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Multi-length scale mechanical characterisations towards comprehensive understanding of the microstructure - hydrogen embrittlement relationship

Research Project

Project/Area Number 19H02464
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 26040:Structural materials and functional materials-related
Research InstitutionKumamoto University

Principal Investigator

Mine Yoji  熊本大学, 大学院先端科学研究部(工), 教授 (90372755)

Co-Investigator(Kenkyū-buntansha) 眞山 剛  熊本大学, 先進マグネシウム国際研究センター, 准教授 (40333629)
高島 和希  熊本大学, 国際先端科学技術研究機構, 卓越教授 (60163193)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Keywords強度・破壊靭性
Outline of Research at the Start

準安定オーステナイト系ステンレス鋼の水素脆化を克服できれば、水素システム構造部材の軽量化・レアメタルの省資源化を達成でき、持続可能な社会の実現に大きく貢献できる。この種のステンレス鋼では、変形中に動的に起こる相変態が水素脆化機構の理解を妨げてきた。本研究では、マイクロ力学試験技術を利用して、変形過程における微視組織変化が問題となるオーステナイト鋼の水素脆化機構の解明を行う。特に、水素助長疲労き裂進展を支配する双晶境界の役割と成分偏析による縞状組織の影響に注目する。また、結晶塑性解析と連携させることで、マルチスケールモデリングに基づく材料の耐水素強靭化設計の指導原理の提案を目指す。

Outline of Final Research Achievements

Microtensile tests were performed on nano-twinned 304 stainless steel with hard and soft orientations to determine the effect of nano-twins on hydrogen embrittlement in the metastable austenitic steel. The introduction of nanotwins retarded the typical premature-fracture mode of hydrogen embrittlement, i.e. quasi-cleavage in the soft orientation and twin-boundary separation in the hard orientation, despite significant increases in yield stresses. Microstructure-sensitive fatigue crack growth in 304 steel containing nanotwin bundles was studied using a miniature compact tension specimen combined with post-fatigue metallographic examinations. The nanotwinned specimens exhibited high crack growth resistance compared to the coarse-grained specimen without nanotwin bundles, regardless of lamellar orientation. Increase in crack growth rate due to hydrogen charging was mitigated by the introduction of nanotwins when compared to the single twin boundary specimen.

Academic Significance and Societal Importance of the Research Achievements

材料の微視組織から微小試験片を選択的に採取し、組織構成要素のマイクロ力学特性評価と変形および疲労き裂進展の素過程の直接観察を可能にする手法を利用して、変形過程における微視組織変化が問題となるオーステナイト鋼の水素脆化および水素助長疲労き裂進展を支配する双晶境界の役割を明らかにできた。これにより準安定オーステナイト系ステンレス鋼の水素脆化を克服する糸口を見つけ、水素システム構造部材の軽量化・レアメタルの省資源化を達成でき、持続可能な社会の実現に大きく貢献できる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (22 results)

All 2021 2020 2019 Other

All Int'l Joint Research (6 results) Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] University of Birmingham(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Birmingham(英国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Univerity of Birmingham(英国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Comparative Study of Microstructure-sensitive Fatigue Crack Propagation in Coarse- and Fine-grained Microstructures between Stable and Metastable Austenitic Stainless Steels Using Miniature Specimen2021

    • Author(s)
      Matsushita Aya、Ueki Shohei、Mine Yoji、Takashima Kazuki
    • Journal Title

      ISIJ International

      Volume: 61 Issue: 5 Pages: 1688-1697

    • DOI

      10.2355/isijinternational.ISIJINT-2020-659

    • NAID

      130008038266

    • ISSN
      0915-1559, 1347-5460
    • Year and Date
      2021-05-15
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel2021

    • Author(s)
      Ueki Shohei、Mine Yoji、Lu Xinyu、Chiu Yu Lung、Bowen Paul、Takashima Kazuki
    • Journal Title

