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Affiliation |
Faculty of Engineering, Division of Systems Research |
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Job Title |
Professor |
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Research Fields, Keywords |
極低温特性, Microstructure of Metals and Alloys, Fracture, 疲労, Deformation |
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Mail Address |
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Related SDGs |
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UMEZAWA Osamu
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ORCID
The Best Research Achievement in Research Career 【 display / non-display 】
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【Published Thesis】 Microstructural evolution in Ti-37 mol%Nb alloy under uniaxial compression at high temperatures(Journal of Alloys and Compounds) 2021.08
【Published Thesis】 ISIJ International 2022.03
【Published Thesis】 Influence of dispersed β phase on local deformation pattern in mill-annealed Ti-Fe-O alloy under dwell fatigue loading(International Journal of Fatigue) 2021.11
The Best Research Achievement in the last 5 years 【 display / non-display 】
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【Published Thesis】 Fracture toughness and martensitic transformation in type 316LN austenitic stainless steel extra-thick plates at 4.2 K(Materials Science and Engineering A) 2023.01
【Published Thesis】 Tribofilm properties and microcrack morphologies for a carburized SCM420 steel under high-pressure rolling sliding contact fatigue with lubricants containing high sulfur- and phosphorus- additives”(WEAR) 2022.08
【Published Thesis】 ISIJ International 2022.03
【Published Thesis】 Influence of dispersed β phase on local deformation pattern in mill-annealed Ti-Fe-O alloy under dwell fatigue loading(International Journal of Fatigue) 2021.11
【Published Thesis】 Microstructural evolution in Ti-37 mol%Nb alloy under uniaxial compression at high temperatures(Journal of Alloys and Compounds) 2021.08
Education 【 display / non-display 】
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-1986.3
Waseda University Metallurgical Engineering Graduated
Degree 【 display / non-display 】
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Doctor of Engineering - Waseda University
Campus Career 【 display / non-display 】
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2017.4
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Professor
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2006.4-2017.3
Duty Yokohama National UniversityFaculty of Engineering Division of Materials Science and Chemical Engineering Professor
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2001.11-2006.3
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Associate Professor
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2023.4
Concurrently Yokohama National UniversityInstitute for Multidisciplinary Sciences Professor
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2019.4
Concurrently Yokohama National UniversityInstitute of Advanced Sciences Center for Creation of Symbiosis Society with Risk Professor
External Career 【 display / non-display 】
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2022.4
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2019.1-2023.12
Vysoká Škola Báňská - Technical University of Ostrava Senior researcher
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2001.4-2001.10
National Institute for Materials Science Senior Researcher
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1996.4-2001.3
National Institute for Metals, Sience and Technology Agency Senior Researcher
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1993.10-1995.3
University of Cambridge Department of Materials Science and Metallurgy Visiting Fellow
Academic Society Affiliations 【 display / non-display 】
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2008.6
日本熱処理技術協会
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2001.12
Ecomaterials Forum
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1998.7
Japan Institute for Light Metals
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1986.1
Japan Institute for Metals
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1986.1
The Iron and Steel Institute of Japan
Research Areas 【 display / non-display 】
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Nanotechnology/Materials / Structural materials and functional materials
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Nanotechnology/Materials / Material processing and microstructure control
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials
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Environmental Science/Agriculture Science / Environmental load reduction and remediation
Research Career 【 display / non-display 】
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Deformation and Fracture of Steels
Project Year：
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Deformation and Farcture of Titanium Alloys
Grant-in-Aid for Scientific Research
Project Year：
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Process and Materials Design in alloys
The Other Research Programs
Project Year：
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表面硬化部材の疲労き裂形成
Project Year：
