UMEZAWA Osamu

Organization

Faculty of Engineering, Division of Systems Research

Title

Professor

Research Fields, Keywords

Deformation and Fracture, Microstructure of Metals and Alloys

Mail Address

E-mail address



Graduating School 【 display / non-display

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    -
    1986.03

    Waseda University   Department of Science and Engineering   Metallurgical Engineering   Graduated

Degree 【 display / non-display

  • Doctor (Enginering) -  Waseda University

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

  • 2001.12
     
     
     

    Ecomaterials Forum

  • 1998.07
     
     
     

    Japan Institute for Light Metals

  • 1989.01
    -
    2011.12
     

    The Minerals, Metals and Materials Society

  • 1986.01
     
     
     

    Japan Institute for Metals

  • 1986.01
     
     
     

    The Iron and Steel Institute of Japan

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

  • Process and Materials Design in alloys

    The Other Research Programs  

    Project Year:  -   

  • Deformation and Fracture of Steels

    Project Year:  -   

  • Deformation and Farcture of Titanium Alloys

    Grant-in-Aid for Scientific Research  

    Project Year:  -   

Books 【 display / non-display

  • Handbook of Ecomaterials

    Yoshikazu Shinohara and Osamu Umezawa (Part: Contributor )

    Springer International Publishing  2019 ISBN: 978-3-319-68254-9

  • Handbook of Ecomaterials

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

    Springer International Publishing  2019 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

  • Mechanism of Texture and Microstructure Evolution during High Temperature Plane Strain Compression in AZ31B and AZ80 Magnesium Alloys with Various Initial Textures

    Fukutomi Hiroshi, Park Hyung-Gyun, Kim Kwon-Hoo, Okayasu Kazuto, Hasegawa Makoto, Umezawa Osamu

    Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials )  83 ( 8 )   264 - 272   2019.08  [Refereed]

    Joint Work

     View Summary

    <p>The effects of pre-existent textures on the evolution behaviors of microstructure and texture at high-temperature plane strain compression deformation of AZ31B magnesium alloy have been studied. Deformation is conducted at 723 K with a strain rate of 5.0 × 10<sup>−2</sup> s<sup>−1</sup>, up to −1.3 in true strain. When non-basal slip systems are the primary slip systems, {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> texture develops. In this case, repeated change in microstructure and texture which was found in the previous work appeared with increasing strain. Namely, replacement of {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> texture with {10<span style="text-decoration: overline;">1</span>0}<11<span style="text-decoration: overline;">2</span>0> texture and the reverse phenomenon occurs. While the {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> oriented grains are small and with wavy shaped grain boundaries, the {10<span style="text-decoration: overline;">1</span>0}<11<span style="text-decoration: overline;">2</span>0> oriented grains are large and with rather straight grain boundaries. The mechanism of repeated change in microstructure and texture is discussed on the basis of preferential dynamic grain growth mechanism proposed by the authors.</p>

    DOI CiNii

  • Effect of pearlite volume fraction on two-step ductile to brittle transition in ferrite + pearlite structure steel sheets

    Hiroyuki Kawata, Osamu Umezawa

    ISIJ International ( 一般社団法人 日本鉄鋼協会 )  59 ( 7 )   1344 - 1353   2019.07  [Refereed]

    Joint Work

     View Summary

    <p>Multi structural steels exhibit high strength and good formability; however, their performance depends on the volume fraction of the secondary phase. In our previous study, ferrite + pearlite structural steel sheet showed the characteristic two-step ductile-to-brittle transition (DBT) with decreasing temperature, and the absorbed energy curve exhibited a distinct middle shelf. In this study, we evaluated the effect of pearlite volume fraction (<i>V</i><sub>P</sub>) on the DBT behavior by the Charpy impact test with sub-size specimens. For specimens without pearlite, the absorbed energy directly dropped from the upper shelf to the lower shelf with decreasing temperature. For samples with 2–3% pearlite, the absorbed energy corresponding to the transition temperature range was dispersed between the two shelves, and the transition behavior seemed to be the typical DBT behavior. When <i>V</i><sub>P</sub> was increased to 21%, the absorbed energy just above the transition-finish temperature became stable at a middle level between the two shelves; thus, the existence of a distinct middle shelf was confirmed. Although the transition-start temperature increased with increasing <i>V</i><sub>P</sub>, <i>V</i><sub>P</sub> did not affect the transition-finish temperature and the absorbed energy at the middle shelf. These results were analyzed with a simple model based on the Yoffee diagram.</p>

    DOI CiNii

  • Crystal orientation analysis on stress corrosion cracking facets in austenitic stainless steels

    Ryo Wakinaga, Norimitsu Koga, Osamu Umezawa, Motoaki Morita, Shinichi Motoda, Tadashi Shinohara

    Key Engineering Materials   810   64 - 69   2019.07  [Refereed]  [Invited]

    Joint Work

    DOI

  • Crystal lattice rotation and fatigue crack generation in aluminum wire under cyclic bending deformation

    Hayato Iketani, Osamu Umezawa, Hiroshi Fukutomi

      69 ( 6 )   302 - 308   2019.06  [Refereed]

    Joint Work

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

    Osamu Umezawa, Weibo Li

    Materials Science Forum   941   1336 - 1341   2018.12  [Refereed]  [Invited]

    Joint Work

    DOI

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Review Papers 【 display / non-display

  • 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 Ogata

    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

  • Ecomaterials in the global eco-society: present situation and future prospects

    O. Umezawa, K. Halada, K. Shinohara

    Materials Science Forum   555   1 - 7   2007

    Introduction and explanation (bulletin of university, research institution)   Joint Work

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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: 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
     
     

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    2017.03
     
     

  • 7th New Methods of Damage and Failure Analysis of Structural Parts

    2016.11
     
     

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