Research Career 【 display / non-display 】

Research Career 【 display / non-display 】

• Deformation and Fracture of Steels

  Project Year：  -   

• Deformation and Farcture of Titanium Alloys

  Grant-in-Aid for Scientific Research  

  Project Year：  -   

• Process and Materials Design in alloys

  The Other Research Programs  

  Project Year：  -   

Books 【 display / non-display 】

Books 【 display / non-display 】

• Handbook of Ecomaterials

  Yoshikazu Shinohara and Osamu Umezawa (Part： Contributor )

  Springer International Publishing  2019.02 ISBN: 978-3-319-68254-9

• Handbook of Ecomaterials

  Osamu Umezawa, Yoshikazu Shinohara, and Kohmei Halada (Part： Contributor )

  Springer International Publishing  2019.02 ISBN: 978-3-319-68255-6

• Standard Microstructures Group 1: Carbon steel & cast irons

  Materials Technology Education Association (Part： Supervisor )

  Yamamoto Scientific Tool Laboratory  2018.06

• Metal, Ceramic and Polymeric Composites for Various Uses

  John Cuppoletti ed. (Part： Joint Work , Range: Ch 4: Thermo-mechanical Treatment of Glass-balloon-dispersed Metal Matrix Composite )

  INTECH  2011.07 ISBN: 978-953-307-3

• Automotive Engineering: Lightweight, Functional, and Novel Materials (Series in Material Science and Engineering)

  Osamu Umezawa (Part： Joint Work )

  Taylor & Francis  2008.02 ISBN: 978-075031001

Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Influence of dispersed β phase on local deformation pattern in mill-annealed Ti-Fe-O alloy under dwell fatigue loading

  Liangwei Yin, Osamu Umezawa

  International Journal of Fatigue   152 ( 106447 )   2021.11  [Refereed]

  Joint Work

  DOI

• Effect of Aging on Low-temperature Tensile Properties of Ultra-low Carbon Steel

  Koga Norimitsu, Kanehira Yuki, Huyen Pham Thi Thanh, Hori Kazuya, Umezawa Osamu

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ ( 一般社団法人 日本鉄鋼協会 )  61 ( 8 )   2308 - 2316   2021.08  [Refereed]

  Joint Work

  　View Summary

  <p>The microstructural changes and low-temperature tensile properties of ultra-low carbon steel aged at 443 K were examined, and the relationship between the low-temperature tensile properties and ultra-low carbon state was discussed. Fine cementites of approximately 60 nm were observed at 0.6 ks and coarsened to approximately 800 nm at 600 ks. The yield and tensile stresses at 77 K increased until 6 ks and then decreased. The nominal stress-strain curves of all the specimens at 77 K exhibited low elastic limits, the nominal stress plateaued from an approximate nominal strain of 0.002 and, subsequently, work hardening occurred. In the unaged and 6 ks aged specimens, several twins were generated after the elastic limit, and which increased dramatically in the nominal stress plateau regime, and corresponded to macroscopic yielding. In contrast, the number of twins in the 600 ks aged specimen negligibly increased during macroscopic yielding. Macroscopic yielding occurred in the unaged and 6 ks aged specimens by deformation twinning, while in the 600 ks aged specimen it occurred by slip deformation. In the 6 ks aged specimen, the fine cementites and/or decrease in solid solute carbon enhanced the critical resolved shear stresses of deformation twinning, resulting in the highest strength. In the 600 ks aged specimen, the coarse cementites negligibly enhanced the critical resolved shear stress for slip deformation. Hence, the strength of the specimen aged for 600 ks decreased as compared to the specimen aged for 6 ks, and slip deformation occurred.</p>

  DOI CiNii

• Microstructural evolution in Ti-37 mol%Nb alloy under uniaxial compression at high temperatures

  Yujiro Hayakawa, Osamu Umezawa

  Journal of Alloys and Compounds   871 ( 159603 )   2021.08  [Refereed]

  Joint Work

  DOI

• Spectroscopy analyses of tribofilm and surface microcracks in carburized SCM420 steel under high-pressure rolling contact fatigue

  Shuto Takayasu, Osamu Umezawa, Keisuke Yari, Kazuya Hashimoto, Taichi Fuchigami

  Wear   477 ( 203807 )   2021.07  [Refereed]

  Joint Work

  DOI

• Work hardening behavior of dual phase copper-iron alloy at low temperature

  Yamashita Takayuki, Koga Norimitsu, Kawasaki Takuro, Morooka Satoshi, Tomono Shohei, Umezawa Osamu, … Show more authors

  MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   819   141509   2021.07  [Refereed]

  Joint Work

  Web of Science DOI

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Review Papers 【 display / non-display 】

Review Papers 【 display / non-display 】

• Review of the mechanical properties of high-strength alloys at cryogenic temperatures

  Osamu Umezawa

  Materials Performance and Characterization   10 ( 2 ) 3 - 15   2021.03  [Refereed]  [Invited]

  Introduction and explanation (scientific journal)   Single Work

  DOI

• A Review of Subsurface Crack Initiation Models in High-cycle Fatigue for Titanium Alloys

