Faculty Profiles - TAKEMOTO Yoshito

Papers - TAKEMOTO Yoshito

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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

Journal of the Japan Institute of Metals and Materials 88 ( 12 ) 324 - 330 2024.12

Reverse Shape Memory Effect and Toughness Recovery of Ti-10V-2Fe-3Al Alloy Reviewed

Yoshito Takemoto, Daiki Shinomiya, Taiki Ishihara, Hiroto Yokota, Jinta Arakawa

Journal of the Japan Institute of Metals and Materials 88 ( 10 ) 239 - 244 2024.10

Crystal plasticity analysis of fatigue crack initiation site considering crystallographic orientation in Ti–22V–4Al alloy Reviewed

Jinta Arakawa, Koki Hirazumi, Takeshi Uemori, Yoshito Takemoto

23 2024.9

Elucidation of small fatigue crack initiation and propagation behavior on polycrystal Ti-22V-4Al Reviewed

Jinta Arakawa, Koki Hirazumi, Takeshi Uemori, Yoshito Takemoto

Procedia Structural Integrity 66 38 - 48 2024.9

Testing Method and Design Guideline of Unit Cell Shape of Cellular Structures Made of AZ31 Magnesium Alloy Considering Application to Coronary Stent Reviewed

Ichiro SHIMIZU, Shunpei UEDA, Akira WADA, Tomoya KAGOTANI, Yoshito TAKEMOTO

Advanced Experimental Mechanics 2024.6

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

TITANIUM JAPAN 71 ( 3 ) 204 - 207 2023.7

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

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

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

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

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

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

Ichiro SHIMIZU, Yoshito TAKEMOTO

Advanced Experimental Mechanics 7 65 - 70 2022.8

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

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

MATERIALS TRANSACTIONS 63 ( 4 ) 489 - 496 2022.4

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

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

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

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

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

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

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

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

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

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

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

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

ISIJ International 61 ( 4 ) 1300 - 1308 2021

Publishing type：Research paper (scientific journal)

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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Papers - TAKEMOTO Yoshito