial Compressions of Ti-Nb Alloys International conference

    Ichiro Shimizu, Kazuki Hisada, Shinichi Ishikawa, Yoshito Takemoto, Naoya Tada

    The International Conference on Experimental Mechanics 

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    Event date: 2014.11.15 - 2014.11.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Singapore  

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  • Ti-X-7Al合金の焼戻しに伴う特異現象

    井尻政孝,竹元嘉利

    日本チタン協会第2回チタン若手交流会 

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    Event date: 2014.11.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Nb合金の力学的性質変化に及ぼす二軸圧縮ひずみ経路の影響

    石川慎一,清水一郎,久田一樹,竹元嘉利,多田直哉

    第65回塑性加工連合講演会  塑性加工学会

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    Event date: 2014.10.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 局所変形性の高いβ型チタン合金の相安定性と変形に伴う組織変化

    万谷義和,竹元嘉利

    日本金属学会2014年度秋期講演大会  日本金属学会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • ホットスタンピング部材の特性に及ぼすMn添加の影響

    辻村允希,瀬沼武秀,竹元嘉利

    第168回鉄鋼協会秋季講演大会  日本鉄鋼協会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋  

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  • Ti-4Fe-yAlの機械的特性と焼き戻しに伴う組織変化

    永久裕一,竹元嘉利,瀬沼武秀

    第168回鉄鋼協会秋季講演大会  日本鉄鋼協会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋  

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  • 超高強度部材の特性に及ぼすNbの影響

    松本昌大,瀬沼武秀,竹元嘉利

    第168回鉄鋼協会秋季講演大会  日本鉄鋼協会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋  

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  • Ti-X-7Al合金の焼戻しに伴う特異現象

    竹元嘉利,井尻政孝,滝川新,田中達也,瀬沼武秀

    日本金属学会2014年度秋期講演大会  日本金属学会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • Ti-10Mo-7AlとTi-35Nb-7Al合金の焼戻しに伴う特異現象

    井尻政孝,竹元嘉利,瀬沼武秀

    第168回鉄鋼協会秋季講演大会  日本鉄鋼協会

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    Event date: 2014.9.25

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋  

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  • 共析鋼におけるVCの析出挙動に及ぼす加工と冷速の影響

    信吉隆宏,瀬沼武秀,竹元嘉利

    第57回鉄鋼協会中四国支部講演大会  鉄鋼協会中四国支部

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    Event date: 2014.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 極低炭素鋼の再結晶挙動に及ぼすNbの影響

    羽床春輝,瀬沼武秀,竹元嘉利

    第57回鉄鋼協会中四国支部講演大会  鉄鋼協会中四国支部

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    Event date: 2014.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 鉄鋼材料のせん断加工時の延性破壊

    森 大祐,日野慎也,瀬沼武秀,竹元嘉利

    第57回鉄鋼協会中四国支部講演大会  鉄鋼協会中四国支部

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    Event date: 2014.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • ホットスタンピング部材の機械的特性に及ぼすTi,Nbの影響

    臼杵 諒,瀬沼武秀,竹元嘉利

    第57回鉄鋼協会中四国支部講演大会  鉄鋼協会中四国支部

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    Event date: 2014.8.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • Ti-5Al-2Fe-3Mo合金の加工と焼戻しで形成されるα”の構造

    朝倉健太,竹元嘉利,瀬沼武秀,國枝知徳,藤井秀樹

    第6回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2014.6.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • Ti-4Fe-7Al合金の焼戻しに伴う電気抵抗変化

    竹元嘉利,馬場 勝一朗,瀬沼武秀

    第6回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2014.6.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • Ti-10Mo-7AlとTi-35Nb-7Alの特異現象と引張特性

    藤岡 渉,竹元嘉利,瀬沼武秀,滝川 新,田中達也

    第6回軽金属学会中四国支部講演大会  軽金属学会中四国支部

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    Event date: 2014.6.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松江  

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  • 高強度鋼板の穴広げ性の簡易評価方法

    日野慎也,瀬沼武秀,竹元嘉利

    第167回秋季講演大会  日本鉄鋼協会

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    Event date: 2014.3.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

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  • 超高強度部材の耐遅れ破壊性に及ぼすマルテンサイト粒径と微細析出物の影響

    松本昌大,瀬沼武秀,竹元嘉利

    第167回秋季講演大会  日本鉄鋼協会

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    Event date: 2014.3.22

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

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  • ドイツ式180°曲げ試験規格「VDA 238-100」に準じた曲げ試験治具の設計製作とマルテンサイト結晶粒径が及ぼす曲げ性への影響

    畠山伸也,瀬沼武秀,竹元嘉利

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • Ti-4Fe-7Al合金の電気抵抗変化に及ぼす焼戻しの影響

    馬場勝一朗,竹元嘉利,瀬沼武秀

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • DP鋼と焼き戻しマルテンサイト鋼の延性破壊挙動の比較

    石尾遼平,臼杵 諒,竹元嘉利,瀬沼武秀

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • Ti-6Mn-7Al合金における焼戻しに伴う組織・構造変化

    滝川 新,竹元嘉利,瀬沼武秀

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • 準安定β型Ti-Nb合金の単軸および等二軸圧縮試験における等塑性仕事曲面の変化

    久田一樹,清水一郎,竹元嘉利,多田直哉

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • Ti,Cu単独ならびに複合添加鋼の析出状態と遅れ破壊への影響

    田中達也,瀬沼武秀,竹元嘉利

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • Ti-4Fe-7Al合金の相変態挙動に及ぼす酸素の影響

    久保裕作,竹元嘉利,瀬沼武秀

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • V添加共析鋼の硬さに及ぼす冷却速度の影響

    平石浩司,竹元嘉利,瀬沼武秀

    「第28回若手フォーラム」  日本金属学会・日本鉄鋼協会中国四国支部

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    Event date: 2014.2.21

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山市  

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  • 超高強度ホットスタンピング部材の組織と特性に及ぼすCuとCu-Tiの影響

    石尾遼平,瀬沼武秀,竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼「第27回若手フォーラム」 

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    Event date: 2013.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-5Al-2Fe-3Mo合金の焼戻しに伴う逆形状記憶と組織変化

    朝倉健太,竹元嘉利,瀬沼武秀,國枝知徳,藤井秀樹

    日本軽金属学会中国四国支部「第27回若手フォーラム」 

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    Event date: 2013.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超高強度ホットスタンピング部材の組織と特性に及ぼすCu、Cu-Tiの影響

    石尾遼平,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 冷延DP鋼の組織予測

    須江龍裕,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • ホットスタンピング部材の組織と特性に及ぼすMnの影響

    辻村允希、瀬沼武秀、竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • ホットスタンピング部材の組織・特性に及ぼすV、Nb、Cuの影響

    立山祥大,難波孝明,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • Ti-Nb合金における焼入れα'およびα"マルテンサイトの変形に伴う構造変化

    万谷義和,竹元嘉利

    日本金属学会第153回秋期講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • V,Cu添加中炭素鋼の析出強化挙動

    村瀬雄紀,瀬沼武秀,竹元嘉利

    日本金属学会第153回秋期講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • ホットスタンピング部材の機械的性質に及ぼすVの影響

    馬場 裕,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 共析鋼におけるVの析出挙動

    山道崇幸,村瀬雄紀,瀬沼武秀,竹元嘉利

    日本金属学会第153回秋期講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 2相ステンレス冷延鋼板の再結晶挙動