  Weibo Li, Osamu Umezawa

  Key Engineering Materials   741   76 - 81   2017.06  [Refereed]  [Invited]

  Introduction and explanation (international conference proceedings)   Joint Work

  DOI

• Visualization of strain distribution on deformed steels using digital image correlation method

  Norimitsu Koga, Osamu Umezawa

  Key Engineering Materials   741   138 - 143   2017.06  [Refereed]  [Invited]

  Introduction and explanation (international conference proceedings)   Joint Work

  DOI

• Critical experiments and analyses at cryogenic temperature to promote a better understanding of mechanical properties in high-strength alloys

  Osamu Umezawa, Kotobu Nagai

  Advances in Cryogenic Engineering-Materials   60   327 - 332   2014.01  [Refereed]  [Invited]

  Introduction and explanation (scientific journal)   Joint Work

  　View Summary

  合金の変形およびき裂形成の金属組織学的検討における極低温環境の有用性について解説した。極低温ではひずみ速度依存性が高まり、内部疲労き裂発生は明瞭かつ加速して観察が可能である。

• Analyses of heterogeneous deformation and subsurface fatigue crack generation in alpha titanium alloy at low temperature

  Osamu Umezawa, Motoaki Morita, Takayuki Yuasa, Satoshi Morooka, Yoshinori Ono, Tetsumi Yuri, Toshio … Show more authors

  Advances in Cryogenic Engineering-Materials   60   34 - 41   2014.01  [Refereed]  [Invited]

  Introduction and explanation (scientific journal)   Joint Work

  　View Summary

  チタン合金の低温高サイクル疲労において{0001}ファセットを起点とする内部き裂発生について従来文献をレビューした。中性子回折実験と完全拘束モデルによる検討につてもまとめ、{0001}開口応力の存在を指摘した。

  DOI

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Industrial Property 【 display / non-display 】

Industrial Property 【 display / non-display 】

• Ultra-fine texture steel and method for producing it

  Patent No 199752

  S. Torizuka, K. Tsuzaki, K. Nagai and O. Umezawa

• Ultra-fine grain steel and method for producing it

  Patent No 6221178

  S. Torizuka, K. Tsuzaki, K. Nagai and O. Umezawa

• Production method of ultra fine grain steel

  Industrial Property No 89103117  Patent No 153034

  S. Torizuka, O. Umezawa, K. Tsuzaki and K. Nagai

• Fine ferrite-based structure steel and production method thereof

  Industrial Property No 09/157,393  Patent No 6572716

  T. Hayashi, S. Torizuka, K. Tsuzaki, K. Nagai and O. Umezawa

• Ultra-fine texture steel and method for producing it

  Industrial Property No 98120620.4  Patent No ZL98120620.4

  S. Torizuka, K. Tsuzaki, K. Nagai and O. Umezawa

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Academic Awards Received 【 display / non-display 】

Academic Awards Received 【 display / non-display 】

• Best Structural Materials Paper

  2019.07.23   International Cryogenic Materials Conference  

  Winner： Norimitsu Koga, Weisi Zhang, Osamu Umezawa, Valentin Tschan, Jan Sas, Klaus-Peter Weiss

• Sawamura Thesis Prize, The Iron and Steel Institute of Japan

  2004.03    

• Tawara Thesis Prize, The Iron and Steel Institute of Japan

  2001.03    

• International Cryogenic Materials Conference, Best Structural Materials Paper 1991

  1993.07    

• Honda Research Promotive Prize, The Honda Memorial Foundation

  1993.05    

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Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2021.04  -  2024.03 

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2016.04  -  2019.03 

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• A Subsurface fatigue crack generation model in near alpha titanium at low temperature

  Osamu Umezawa, Weibo Li

  Thermec 2018  ( Paris)  2018.07.12  

• Growth of ecomaterials and eco-efficiency in major metallic structural materials

  Osamu Umezawa, Yoshikazu Shinohara, Kohmei Halada

  13th International Conference on Ecomaterials 2017 (ICEM13)  (Bangkok, Thailand)  2017.11.20  

• Subsurface Crack Generation Under Rolling Contact Fatigue in Steels

  The First Symposium on Ecomaterials and Processing Technology  2012.10.22  

• Crack Growth Modeling Under Rolling Contact Fatigue

  2012.09  

• Activities in Solid State Materials and Engineering course, Yokohama National University

  4th International Symposium between Yokohama National University and Changwon National University  2012.08.25  

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Past of Collaboration and Commissioned Research 【 display / non-display 】

Past of Collaboration and Commissioned Research 【 display / non-display 】

• International Cooperative Research Project

  International Cooperative Research  

  Project Year： 1993  -  1995 

Social Contribution(Extension lecture) 【 display / non-display 】

Social Contribution(Extension lecture) 【 display / non-display 】

• "

  2019.03

  　

  　

• "

  2018.03

  　

  　

• 13th International Conference on Ecomaterials

  2017.11

  　

  　

• "

  2017.03

  　

  　

• 1st Asian International Cryogenic Materials Conference

  2016.11

  　

  　

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