Books 【 display / non-display 】
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金属組織観察のための検鏡試料の作り方
梅澤修（ Role： Supervisor (editorial)）
大河出版 （ ISBN:978-4-88661-818-4 ）
Language：Japanese Book type：Scholarly book
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Handbook of Ecomaterials
Yoshikazu Shinohara and Osamu Umezawa（ Role： Contributor）
Springer International Publishing （ ISBN:978-3-319-68254-9 ）
Responsible for pages：961-966 Language：English Book type：Scholarly book
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Handbook of Ecomaterials
Osamu Umezawa, Yoshikazu Shinohara, and Kohmei Halada（ Role： Contributor）
Springer International Publishing （ ISBN:978-3-319-68255-6 ）
Responsible for pages：2261-2280 Language：English Book type：Scholarly book
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Standard Microstructures Group 1: Carbon steel & cast irons
Materials Technology Education Association（ Role： Supervisor (editorial)）
Yamamoto Scientific Tool Laboratory
Language：English Book type：Scholarly book
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改訂版 金属組織の現出と試料作製の基本
材料技術教育研究会 (編集) （ Role： Contributor , 全編の編集と校正、および11章のEBSD分析および三次元化に必要な試料調整ついて解説した。）
大河出版 （ ISBN:9784886618177 ）
Total pages：303 Language：Japanese Book type：Scholarly book
編集代表者として全体の取りまとめと、11章「機器分析用研磨面作成の留意点」の11.4節「SEM-EBSD解析のための試料作製について」と11.5節「シリアルセクショニング法による三次元画像再構築」pp.285-290を分担執筆した。
Thesis for a degree 【 display / non-display 】
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高強度非磁性金属材料の極低温高サイクル疲労破壊の研究
梅澤 修
1992.10
Doctoral Thesis Single Work [Reviewed]
早稲田大学大学院理工学研究科 第1835号, 文部省 乙第901号
高強度非磁性金属材料であるチタン合金とオーステナイト鋼の高サイクル疲労をはじめとした極低温特性を評価するとともに、極低温高サイクル疲労破壊において顕在化する内部き裂発生に着目し、電子顕微鏡を用いて転位組織の発達と微小き裂および破面形成過程を詳細に解析し、高強度材料における不均一変形と組織依存によるき裂形成の基本的なモデルを提示した。
Papers 【 display / non-display 】
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Enhanced work hardening in ferrite and austenite of duplex stainless steel at 200 K: In situ neutron diffraction study
Takayuki Yamashita, Norimitsu Koga, Mao Wenqi, Wu Gong, Takuro Kawasaki, Stefanus Harjo, Hidetoshi … Show more authors
Takayuki Yamashita, Norimitsu Koga, Mao Wenqi, Wu Gong, Takuro Kawasaki, Stefanus Harjo, Hidetoshi Fujii, Osamu Umezawa Hide authors
Materials Science and Engineering A 941 148602 - 148602 2025.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Influence of prior quenching and tempering treatment on cementite formation during nitriding at 913 K for SCM440 steel
Kim Minheon, Umezawa Osamu
ISIJ International 65 ( 7 ) 982 - 991 2025.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 日本鉄鋼協会 Joint Work
<p>This study investigated the mechanism of cementite formation in JIS-SCM440 low-alloy steel subjected to high-temperature nitriding (NH) at 913 K, followed by quenching and aging. Specimens with and without prior quenching and tempering (QT) treatment were analyzed to understand the influence of the initial microstructures on cementite precipitation. Comprehensive characterization using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), and electron probe microanalysis (EPMA) revealed that NH treatment promoted significant nitrogen diffusion into the steel matrix, resulting in the formation of a nitrogen compound layer and a hardened nitrogen martensite layer beneath the compound layer. In the NH specimens following QT treatment (QTNH), accelerated carbon diffusion to the surface led to cementite precipitation around the surface pores owing to the dissolution of fine carbides. Cementite enhanced the surface hardness of the porous regions compared to that of the NH specimens.</p>
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Effects of β phase and initial dislocation density on dwell fatigue deformation and crack initiation mechanism in Ti-5Al-2Fe-3Mo alloy
Daiki Miyashita, Yusuke Nakao, Osamu Umezawa
Materials Science and Engineering A 924 147852 2025.2 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Maruyama Takashi, Umezawa Osamu
Tetsu-to-Hagane 111 ( 2 ) 32 - 40 2025.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Iron and Steel Institute of Japan Joint Work
<p>Nitriding is a beneficial surface hardening heat treatment to reduce CO<sub>2</sub> emissions and shows a potential partially replace carburized steels adopted for sliding parts such as bearings and gears. Both the bending fatigue strength and pitting fatigue strength under high contact pressure were evaluated for nitrided JIS-SCM440H materials using two types of controlled-nitridings, i.e. γ' and e, and conventional gas nitriding. Not only the thickness of the compound layer but also its phase structure such as γ' and e significantly affected the 10<sup>7</sup> cycles bending fatigue strength, where the γ'-nitrided material was the highest. On the other hand, almost no effects of the thickness and phase structure on the 10<sup>7</sup> cycles pitting fatigue strength were detected in the materials. Compared to the carburized material, the γ'-nitrided material exhibited higher 10<sup>7</sup> cycles fatigue strength in bending and pitting, but poor fatigue strength in the lower cycles range. The shape and size of the pores in the compound layer were altered during roller-pitching tests, although there was almost no reduction in the thickness of the compound layer. The pore size was reduced by pore closure, especially at higher contact pressures. Pore closure was more pronounced in the γ'-nitrided materials than in the ε-nitrided materials at lower contact pressures. The 10<sup>7</sup> cycles pitting fatigue strength was improved after the pore closure, resulting from fewer defects.</p>