    難波孝明,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • V,Cu添加中炭素鋼の析出硬化挙動

    瀬沼武秀,村瀬雄紀,岩佐尚幸,竹元嘉利,坂田尚浩

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 遅れ破壊に及ぼす組織制御の影響

    安岡優一,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • Ti-5Al-2Fe-3Moの等温マルテンサイト変態に及ぼす溶体化処理温度の影響

    國枝知徳,藤井秀樹,高橋一浩,竹元嘉利

    日本鉄鋼協会第166回秋季講演大会 

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    Event date: 2013.9.17 - 2013.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 準安定β型Ti-Nb合金の比例ひずみ経路冷間二軸圧縮変形挙動に及ぼす合金組成の影響

    久田一樹,清水一郎,竹元嘉利,多田直哉

    日本機械学会2013年度年次大会 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-4Fe-7Alの焼戻しに伴う組織・構造変化

    永久裕一,藤岡 渉,竹元嘉利,瀬沼武秀

    日本金属学会中国四国支部第53回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • V,Cu添加中炭素鋼の析出強化挙動

    村瀬雄紀、瀬沼武秀、竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼第56回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超強度鋼材の機械的性質に及ぼすVの影響

    馬場 裕,瀬沼武秀,竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼第56回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング部材の機械的性質に及ぼすCの影響

    山本賢治,瀬沼武秀,竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼第56回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超高強度ホットスタンピング部材の組織と特性に及ぼすCuとCu-Tiの影響

    石尾遼平,瀬沼武秀,竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼第56回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 共析鋼におけるVの析出挙動

    山道崇幸,村瀬雄紀,瀬沼武秀,竹元嘉利

    日本鉄鋼協会中国四国支部鉄鋼第56回講演大会 

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    Event date: 2013.8.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-4Fe-7Al合金の高温で形成されるマルテンサイト的な変態挙動

    竹元嘉利,永久裕一,藤岡 渉,瀬沼武秀

    第5回軽金属学会中国四国支部講演大会 

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    Event date: 2013.7.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-5Al-2Fe-3Mo合金の焼戻しに伴う逆形状記憶と組織変化

    朝倉健太,竹元嘉利,瀬沼武秀,國枝知徳,藤井秀樹

    第5回軽金属学会中国四国支部講演大会 

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    Event date: 2013.7.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Development of 2000MPa Class Hot Stamped Steel Components with Good Toughness and High Resistance against Delayed Fracture International conference

    ISAS2013 

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    Event date: 2013.6.9 - 2013.6.12

    Language:English   Presentation type:Oral presentation (general)  

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  • Hydrogen Embrittlement Properties of Ultra High-Strength Low Alloy TRIP-Aided Steels with Hot Forging Process International conference

    ISAS2013 

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    Event date: 2013.5.21 - 2013.5.24

    Language:English   Presentation type:Oral presentation (general)  

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  • 高温二相域で溶体化処理したTi-5Al-2Fe-3Moの加速時効硬化挙動

    國枝知徳,藤井秀樹,高橋一浩,竹元嘉利,和田恵太

    日本鉄鋼協会第165回春季講演大会 

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    Event date: 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-4Fe-xAl合金の焼戻しに伴う硬さと組織変化

    竹元嘉利,藤井和也,中塚翔,瀬沼武秀

    日本鉄鋼協会第165回春季講演大会 

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    Event date: 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 高温二相域溶体化処理後軽冷間圧延したTi-5Al-2Fe-3Moの昇温に伴う組織変化

    竹元嘉利,和田惠太,瀬沼武秀,國枝知徳,藤井秀樹

    日本鉄鋼協会第165回春季講演大会 

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    Event date: 2013.3.29

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  • Ti-5Al-2Fe-3Moの加速時効硬化挙動に及ぼす溶体化処理条件の影響

    國枝知徳,藤井秀樹,高橋一浩,竹元嘉利,和田恵太

    日本鉄鋼協会第165回春季講演大会 

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    Event date: 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • β型チタン合金の塑性変形挙動に及ぼす相安定性と応力誘起変態の影響

    万谷義和,竹元嘉利,工藤邦男

    日本鉄鋼協会第165回春季講演大会 

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    Event date: 2013.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング部材の組織,特性に及ぼすMnの影響

    辻村允希,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • 2相ステンレス冷延鋼板の再結晶挙動

    難波孝明,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • ホットスタンピング部材の組織,特性に及ぼすTi,Nb複合添加の影響

    細見司,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-4Fe-7Alの特異現象と焼戻しによる構造変化に及ぼすAlの影響

    永久裕一,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-5Al-2Fe-3Mo合金の焼戻しに伴う特異現象

    朝倉健太,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • β型合金Ti-4Fe-xAlの機械的特性

    藤岡渉,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • 0.33%C鋼と0.4%C鋼の逆変態挙動と機械的性質

    山本賢治,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • 鋼の組織制御に及ぼすVの影響

    馬場裕,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第26回若手フォーラム」 

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    Event date: 2013.2.22

    Language:Japanese   Presentation type:Poster presentation  

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  • 準安定βチタン合金の多軸塑性挙動に及ぼす変形機構の影響に関する基礎的検討

    清水一郎, 久田一樹, 竹元嘉利, 多田直哉

    日本非破壊検査協会 応力・ひずみ測定と強度評価シンポジウム 

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    Event date: 2013.1.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Fe-Al合金の等温マルテンサイトの変態挙動

    竹元嘉利

    日本金属学会中国四国支部第114回金属物性研究会 

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    Event date: 2012.12.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • β型チタン合金の変形その場観察による弾塑性変形挙動の検討

    万谷義和,竹元嘉利,工藤邦男

    日本金属学会第151回大会 

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    Event date: 2012.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

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  • Ti-4Fe-7Al合金の熱処理に伴う相変態挙動

    竹元嘉利,藤井和也,中塚 翔,瀬沼武秀

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

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  • Ti-4Fe-7Alの焼戻しに伴う組織と構造変化

    藤井和也,竹元嘉利,瀬沼武秀

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 炭素鋼の逆変態挙動のモデル化

    林 公平,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 2000MPa級ホットスタンピング部材の遅れ破壊特性に及ぼす成分組織の影響

    山本浩介,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 超微細マルテンサイト組織形成とその特性に及ぼす熱延組織、加熱冷却速度の影響

    森岡健太郎,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • Nb添加ホットスタンピング部材の組織と機械的性質

    谷口龍磨,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 冷間加工したTi-5Al-2Fe-3Moの熱処理中における特異な形状変化特性

    國枝知徳,藤井秀樹,高橋一浩,和田恵太,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

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  • 極低炭素鋼の回復挙動に及ぼすTiの影響

    武 修平,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第164回大会 

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    Event date: 2012.9.18

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 超微細マルテンサイト組織形成とその特性に及ぼすTi の影響

    時澤彰孝,瀬沼武秀,竹元嘉利

    日本金属学会第151回大会 

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    Event date: 2012.9.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 昇温時の低炭素鋼の組織変化

    小野貴史,瀬沼武秀,竹元嘉利

    日本金属学会第151回大会 

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    Event date: 2012.9.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 超微細マルテンサイト組織形成とその特性に及ぼすCu,Cu-Tiの影響

    石尾遼平,瀬沼武秀,竹元嘉利

    日本金属学会第151回大会 

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    Event date: 2012.9.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • パーライト鋼の逆変態挙動

    山道崇幸,瀬沼武秀,竹元嘉利

    日本金属学会第151回大会 

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    Event date: 2012.9.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:松山  

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  • 超微細マルテンサイト組織形成とその特性に及ぼすV,Nbの影響 International conference

