UMEZAWA Osamu

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Research Fields, Keywords

Deformation and Fracture, Microstructure of Metals and Alloys

Mail Address

E-mail address

Related SDGs




ORCID  https://orcid.org/0000-0003-0380-1885

The Best Research Achievement in the last 5 years 【 display / non-display

Graduating School 【 display / non-display

  •  
    -
    1986.03

    Waseda University   Department of Science and Engineering   Metallurgical Engineering   Graduated

Degree 【 display / non-display

  • Doctor of Engineering -  Waseda University

Campus Career 【 display / non-display

  • 2017.04
    -
    Now

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2006.04
    -
    2017.03

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Professor  

  • 2001.11
    -
    2006.03

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2019.04
    -
    Now

    Concurrently   Yokohama National UniversityInstitute of Advanced Sciences   Center for Creation of Symbiosis Society with Risk   Professor  

  • 2019.04
    -
    2023.03

    Concurrently   Yokohama National UniversityFaculty of Engineering   Dean  

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External Career 【 display / non-display

  • 2019.01
    -
    2023.12

    Vysoká Škola Báňská - Technical University of Ostrava   Senior researcher  

  • 2001.04
    -
    2001.10

    National Institute for Materials Science   Senior Researcher  

  • 1996.04
    -
    2001.03

    National Institute for Metals, Sience and Technology Agency   Senior Researcher  

  • 1993.10
    -
    1995.03

    University of Cambridge   Department of Materials Science and Metallurgy   Visiting Fellow  

  • 1993.10
    -
    1995.03

    Japan Research and Development Corporation   Researcher  

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Academic Society Affiliations 【 display / non-display

  • 1986.01
     
     
     

    The Iron and Steel Institute of Japan

  • 1986.01
     
     
     

    Japan Institute for Metals

  • 2001.12
     
     
     

    Ecomaterials Forum

  • 1998.07
     
     
     

    Japan Institute for Light Metals

  • 1989.01
    -
    2011.12
     

    The Minerals, Metals and Materials Society

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Structural/Functional materials

  • Material processing/Microstructural control engineering

  • Materials/Mechanics of materials

  • Environmental engineering and reduction of environmental burden

 

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

  • 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

  • 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 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

  • 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

  • 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(C)

    Project Year: 2021.04  -  2024.03 

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

    Project Year: 2016.04  -  2019.03 

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

  • International Cooperative Research Project

    International Cooperative Research  

    Project Year: 1993  -  1995 

 

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

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    2019.03
     
     

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    2018.03
     
     

  • 13th International Conference on Ecomaterials

    2017.11
     
     

  • "

    2017.03
     
     

  • 1st Asian International Cryogenic Materials Conference

    2016.11
     
     

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