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Influence of carbonitriding and sub-zero treatment on the microstructure and fatigue strength of JIS-SCM420 low-alloy steel
Kim Minheon , Umezawa Osamu
Materials Science and Engineering A 923 147751 2025.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Review Papers 【 display / non-display 】
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鋼の焼入性と合金元素〜合金鋼の焼入焼戻を知る基礎知識〜
梅澤修
熱処理技術セミナー（2024年度第3回） 1 - 8 2024.12
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Lecture material (seminar, tutorial, course, lecture, etc.) Single Work
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Crack Generation in Rolling-sliding Contact Fatigue for High Strength Martensitic Steels
Umezawa Osamu
Materia Japan 63 ( 11 ) 780 - 787 2024.11 [Reviewed] [Invited]
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：The Japan Institute of Metals and Materials Single Work
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鋼の焼入性と合金元素
梅澤修
熱処理技術セミナー（2023年度第3回） 1 - 8 2023.11
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Lecture material (seminar, tutorial, course, lecture, etc.) Single Work
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鋼の焼入焼戻しにおける合金元素の役割をみてみよう
梅澤修
金属 93 ( 6 ) 452 - 458 2023.6
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Single Work
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鋼の焼入性と合金元素
梅澤修
熱処理技術セミナー（2022年度第3回） 1 - 8 2022.11
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Lecture material (seminar, tutorial, course, lecture, etc.) Single Work
Industrial Property Rights 【 display / non-display 】
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チタン合金およびチタンからなる基体とその表面処理方法
梅澤 修
Applicant：横浜国立大学
Application no：2011-215240 Date applied：2011.9.29
Country of applicant：Domestic
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鋳物用アルミニウム合金
大澤嘉昭，高森 晋，皆川和己，垣澤英樹，梅澤 修，原田幸明
Applicant：物質・材料研究機構
Application no：2007-058303 Date applied：2007.3.8
Patent/Registration no：4551995 Date issued：2010.7.23
Country of applicant：Domestic
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Al-Si系合金の製法
梅澤 修
Applicant：よこはまティエルオー
Application no：2003-378043 Date applied：2003.11.7
Patent/Registration no：4103959 Date issued：2008.4.4
Country of applicant：Domestic
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アルミニウム系鋳造合金の凝固結晶組織を制御する方法
大澤嘉昭，高森 晋，皆川和己，垣澤英樹，梅澤 修，原田幸明
Applicant：物質・材料研究機構
Application no：2002-379104 Date applied：2002.12.27
Country of applicant：Domestic
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高燐鋼板製造装置及び高燐鋼板製造方法
中嶋 宏，高谷英明，梅澤 修，平田耕一
Applicant：三菱重工業
Application no：2001-280468 Date applied：2001.9.14
Patent/Registration no：3549000 Date issued：2004.4.30
Country of applicant：Domestic
Awards 【 display / non-display 】
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日本金属学会 論文賞
2023.9 日本金属学会 Preferential dynamic grain growth mechanism enabling the control of microstructure and texture by high temperature deformation: experimental evidence and applicability
Individual or group name of awards：福富洋志, 岡安和人, 小貫祐介, 長谷川誠, 小林郁夫, Bohumir Strnadel, 梅澤修
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International Science and Technology Awards 2022
2022.11 International Society for Science Network
Individual or group name of awards：Osamu Umezawa
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IAAM Scientist Medal
2022.10 Advanced Materials World Congress
Individual or group name of awards：Osamu Umezawa
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学術功績賞（林賞）
2020.6 一般社団法人 日本熱処理技術協会 ひずみ不整に起因するき裂形成機構と組織学的要因との関係解明
Individual or group name of awards：梅澤 修
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High Quality Paper Award
2019.11 The 25th Small Engine Technology Conference (SETC2019) Influence of Surface Compound Layer on Fatigue Strength of Nitrided Chromium Molybdenum Steel
Individual or group name of awards：Tsuyoshi Kubota, Osamu Umezawa
Grant-in-Aid for Scientific Research 【 display / non-display 】
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浸窒処理を用いた表面硬化部材の疲労き裂形成と硬化層組織との関係
2024.4 - 2027.3
Grant-in-Aid for Scientific Research(C)
Investigator(s)：梅澤修
Authorship：Principal investigator Grant type：Competitive
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極低温用構造材料厚肉材の高強度化と耐き裂形成に優れる金属組織制御法の開発
2021.4 - 2024.3
科学研究費補助金 Grant-in-Aid for Scientific Research(C)
Grant type：Competitive
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転位の集団運動とひずみ不整合に着目した内部疲労き裂形成の解明
2016.4 - 2019.3
科学研究費補助金 Grant-in-Aid for Scientific Research(C)
Investigator(s)：梅澤 修
Grant type：Competitive
Other external funds procured 【 display / non-display 】
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極限環境対応構造材料研究拠点
2022.10 - 2031.3
Ministry of Education, Culture, Sports, Science and Technology データ創出・活用型 マテリアル研究開発プロジェクト
Authorship：Coinvestigator(s)
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水素ガスを使った加圧ガス冷却式真空浸炭炉の開発
2021.10 - 2024.3
Ministry of Economy, Trade and Industry 令和3年度戦略的基盤技術高度化支援事業
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破壊に強い延性二相チタン合金の組織設計原理の確立