    立山祥大,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 0.28%C-3%Mn-0.3%V鋼の超微細マルテンサイト組織形成とその特性に及ぼすCu,Nb添加の影響 International conference

    難波孝明,朝倉健太,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • β型Ti-4Fe-7Al合金の焼戻しにおける特異現象 International conference

    中塚翔,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 低炭素鋼の逆変態,変態に及ぼすMn量の影響 International conference

    辻村允希,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 超微細マルテンサイト組織創形成に及ぼす冷延組織,加熱冷却速度の影響 International conference

    須江龍裕,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 超微細マルテンサイト組織形成とその特性に及ぼすTi,Nbの影響 International conference

    安岡優一,谷口龍磨,時澤彰孝,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • Ti-5Al-2Fe-3Mo合金における逆形状記憶特性におよぼす組織の影響 International conference

    和田惠太,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2012.8.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • Ti-xFe-yAl合金の組織と機械特性

    竹元嘉利, 越智昌宏, 瀬沼武秀, 高田潤, 清水一郎, 松木一弘

    日本鉄鋼協会 第163回春季講演大会 

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    Event date: 2012.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • Ti-4Fe-7Al合金の特異な現象

    竹元嘉利, 越智昌宏, 瀬沼武秀, 高田潤, 清水一郎, 松木一弘

    日本鉄鋼協会 第163回春季講演大会 

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    Event date: 2012.3.29

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • Nb,Tiを用いた超微細マルテンサイト組織の創成

    谷口龍磨,時澤彰孝,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • チタン合金のアパタイト形成能評価

    藤井和也,竹元嘉利,瀬沼武秀,木村光臣

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 押込み試験による縦弾性係数評価に及ぼすTi-Mo合金の変形挙動の影響

    小畠徹也,清水一郎,多田直哉,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 炭素鋼の旧γ粒径に及ぼす初期組織の影響

    森岡健太郎,須江龍裕,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • パーライト組織からの逆変態挙動の解明

    山道崇幸,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • Cu及びCu-Tiを用いた超微細マルテンサイトの創成

    石尾遼平,立山祥太,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第24回若手フォーラム」 

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    Event date: 2012.2.29

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • チタン合金の低ヤング率化について

    竹元嘉利

    第91回人工関節の機能高度化研究会 

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    Event date: 2012.1.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-Fe合金の組織と延性に及ぼすAlの影響

    越智昌宏,竹元嘉利,瀬沼武秀,松木一弘

    日本金属学会第149回講演大会 

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    Event date: 2011.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄  

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  • Cu添加鋼の析出挙動とモデル化

    岩佐 尚幸,瀬沼 武秀,竹元 嘉利

    日本金属学会第149回講演大会 

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    Event date: 2011.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄  

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  • Ti-Fe合金のAl添加による延性の発現

    竹元嘉利,越智昌宏,瀬沼武秀,松木一弘

    軽金属学会中四国支部60周年記念講演会 

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    Event date: 2011.9.12

    Presentation type:Oral presentation (general)  

    Venue:松山  

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  • 極低炭素鋼の回復・再結晶挙動に及ぼすTiの影響

    武修平 ,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中四国支部講演会 

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    Event date: 2011.8.8

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 穴広げ性に及ぼす添加元素の影響

    上林恭平,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中四国支部講演会 

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    Event date: 2011.8.8

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-Fe合金の組織と延性に及ぼすAlの影響

    越智昌宏,竹元嘉利,瀬沼武秀,松木一弘

    日本金属学会・日本鉄鋼協会中四国支部講演会 

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    Event date: 2011.8.8

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Ti-Al-Fe系合金の組織と機械特性におよぼす熱処理温度の影響

    和田惠太,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中四国支部講演会 

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    Event date: 2011.8.8

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 炭素鋼の逆変態挙動のモデル化

    飛鷹健太,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中四国支部講演会 

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    Event date: 2011.8.8

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Effect of Rapid Heating on Evolution of Microstructures and Coating Layers in Hot Stamping Processes International conference

    Proc. of 3rd Int. Conf. on Hot Sheet Metal Forming of High-Performance Steel 

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    Event date: 2011.6.13 - 2011.6.17

    Language:English   Presentation type:Oral presentation (general)  

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  • 炭素鋼の逆変態挙動に及ぼす初期組織の影響

    小野貴史,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 引張変形挙動に及ぼす結晶粒径の影響

    山本浩介,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • ビキタス元素を利用したチタン合金の組織と機械特性におよぼす熱処理温度の影響

    和田惠太,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • Al-Si-Mg系アルミ合金の析出モデル

    滝本洋介,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 極低炭素鋼の連続焼鈍工程におけるCの固溶析出挙動

    オ ドンイク,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • 2相域加熱からの変態挙動のモデル化

    林 公平,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第22回若手フォーラム」 

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    Event date: 2011.2.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:岡山  

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  • ホットスタンピング用鋼板の硬さに及ぼす加熱速度,加熱温度,冷却速度の影響

    飛鷹健太,瀬沼武秀,竹元嘉利

    日本鉄鋼協会・日本金属学会中国四国支部第21回若手フォーラム 

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    Event date: 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Fe-Al合金の組織と硬さにおよぼすFe,Alの影響

    越智昌宏,竹元嘉利,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部第21回若手フォーラム 

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    Event date: 2010.12.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 希少金属を使用しないTi-Fe-Al合金の開発

    竹元嘉利

    日本鉄鋼協会・日本金属学会中国四国支部第109回 金属物性研究会 

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    Event date: 2010.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング材の張出し成形に及ぼす諸因子の影響

    藤岡尚浩,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • V,Cu添加中炭素鋼の析出挙動ならびに析出強化挙動

    宮本誠,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • 中炭素鋼のVCNの析出挙動

    岩佐尚幸,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • ホットスタンピング用鋼板の硬さに及ぼす,加熱速度,加熱温度,冷却速度の影響

    飛鷹健太,竹元嘉利,瀬沼武秀

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • VCの相界面析出挙動のモデル化

    新谷昌広,竹元嘉利,瀬沼武秀

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • Al添加によるTi-Fe合金の組織変化

    竹元嘉利,越智昌宏,瀬沼武秀

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Mo-Cu-(Al)合金の引張特性と微細組織

    島田勝,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第160回秋季大会 

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    Event date: 2010.9.25 - 2010.9.27

    Language:Japanese   Presentation type:Poster presentation  

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  • 微小押込み試験によるTi-Mo 合金の結晶方位評価

    木村 訓明,清水 一郎,多田 直哉,竹元 嘉利

    日本機械学会2010年度年次大会 

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    Event date: 2010.9.5 - 2010.9.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 中炭素鋼のVCNの析出挙動

    岩佐尚幸,瀬沼武秀,竹元嘉利

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2010.8.10 - 2010.8.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング用鋼板の硬さに及ぼす加熱速度,加熱温度,冷却速度の影響

    飛鷹健太,瀬沼武秀,竹元嘉利

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2010.8.10 - 2010.8.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Dv-Xα法によって設計されたTi合金の構成相および機械特性

    島田 勝,竹元嘉利,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2010.8.10 - 2010.8.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Thermal History on Microstructure and Mechanical Properties of Steels for Hot Stamping International conference

    PRICM7 

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    Event date: 2010.8.2 - 2010.8.6

    Language:English   Presentation type:Oral presentation (general)  

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  • Ti-Fe-Al合金のω相の生成におよぼすFe,Alの影響

    越智昌宏,竹元嘉利,瀬沼武秀

    軽金属学会 中国四国支部講演大会 

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    Event date: 2010.7.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 三元系β型Ti合金の設計と機械的特性

    島田 勝,竹元嘉利,瀬沼武秀

    軽金属学会 中国四国支部講演大会 

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    Event date: 2010.7.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • チタン合金の低ヤング率化と変形に伴う擬弾性特性

    竹元嘉利

    日本鉄鋼協会・日本金属学会中国四国支部第39回材質制御研究会 

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    Event date: 2010.6.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Precipitation hardening behavior of V containing middle carbon steel International conference

    PTM2010 

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    Event date: 2010.6.6 - 2010.6.11

    Presentation type:Oral presentation (general)  

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  • Fe-Al 合金単結晶の引張特性と最終安定方位

    竹元嘉利

    日本鉄鋼協会第159回春季大会 

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    Event date: 2010.3.28 - 2010.3.30

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング用鋼板の組織材質に及ぼすMn添加量,熱処理条件の影響

    飛鷹健太,田中悠介,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • 高強度鋼板の焼鈍時の組織・集合組織変化

    岡井 均,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • Moの高温変形応力の研究

    張 石涛,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • 高強度鋼板の延性-穴広げ性バランスに及ぼすTi, Nbの影響

    上林恭平,田辺 豊,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • 中炭素鋼のVCの析出挙動に及ぼす添加元素の影響

    竹安則継,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • 中炭素鋼のVCNの析出挙動に及ぼす加工の影響

    岩佐尚幸,新谷昌広,宮本 誠,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • 軽量鋼板の組織制御

    瀬戸啓介,小澤 浩,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • テーラードブランクホットスタンピング材の研究

    中島圭一,藤岡尚浩,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第20回若手フォーラム」 

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    Event date: 2010.1.29

    Language:Japanese   Presentation type:Poster presentation  

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  • VCの相界面析出挙動のモデル化

    永井太伊地,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第158回秋季講演大会 

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    Event date: 2009.9.15 - 2009.9.17

    Language:Japanese   Presentation type:Poster presentation  

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  • 熱間加工工程におけるV(CN)の一貫析出モデルの開発

    瀬沼武秀・首藤智旭・永井太伊地・新谷昌広・竹元嘉利, 古原忠

    日本鉄鋼協会第158回秋季講演大会 

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    Event date: 2009.9.15 - 2009.9.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 鉄酸化細菌Leptothrix ochraceaが作る鞘状酸化鉄のキャラクタリゼーション

    古谷充章、橋本英樹、浅岡裕史、草野圭弘、竹元嘉利、池田靖訓、中西真、藤井達生、高田潤

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 0.45%C鋼の硬さに及ぼす成分、冷却条件の影響

    竹安則継、瀬沼武秀、竹元嘉利

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 高アルミ添加鋼の硬さに及ぼす熱処理の影響

    小澤浩、永井太伊地、竹元嘉利、瀬沼武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ホットスタンピング用材料の硬さに及ぼす成分、加熱条件の影響

    田中悠介、藤岡尚浩、竹元嘉利、瀬沼武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • VCの析出モデル

    新谷昌広、永井太伊地、竹元嘉利、瀬沼武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 590MPa級高強度鋼板の穴広げ性に及ぼす成分の影響

    田辺豊、宮本誠、竹元嘉利、瀬沼 武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 熱間張り出し性に及ぼす諸因子の影響

    藤岡尚浩、越智昌宏、上林恭平、竹元嘉利、瀬沼武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Fe-3%Al単結晶の引張特性と結晶方位回転

    前田陽平、竹元嘉利、榊原精、瀬沼武秀

    日本鉄鋼協会第52回・日本金属学会49回中国四国支部講演大会 

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    Event date: 2009.8.6 - 2009.8.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Mo合金における圧痕形状およびその周囲の変形とそれらの結晶方位依存性

    木村 訓明,清水 一郎,多田 直哉,竹元 嘉利,石田 貴久

    日本材料学会第58学術講演会 

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    Event date: 2009.5.23 - 2009.5.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オーステナイト域におけるV(C,N)の析出挙動のモデル化

    首藤智旭,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第18回若手フォーラム」 

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    Event date: 2009.3.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 極低炭素鋼の再結晶挙動のモデル化

    西谷宗剛,瀬沼武秀,榊原精,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第18回若手フォーラム」 

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    Event date: 2009.3.9

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 高生産性新ホットスタンピング技術(第1報)?形状凍結性に及ぼす諸因子の影響?

    瀬沼武秀・馬込英明・田邉章宏・*竹元嘉利

    自動車技術会2008年秋季大会 

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    Event date: 2008.10.22 - 2008.10.24

    Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 高生産性新ホットスタンピング技術(第2報)?成形性と打ち抜き部の遅れ破壊性?

    馬込英明・瀬沼武秀・田邉章宏・竹元嘉利

    自動車技術会2009年秋季大会 

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    Event date: 2008.10.22 - 2008.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 高生産性新ホットスタンピング技術(第3報)?短時間急速加熱時のスケール成形とスケールガード処理?

    田邉章宏,馬込英明,瀬沼武秀,竹元嘉利,日野実

    自動車技術会2008年秋季大会 

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    Event date: 2008.10.22 - 2008.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 中炭素鋼中のVCNとCuの複合析出挙動

    坂本大典,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第156回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Presentation type:Poster presentation  

    Venue:熊本  

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  • Ti-6Mo合金の機械特性と微細組織に及ぼす添加元素の影響

    竹元嘉利・三宅章義・瀬沼武秀, 大塚広明・藤井秀樹

    日本鉄鋼協会第159回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 中炭素鋼中のVCNとCuの複合析出挙動

    坂本大典,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第158回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Language:Japanese   Presentation type:Poster presentation  

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  • Model for predicting microstructure of extralow carbon steels

    T.Senuma・Y.Takemoto

    日本鉄鋼協会第160回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オーステナイト域におけるV(C,N)の析出挙動のモデル化

    首藤智旭,瀬沼武秀,竹元嘉利

    日本鉄鋼協会第157回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

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  • Ti-6Mo-X-Y合金の微細組織と機械的特性

    三宅章義,竹元嘉利,瀬沼武秀

    日本鉄鋼協会第156回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Language:Japanese   Presentation type:Poster presentation  

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  • Ti-6Mo合金の機械特性と微細組織に及ぼす添加元素の影響

    *竹元嘉利・三宅章義・瀬沼武秀, 大塚広明・藤井秀樹

    日本鉄鋼協会第156回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Presentation type:Oral presentation (general)  

    Venue:熊本  

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  • 極低炭素鋼の再結晶挙動のモデル化

    西谷宗剛・瀬沼武秀・榊原精・*竹元嘉利

    日本鉄鋼協会第156回秋季講演大会 

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    Event date: 2008.9.23 - 2008.9.25

    Presentation type:Oral presentation (general)  

    Venue:熊本  

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  • Grain refinement of extralow-carbon steels in hot strip rolling International conference

    T. Senuma, *Y. Takemoto

    Associazione Italiana di Metallurgia 

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    Event date: 2008.9.10 - 2008.9.12

    Venue:Padova, Italy  

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  • Ti-6Mo-X-Y合金の微細組織と引張特性

    三宅 章義,島田 勝,竹元 嘉利,瀬沼 武秀

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2008.8.7 - 2008.8.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 軽量高強度鋼板の組織制御

    永井 太伊地,曽我部 大輔,瀬沼 武秀, 竹元 嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2008.8.7 - 2008.8.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 極低炭素鋼の再結晶挙動のモデル化