2020.4 - 2023.3
Private Foundations 研究プロジェクト
Authorship：Coinvestigator(s)
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鋼中炭素の存在状態評価と微小球反発硬さ試験法の適用開発
2019.4 - 2020.3
Private Foundations 単年度研究助成
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原型炉超伝導TFコイルに向けた極低温用構造材料の高強度化に関する研究開発
2018.11 - 2020.3
Other Ministries 委託研究
Investigator(s)：梅澤 修
Presentations 【 display / non-display 】
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A Subsurface fatigue crack generation model in near alpha titanium at low temperature
Osamu Umezawa, Weibo Li
Thermec 2018
Event date： 2018.7
Language：English Presentation type：Oral presentation (general)
Venue： Paris
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Growth of ecomaterials and eco-efficiency in major metallic structural materials
Osamu Umezawa, Yoshikazu Shinohara, Kohmei Halada
13th International Conference on Ecomaterials 2017 (ICEM13)
Event date： 2017.11
Language：English Presentation type：Oral presentation (invited, special)
Venue：Bangkok, Thailand
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グリーンモノづくりの課題とアジアの役割
第11回エコマテリアル国際会議プレシンポジウム—日本発のモノづくり：東南アジア（ベトナム）展開への期待—
Event date： 2013.3
Language：The in addition, foreign language Presentation type：Oral presentation (invited, special)
Venue：東京
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Subsurface Crack Generation Under Rolling Contact Fatigue in Steels
The First Symposium on Ecomaterials and Processing Technology
Event date： 2012.10
Language：The in addition, foreign language Presentation type：Oral presentation (invited, special)
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Crack Growth Modeling Under Rolling Contact Fatigue
Event date： 2012.9
Language：The in addition, foreign language Presentation type：Oral presentation (general)
Preferred joint research theme 【 display / non-display 】
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多結晶金属の不均一変形とき裂発生モデリング
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不均一変形材料の疲労破壊
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軽量・難加工金属の高付加価値化成形
Past of Collaboration and Commissioned Research 【 display / non-display 】
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極限環境対応構造材料研究拠点
Offer organization: 東北大学 Funded Research on Investiment
Project Year： 2022.10 - 2025.3
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破壊に強い延性二相チタン合金の組織設計原理の確立
Offer organization: 日本鉄鋼協会 Cooperative Research within Japan
Project Year： 2020.4 - 2023.3
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表面硬化部材の疲労損傷研究部会
Cooperative Research within Japan
Project Year： 2019.4 - 2022.3
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表面硬化部材の疲労損傷研究部会
Cooperative Research within Japan
Project Year： 2017.3 - 2019.3
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鉄鋼のミクロ組織要素と特性の量子線解析研究会
Offer organization: 日本鉄鋼協会 Others
Project Year： 2017.2 - 2020.1
Charge of on-campus class subject 【 display / non-display 】
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2025 Off-Campus Exercise in Materials Engineering
Graduate school of Engineering Science
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2025 Advanced Study in Materials Engineering
Graduate school of Engineering Science
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2025 Sub-research exercise in Materials Engineering
Graduate school of Engineering Science
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2025 International Internships in Materials Engineering
Graduate school of Engineering Science
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2025 Crystal Plasticity
College of Engineering Science
Charge of off-campus class subject 【 display / non-display 】
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材料学特論II
Institution：東海大学
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基礎結晶科学
Institution：横浜市立大学
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材料設計と評価技術の最前線
Institution：東京工業大学
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金属工学特別講義第一
Institution：東京工業大学
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鉄と鋼の材料技術
Institution：放送大学
Committee Memberships 【 display / non-display 】
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国際宇宙ステーション・きぼう利用推進に係るきぼう利用テーマ選考評価委員会（物質・物理科学）
2024.6 - 2027.3 委員
Committee type：Government
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International Scientific Advisory Board of Materials and Technologies for Sustainable Development
2023.10
Committee type：Other
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International Scientific Advisory Board
2023.7
Committee type：Other
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Net Zero Initiative Scientific Advisory Board
2023.4 - 2026.3
Committee type：Other
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液化水素関連材料評価基盤の整備運営委員会
2022.4 委員長
Committee type：Government
Social Contribution(Extension lecture) 【 display / non-display 】
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28th IFHTSE Congress
2023.11
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15th International Conference on Ecomaterials
2022.11
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9th New Methods of Damage and Failure Analysis of Structural Parts
2022.9
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2022.3
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2021.3