    西谷 宗剛,瀬沼 武秀,榊原 精,竹元 嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2008.8.7 - 2008.8.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 鋼中のVCとCuの複合析出挙動

    坂本 大典,竹安 則継,瀬沼 武秀,竹元 嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2008.8.7 - 2008.8.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オーステナイト域におけるV(C,N)の析出挙動のモデル化

    首藤 智旭,瀬沼 武秀,竹元 嘉利

    日本金属学会・日本鉄鋼協会中国四国支部講演大会 

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    Event date: 2008.8.7 - 2008.8.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • β型Ti-Mo合金の弾性挙動とその組成依存性

    清水一郎,*竹元嘉利

    日本実験力学会2008年度年次講演会 

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    Event date: 2008.6.30

    Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • Influence of press forming conditions on the shape fixability of hot stamped hat-type parts International conference

    T. Senuma and *Y. Takemoto

    SCT2008 

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    Event date: 2008.6.2 - 2008.6.5

    Presentation type:Oral presentation (general)  

    Venue:Wiesbaden Germany  

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  • 鋼の組織予測モデルの開発

    吉岡勇貴,森本和浩,西谷宗剛,*竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第15回若手フォーラム」 

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    Event date: 2008.1.31

    Presentation type:Poster presentation  

    Venue:岡山  

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  • 極低炭素冷延鋼板の再結晶挙動のモデル化

    西谷宗剛,瀬沼武秀,竹元嘉利

    日本金属学会・日本鉄鋼協会中国四国支部「第15回若手フォーラム」 

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    Event date: 2008.1.31

    Language:Japanese   Presentation type:Poster presentation  

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  • めっき特性に及ぼす加熱条件の影響

    田邉章宏,竹元嘉利,瀬沼武秀,生田文昭

    日本金属学会・日本鉄鋼協会中国四国支部「第15回若手フォーラム」 

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    Event date: 2008.1.31

    Language:Japanese   Presentation type:Poster presentation  

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  • ホットスタンピング部品の形状凍結性に及ぼす成形条件の影響

    竹元嘉利,馬込英明,田邉章宏,瀬沼武秀

    第58回塑性加工連合講演会 

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    Event date: 2007.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Ti-Mo合金系の加工特性と微細組織

    *竹元嘉利,清水一郎

    日本鉄鋼協会第154回秋季講演大会 

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    Event date: 2007.9.19

    Presentation type:Oral presentation (general)  

    Venue:岐阜  

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  • Ti-Mo合金の機械的性質に及ぼす組織の影響

    安永裕介,三宅章義,竹元嘉利,瀬沼武秀

    日本鉄鋼協会・日本金属学会 中国四国支部講演大会 

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    Event date: 2007.8.9 - 2007.8.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Anelastic behavior of Ti-8mass%Mo alloy by pre-deformation International conference

    Yoshito Takemoto, Akira Sakakibara and Takehide Senuma

    The 11th World Conference on Titanium 

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    Event date: 2007.6.4

    Language:English   Presentation type:Poster presentation  

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  • The effect of deformation mechanism on plastic behavior of β-type Ti-Mo alloys International conference

    Ichiro Shimizu, *Yoshito Takemoto

    The 11th World Conference on Titanium 

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    Event date: 2007.6.4

    Presentation type:Poster presentation  

    Venue:Kyoto  

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  • BCC単結晶(Fe-3%Al)の対称軸引張特性

    *竹元嘉利

    「計算工学による組織と特性予測技術」研究会 

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    Event date: 2007.5.31

    Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • 高アルミ鋼の時効硬化

    西川 和秀,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第13回若手フォーラム」 

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    Event date: 2007.1.26

    Language:Japanese   Presentation type:Poster presentation  

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  • ホットスタンピング材の形状凍結性に及ぼす加工条件の影響

    田邊章宏,馬込英明,竹元嘉利,瀬沼武秀

    日本金属学会・日本鉄鋼協会中国四国支部「第13回若手フォーラム」 

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    Event date: 2007.1.26

    Language:Japanese   Presentation type:Poster presentation  

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  • Fe-3%Al合金単結晶の対称引張特性

    中橋勇輝,*竹元嘉利,瀬沼武秀,榊原 精

    日本金属学会・日本鉄鋼協会中国四国支部「第13回若手フォーラム」 

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    Event date: 2007.1.26

    Presentation type:Poster presentation  

    Venue:岡山  

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  • Analysis of Fine Stress Fields in Metal Matrix Composites Using HOLZ Patterns

    M. Shibata and *Y. Takemoto

    Int. Conf. on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS 

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    Event date: 2006.7.4 - 2006.7.8

    Venue:Vancouver  

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  • β型チタン合金の変形挙動に及ぼす相変態の影響

    *竹元嘉利,清水一郎,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部,第98回金属物性研究会 

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    Event date: 2006.6.30

    Venue:新居浜市  

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  • ホルツパターンを用いた金属基複合材料内の微小ひずみ場の解析

    柴田政勝,*竹元嘉利

    日本金属学会春期大会 

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    Event date: 2006.3.22

    Venue:東京  

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  • β型Ti合金の弾性挙動と予加工の影響

    竹元嘉利

    日本鉄鋼協会第151回春季講演大会 

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    Event date: 2006.3.21

    Venue:東京  

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  • Ti-Nb合金のNb添加量に伴う焼入れ組織と機械的性質の変化

    谷本 祝,*竹元嘉利,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部第11回若手フォーラム 

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    Event date: 2006.1.26

    Venue:岡山市  

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  • Mo単結晶の[110]引張りにおける転位組織と硬さの変化

    永濱淳哉,*竹元嘉利,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部第11回若手フォーラム 

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    Event date: 2006.1.26

    Venue:岡山市  

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  • Ti-Mo合金焼入れ材の組成に伴う変形特性および微細構造変化

    鈴村直紀,*竹元嘉利,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部第11回若手フォーラム 

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    Event date: 2006.1.26

    Venue:岡山市  

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  • 2元系β型Ti合金の変形に伴う弾性挙動変化

    *竹元嘉利,清水一郎,榊原 精,瀬沼武秀

    日本金属学会第137回秋期大会 

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    Event date: 2005.9.29

    Venue:東広島市  

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  • Mo単結晶の引張変形に伴う加工硬化と転位組織

    永濱淳哉,竹元嘉利,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2005.8.9

    Venue:徳島市  

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  • Ti-Mo合金の準安定相と引張特性

    鈴村直紀,*竹元嘉利,清水一郎,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2005.8.9

    Venue:徳島市  

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  • Ti-Nb合金のNb添加量に伴う焼入れ組織と機械的性質

    谷本 祝,*竹元嘉利,清水一郎,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2005.8.9

    Venue:徳島市  

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  • Ti-8Mo合金の加工に伴う弾性挙動の変化

    *竹元嘉利,榊原 精,瀬沼武秀

    日本鉄鋼協会・日本金属学会中国四国支部講演大会 

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    Event date: 2005.8.9

    Venue:徳島市  

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  • マイカ基板上の TiO2-VO2 系膜におけるスピノーダル分解の発現

    村岡 祐治, 西川僚馬, 野島康平, 竹元 嘉利, 脇田高徳, 横谷尚睦

    応用物理学会中国四国支部学術講演大会  2024.7.28 

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  • Ti-18Nb-xAl合金の結晶構造と材料特性に及ぼすAl添加量の影響

    万谷 義和, 竹元 嘉利

    日本金属学会第174回講演大会  2024.3.14 

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  • Ti-10V-2Fe-3Al合金の焼戻しに伴う形状変化及び機械的性質

    石原 大暉, 四宮 大輝, 横田 啓人, 竹元 嘉利

    日本金属学会・日本鉄鋼協会中四国支部第55回若手フォーラム  2024.2.10 

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  • Cu-Beの形状進展に及ぼす試料厚さの影響

    貞益 史門, 松田 大生, 竹元 嘉利

    日本金属学会・日本鉄鋼協会中四国支部第55回若手フォーラム  2024.2.10 

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  • Ti-10V-2Fe-3Al合金の焼戻しに伴う機械特性変化

    四宮大輝, 石原大暉, 竹元嘉利

    日本金属学会中国四国支部 第139回 金属物性研究会  2023.12.14 

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  • Ti-20Nb合金の相変化に及ぼす焼戻し速度の影響

    尾形陸斗, 竹元嘉利, 清水一郎

    日本金属学会中国四国支部 第139回 金属物性研究会  2023.12.14 

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  • Ti-10V-2Fe-3Al合金の形状進展メカニズムと熱処理に伴う靭性回復

    四宮大輝, 横田啓人, 竹元嘉利

    日本金属学会・日本鉄鋼協会 中国四国支部第53回「若手フォーラム」  2023.12.13 

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  • Ti-20Nb合金の焼戻しにおける昇温速度の影響

    尾形陸斗, 目崎雄大, 竹元嘉利, 清水一郎

    日本金属学会・日本鉄鋼協会 中国四国支部第53回「若手フォーラム」  2023.12.13 

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  • Ti-Mo合金の引張特性に及ぼすα相の析出形態の影響

    中野政秀, 竹元嘉利, 清水一郎

    日本金属学会・日本鉄鋼協会 中国四国支部第53回「若手フォーラム」  2023.12.13 

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  • Ti-Mo合金におけるα相の析出形態が機械的特性に及ぼす影 響

    中野政秀, 竹元嘉利, 清水一郎

    軽金属学会中国四国支部講演大会  2023.10.14 

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  • Ti-20Nb合金の焼戻しにおける相変化の時間依存性

    尾形陸斗, 目崎雄大, 竹元嘉利, 清水一郎

    軽金属学会中国四国支部講演大会  2023.10.14 

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  • Ti-10Mo-7Al合金におけるβ逆変態挙動

    戸嶌悠策, 岸本龍矢, 竹元嘉利

    日本金属学会中国四国支部第62回講演大会  2022.8.23 

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  • Ti-10Mo-7Al合金の250℃時効における変態挙動

    野島 康平, 森田 洸希, 竹元 嘉利

    日本金属学会・日本鉄鋼協会中四国支部第55回若手フォーラム 

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Awards

  • 優秀講演賞

    2022.12   日本金属学会中国四国支部   Ti-10Mo-7Al合金におけるβ逆変態挙動

    戸嶌悠策

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    Award type:Award from Japanese society, conference, symposium, etc. 

  • 優秀講演賞

    2022.10   軽金属学会中国四国支部   Ti-10Moにおける微細α相の析出形態と機械特性

    津呂政孝

  • 奨励賞

    2022.3   軽金属学会中国四国支部  

    宮崎翔太郎

  • ポスター発表奨励賞

    2022.2   軽金属学会中国四国支部   Ti-20Nb合金の焼戻しに伴う相変態挙動

    目崎雄大

  • ポスター発表奨励賞

    2022.2   軽金属学会中国四国支部   Ti-10Mo合金における微細α相の形成と機械特性

    津呂政孝

  • 論文賞

    2018.9   日本金属学会   Ti-xNb-7Alの焼戻しに伴うβ→α″変態に及ぼすNb添加量の影響

    井尻政孝, 富田悠希, 石川高史, 門脇賢司, 竹元嘉利

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  • 研究・開発奨励賞

    2016.6   軽金属学会中国四国支部  

    竹元嘉利, 井尻政孝, 石川高史, 門脇賢司

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  • 研究・開発奨励賞

    2014.6   軽金属学会中国四国支部  

    竹元嘉利, 馬場 勝一朗, 瀬沼武秀

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  • 論文賞

    2013.9   日本金属学会   Ti-4Fe-7Al合金の焼戻しに伴う特異現象

    竹元嘉利, 越智昌宏, 瀬沼武秀, 高田 潤, 清水一郎, 松木一弘

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  • 研究・開発奨励賞

    2013   軽金属学会中国四国支部  

    竹元嘉利, 永久裕一, 藤岡 渉, 瀬沼武秀

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  • Best Reviewer

    2013   日本鉄鋼協会  

    竹元嘉利

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  • 軽金属学会論文賞

    2004.11  

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    Country:Japan

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  • 日本金属学会論文賞

    1997  

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    Country:Japan

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Research Projects

  • 析出物の不均一性を利用した塑性加工法の開発

    Grant number:AF-2023021-B3  2023.10 - 2027.03

    天田財団  一般研究助成 

    竹元嘉利

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    Authorship:Principal investigator 

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  • 析出誘起変形を利用した薄肉管製造法と強靭化の確立

    Grant number:2023-J-046  2023.10 - 2025.09

    泉科学技術振興財団  研究助成 

    竹元嘉利

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  • Optimal design of 2D cell type structure of magnesium alloys considering mechanical characteristics induced by deformation twins

    Grant number:21K03781  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    清水 一郎, 竹元 嘉利

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    本研究はマグネシウム合金において,集合組織と負荷様式および負荷方向に依存する変形双晶がもたらす特異な力学的挙動を定量的に理解し,その知見に基づいて所望される機能を最大限に発現する2Dセル状構造体設計手法の確立を目指している.
    2021年度は,板厚の異なる2種類のAZ31マグネシウム合金を入手し,変形様式が力学的挙動に及ぼす影響を調べた.具体的にはまず,集合組織が異なる2種類のAZ31マグネシウム合金素材に対して実施した比例ひずみ経路二軸圧縮試験の結果に基づき,圧縮塑性変形と成形限界の静水圧応力依存性を検討した.その成果として,強い集合組織を有する素材では,変形双晶の活動によって静水圧応力に対する塑性仕事増分が低下して増分増加域が現れること,圧縮成形限界時の最大せん断応力は静水圧応力とほぼ線形関係を示すが,静水圧応力の増加は変形双晶の活動を抑制する方向に働くことを明らかにした.これらは,静水圧応力が作用する多軸応力状態下にて変形双晶が力学的性質に及ぼす影響を考慮するために重要な知見である.
    続いて,2Dセル状構造体への適用を前提としたAZ31マグネシウム合金薄板材において,面内ひずみ勾配が力学的挙動に及ぼす影響を調べるため,新たに構造体ユニットセルを模した櫛形試験片による引張り曲げ試験法を考案した.複数形状のモデルに対して有限要素法解析を実施し,ひずみ勾配を制御可能な試験片形状を決定した後,レーザー加工機によってAZ31マグネシウム合金薄板材から試験片形状を切り出し,引張り曲げ試験により対称線上のひずみ勾配を評価した.その結果,対称線上において,座屈を生じることなく圧縮領域を含む直線的なひずみ勾配を得ることが可能となった.現在,圧延によって集合組織を制御した素材に対して引張り曲げ試験を実施し,変形双晶がもたらす力学的特異性に及ぼすひずみ勾配の影響について結果を蓄積している.

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  • β型チタン合金の異常なマルテンサイト変態

    2021.04 - 2024.03

    軽金属奨学会  研究補助金 

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  • Clarification and Formulation of Improvement Mechanism of Plastic Formability under Multi-axial Stress Conditions due to Mechanical Twinning of Metastable Beta-type Titanium Alloys

    Grant number:18K03857  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Shimizu Ichiro

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    The present work was performed to clarify the influences of mechanical twinning, which becomes active within the restricted range of additive beta stabilizing elements in metastable beta-type titanium alloys, upon the mechanical properties. The testing methods including uniaxial and biaxial compressions were applied mainly to the binary titanium-molybdenum alloys having different molybdenum contents. The results indicated that the activation of mechanical twinning strongly depended on the alloy composition. By the detailed investigations, the specific plastic deformation behavior induced by the mechanical twinning and the influences of deformation patterns upon it were evaluated quantitatively. Based on the relation between the macroscopic behavior and the microscopic deformation mechanisms, the trial to formulate the alloy content dependency upon the plastic deformation has been conducted with taking into account the twin activation.

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  • 極低ヤング率をもつTi-X-7Al合金の熱処理と組織

    2018.04 - 2020.03

    軽金属奨学会  研究補助金 

    竹元嘉利

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  • The mechanism of martensitic transformation induced by tempering of Ti-X-7Al alloy.

    Grant number:17K06773  2017.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Takemoto Yoshito

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    The transformation mechanism of the orthorhombic α" phase induced by tempering of the Ti-X-7Al alloy was investigated. Quenching from the β single phase region forms a slight α"-M (martensite) with the residual β phase. Rapid tempering to about 500 ° C using a salt bath or convergent light heating results in the formation of coarse α"-M over the entire surface during heating. After holding for 3 minutes or more, α"-M disappears and changes to fine α" iso due to atomic diffusion. Furthermore, α"-M reverses to the β phase when heated to about 200 ° C. Complex transformation behavior suggests that the free energy of the α phase is spinodal decomposition. It is suggested that the complicated transformation behavior is caused by the thermal stress associated with rapid heat treatment and the spinodal decomposition type free energy of α phase.

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  • Investigation of Deformation Mechanism Dependent Elastic-plastic Multi-axial Compressive Behavior and Constitutive Modeling of Metastable Beta-type Titanium Alloys

    Grant number:24560101  2012.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SHIMIZU Ichiro, TAKEMOTO Yoshito, TADA Naoya

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    Grant amount:\5330000 ( Direct expense: \4100000 、 Indirect expense:\1230000 )

    In this study, influences of the deformation mechanisms on the mechanical behavior of metastable beta-type titanium alloys have been investigated. Titanium-niobium alloys with different contents of niobium were prepared. The uniaxial and biaxial compression tests of those alloys were then conducted by using the original testing machine. The electron microscopic analyses were also performed to check the activity of plastic deformation mechanisms in order to investigate the relationship between the mechanism change and the mechanical behavior. The results revealed that special characteristics during compressive deformation such as variation of strain hardening rate and anisotropic hardening developed due to the change of dominant deformation mechanism with the niobium content. Based on the results, the constitutive modeling that is possible to express the niobium content dependency of compressive plastic behavior of titanium-niobium alloys was introduced.

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  • Deformation behavior of chaotic martensite and its reconstruction through deformation

    Grant number:18560645  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TAKEMOTO Yoshito

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    Grant amount:\3720000 ( Direct expense: \3600000 、 Indirect expense:\120000 )

    チタン合金を人工骨等に用いる場合, 人骨のヤング率相当まで引き下げることが望まれている。チタン合金の低ヤング率化には焼入れマルテンサイトが重要な組織であるが, 圧延などによってその組織形態を失い, カオス的な組織となる。しかし引張等の変形を付与するとカオス組織の中に完全なマルテンサイトが再構築される現象について研究を行った。

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  • 内部窒化による粒子分散強化が可能な新規Mo-Ti合金単結晶材料創製の試み

    Grant number:14655261  2002 - 2003

    日本学術振興会  科学研究費助成事業  萌芽研究

    吉尾 哲夫, 竹元 嘉利, 長江 正寛

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    Grant amount:\3300000 ( Direct expense: \3300000 )

    高融点金属であるMoは,核融合炉壁材等の超高温耐熱材料として再評価されつつあるが,結晶粒界の脆弱さに起因する再結晶脆化が依然として大きな問題となっている.本研究では,再結晶温度以下から段階的に温度を上げて内部窒化処理を行う多段内部窒化法によって再結晶化を制御したMo-Ti合金の異常粒成長現象を利用して,従来にない全く新規な高強度Mo系耐熱単結晶材料を作製することを目的とした.主な結果を以下に示す.
    本年度は,多段内部窒化後の熱処理による異常粒成長挙動を詳細に検討した.Mo-Ti系合金の代表的な市販材であるTZM合金(Mo-0.5Ti-0.08Zr-0.03C)圧延材について種々の条件で多段内部窒化を行い,窒化材の再結晶温度以上である1900℃にて真空加熱することにより異常粒成長させた試料を作製した.得られた試料は非常にアスペクト比の大きい単結晶類似の長大粒組織であり,これを再び窒化処理すると,TiN粒子の再分散により析出硬化が起こることを見い出した.これらの試料の強度特性を3点曲げ試験により評価したところ,窒化処理により強化したTZM合金長大粒組織材の高温強度は窒化前の長大粒組織材の約6倍であり,非常に高温強度に優れていることが明らかとなった.

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  • HOLZ図形を利用した転位等周りの微小歪場可視化法の確立と応用

    Grant number:13750613  2001 - 2002

    日本学術振興会  科学研究費助成事業  若手研究(B)

    竹元 嘉利

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    Grant amount:\2300000 ( Direct expense: \2300000 )

    本研究では材料中の転位や析出物等の周りに発生する微小歪場を,汎用の透過型電子顕微鏡を用いて測定する新たな手法について研究を行った.具体的には測定の対象とする微小領域で,収束電子線を絨毯爆撃的に入射するとともに高次ラウエゾーン(HOLZ)図形を撮影し,HOLZ図形のズレ方向かち結晶格子面の歪みをベグトルマップで表した.
    らせん転位線と平行に観察した場合,格子面がらせん状に歪んでいる様子が再現できた、刃状転位線と平行に観祭した場合には,平面歪み条件下であるにもかかわらず,山なりの歪みが生じていることがわかった.これは試料の薄膜化に伴って,転位線に沿った応力成分が歪みとして現れたものと解釈できた.
    析出物周りの測定では析出物の形状に伴って,母相の歪場形状が著しく変わることが分かうた.1つの析出物周りで表面から山状の歪場が観察された場合,裏面から同一析出物を測定すると,全く正反対の谷状の歪場として測定され,本手法の妥当性が示された。さらに同一形状の析出物でも母相界面が完全整合な場合は,析出物を中心として対称な歪みが形成されているのに対し、ミスフィット転位がある場合には非対称な歪場が形成されていることが再現でき,測定感度の高さが証明された.
    本手法では格子面の傾斜歪みを0.01°以下で検出でき,測定空間分解能はデータ処理の都合上14nmで行ったが,データ処理の制約を除けば1nmまで可能である.実際の測定において0.2μm×0.2μm領域を約200点分割領域で測定する場合,測定そのものは20分程度で終了するが,その後のデータ処理に膨大な時間と労力を要した.その点を解決するためソフト化について検討したが,可能性は十分あるものの解析精度および予算の都合上断念せざるを得なかった.

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  • Study on the mechanical alloying of metal and polymer

    Grant number:12650661  2000 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SAKAKIBARA Akira, TAKEMOTO Yoshito, HIDA Moritaka

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    Grant amount:\3700000 ( Direct expense: \3700000 )

    The automatic mortar used for preliminary experiment for open system milling was capable of refining the powder, but could not achieve the alloying of Mg-Al mixed powder and the reaction of Mg-PTFE. The capability of the vibration ball-mill was sufficient both for refining and alloying compared with the planetary ball-mill. Mg powder and PTFE powder reacted explosively during milling with vibration ball-mill. MgF_2 was found in the solid product by XRD, but hardly any fluorine was detected in the gas product by an absorption spectrophotometry. The milling time to the explosive reaction decreased with the ratio of Mg to PTFE. Using the Mg powder mechanically ground before milling with PTFE shortened the time to the explosion. Ni powder was mixed to suppress the explosion, but marked effect was not recognized. Mechanical alloying of Mg powder and Ni powder was carried out before the milling with PTFE, and then the time to the explosion decreased remarkably and the scale of explosion judged from the explosive sound, but explosion could not be halted. Refining the Mg and Ni powder is considered to prompt the reaction and the intermetallic compounds, MgNi_2 and MgNi_3, formed by the milling may act as catalyst and moderate the explosion reaction. Reaction became more complex in this case where MgNi3Cx was also found in the product. PVC did not react either with Mg powder or with the Mg-Ni mixed powder, so dechrolination was not carried out. Suppression of the explosion by Mg-PTFE milling and achievement of dechrolination by Mg-PVC milling require further investigation of more efffective catalytic argent.

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  • 加工硬化しない合金の変形メカニズムの研究

    Grant number:11750572  1999 - 2000

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    竹元 嘉利

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    Grant amount:\2500000 ( Direct expense: \2500000 )

    高比強度を有するチタン合金の中で,Ti-20mass%Mo合金焼入れ材は,変形によって加工硬化しない特異な変形挙動を示す.このメカニズムを探るため高温引張り試験を行ったところ,623K以上では加工硬化することがわかった.一方でそれより低Mo濃度のTi-14mass%Mo合金の高温引張り試験の結果は,20Mo合金の室温引張りとよく似た変形挙動を示し,Mo濃度と変形温度に正の相関があることが明らかとなった.光学顕微鏡による変形組織もその関係からうまく説明できた.
    透過型電子顕微鏡による内部微細構造を観察したところ,20Mo合金の室温状態では,全体に不整合ω相が形成されていたが,クラック先端部のような応力が集中した領域では,整合ω相に構造変化していることがわかった.この整合ω相はあるバンド状の領域内で形成されており,このような箇所で変形が集中するため,局所変形を誘発し,巨視的には加工硬化しない現象であることをつきとめることができた.応力増加に伴うω相の不整合から整合変化は,降伏応力を増大させることを予測させ,実験事実とともよく一致していた.単結晶を用いて電子顕微鏡内引張りその場観察を試みたが,バルクと薄膜では応力状態が異なるため,ω相の構造変化を連続的にとらえることはできなかった.
    一連の結果からβ型チタン合金の変形特性を,組成・温度・応力のパラメータから理解することができ,その確証を得るためTi-Nb合金についても同様の実験を行った.その結果,Ti-Nb合金は温度感受性が高く,42%Nb合金では77Kから373Kの温度範囲内で,14Moの室温から20Moの高温挙動と同等な変形を再現することができた.従って,β型チタン合金の変形挙動はω相やマルテンサイトなどの準安定相の状態に支配され,加工硬化しない現象はω相の応力誘起変態が関与していることを明らかとした.

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  • Formation Mechanism of Fracture Precursor Induced by Phase Transformation in beta Type Ti-Mo Alloy

    Grant number:07650769  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HIDA Moritaka, TAKEMOTO Yoshito, SAKAKIBARA Akira

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    Grant amount:\2400000 ( Direct expense: \2400000 )

    This study has been carried out mainly by electron microscopic observation. The summary is as follows :
    1. It is well known that hardening and embrittlement of beta type Ti-14Mo alloy are caused by aged (1) -phase formation. According to the study on deformation bands formed during tensile test at the aging temperature, the reverse transformation ((1) *beta) in the band drove preferential plastic deformation (work softening) in the band. This was recognized as an origin of the inacroscopic embrittlement. It was also newly observed that the hardness of over-aged alloy decreased without changing (1) -particle size and brittleness. The transition state, (1) *alpha, prepared by a step-aging made the alloy ductile emitting bundles of needle -like alpha-phase into matrix during tensile deformation. The ductility was better than that of the alloy with large alpha-phase formed by direct aging.
    2. It is well known that the as-quenched alloys show remarkable ductility with {332} twinning. The twinning mechanism which had not been cleared was determined by a model simulation of atom displacements to {332} twin from bee structure via alpha" martensitic transformation. Cutting and interaction between {332} twins maybe give rise to the local deformation at a kind of fractural precursors which are expected to be planar (1) -phase. The identification with TEM is now in progress.
    3. In-situ observation on Ti-50.6% Ni shape memory alloy revealed that the deformation in plastic region multiplied the secondary martensitic plates between and/or from the primary ones which were formed during quasi-elastic deformation. Cutting and interaction between the plates led the sample to fracture.
    4. Several cluster models of a given structure (beta, (1), alpha or alpha") were studied with DX-Xalpha method. The bond orders obtained seems to be effective in comparing the strength of stress induced products which stimulate work softening.

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  • 合金ナノ粒子相変態制御を利用した新相材料の創製に関する研究

    Grant number:07750729  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    竹元 嘉利

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    Grant amount:\800000 ( Direct expense: \800000 )

    本研究ではTi合金ナノ粒子をアーク蒸発法によいり作製し,超高分解能分析電子顕微鏡によりその形態,構造について観察を行った.目的組成を有する合金微粒子を得るためには,融点および蒸気圧の影響が大きく左右するためそれらの物性が比較的近いTi-V合金について研究を行ったところ,作製されたナノ粒子はほぼ目的組成を有するものを得ることができた.また,合金組成を簡便に変化させるため,母材にはTiとVの粉末を秤量しその圧粉体を電極として利用した.粒径40nm程度のナノ粒子の電子顕微鏡観察によると,約15%Vの微粒子には焼き入れω相がバリアントを伴って析出していることが,ナノプローブ回折,暗視野像,高分解能像から明らかとなり,焼き入れω相が母相に対してほとんど歪みを与えない整合なものであることが明らかとなった.また,同程度の粒径を持つ10%Vナノ粒子においては,マルテンサイトが微粒子同士の接合領域に認められ,焼き入れω相と比べるとマルテンサイトの方が幾分大きな歪みを伴うことがわかった.これらのことから,Ti合金ナノ粒子の性質はバルクなものとほとんど同じ現象が再現されることがわかった.しかしながら,粒径が30nm以下の超微粒子においては未だω相やマルテンサイトが確認されておらず,この付近にマジックサイズが存在するものと考えられる.また,ナノ粒子に対して熱処理や電子線照射を施すことによって出現するfcc相は酸化が原因であり,たとえ電子顕微鏡内での観察といえども電子線照射中にナノ粒子中の酸素濃度が高まることがEDS分析の結果から明らかとなった.

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  • Ti合金の変形と相変態

    1986

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    Grant type:Competitive

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  • Deformation and Phase Transformation in Ti Alloys

    1986

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    Grant type:Competitive

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  • 析出物周りの微小歪場解析

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    Grant type:Competitive

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  • Study on Interface Structure

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    Grant type:Competitive

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  • Analysis of Fine-Strain Field around Precipitates

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    Grant type:Competitive

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  • 界面構造に関する研究

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    Grant type:Competitive

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