      Scripta Materialia

      Volume: 203 Pages: 114045-114045

    • DOI

      10.1016/j.scriptamat.2021.114045

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Enhanced resistance to fatigue crack propagation in metastable austenitic stainless steel by nanotwin bundles2021

    • Author(s)
      Matsushita Aya、Mine Yoji、Takashima Kazuki
    • Journal Title

      Scripta Materialia

      Volume: 201 Pages: 113976-113976

    • DOI

      10.1016/j.scriptamat.2021.113976

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Micro-mechanical characterisation of hydrogen embrittlement in nano-twinned metastable austenitic stainless steel2020

    • Author(s)
      Ueki Shohei、Oura Ryuji、Mine Yoji、Takashima Kazuki
    • Journal Title

      International Journal of Hydrogen Energy

      Volume: 45 Issue: 51 Pages: 27950-27957

    • DOI

      10.1016/j.ijhydene.2020.07.120

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Microstructure-sensitive fatigue crack growth in lath martensite of low carbon steel2020

    • Author(s)
      Shohei Ueki、Yoji Mine、Kazuki Takashima
    • Journal Title

      Materials Science and Engineering: A

      Volume: 773 Pages: 138830-138830

    • DOI

      10.1016/j.msea.2019.138830

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Microstructural fatigue crack growth in single-packet structures of ultra-low carbon steel lath martensite2019

    • Author(s)
      Shohei Ueki、Takuya Matsumura、Yoji Mine、Shigekazu Morito、Kazuki Takashima
    • Journal Title

      Scripta Materialia

      Volume: 173 Pages: 80-85

    • DOI

      10.1016/j.scriptamat.2019.08.004

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 炭素鋼ラスマルテンサイトにおける組織依存疲労き裂伝播の3D-EBSD解析2021

    • Author(s)
      植木翔平, 峯洋二, LU Xinyu, CHIU Yu-Lung, BOWEN Paul, 高島和希
    • Organizer
      日本鉄鋼協会第182回秋季講演大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ナノ双晶SUS304鋼における組織発達に伴う疲労き裂進展2021

    • Author(s)
      峯洋二, 松下彩, 高島和希
    • Organizer
      日本鉄鋼協会第182回秋季講演大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] マイクロ引張試験によるステンレス鋼SUS304の水素誘起双晶界面分離の結晶学的評価2021

    • Author(s)
      植木翔平, 古賀薫, 峯洋二, 高島和希
    • Organizer
      日本鉄鋼協会第181回春季講演大会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 粗大粒および微細粒オーステナイト系ステンレス鋼における短いき裂の進展挙動の調査2020

    • Author(s)
      松下 彩、峯 洋二、高島 和希
    • Organizer
      日本金属学会2020年春期講演大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ハード方位を有するTi-6Al-4Vラメラコロニーにおける微小疲労き裂進展挙動2020

    • Author(s)
      池部 由樹子、峯 洋二、Yu-Lung Chiu、高島 和希
    • Organizer
      日本金属学会2020年春期講演大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Microstructual fatigue crack growth in martensitic steel and titanium alloy with hierarchical structure2020

    • Author(s)
      Y. Mine, K. Takashima
    • Organizer
      International Conference on Plasticity, Damage and Fracture
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 階層的組織材料の組織依存疲労き裂進展挙動2019

    • Author(s)
      峯 洋二、高島和希
    • Organizer
      日本金属学会研究会 微小領域の力学特性評価とマルチスケールモデリング
    • Related Report
      2019 Annual Research Report
  • [Presentation] Micro-mechanical characterisation of hydrogen-induced twin boundary separation in type 304 stainless steel under tensile loading2019

    • Author(s)
      S. Ueki, Y. Mine, K. Takashima
    • Organizer
      EUROMAT2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystallographic study of microstructurally-short fatigue crack growth in Ti-6Al-4V lamellar alloy2019

    • Author(s)
      Y. Ikebe, Y. Mine, Y.L. Chiu, P. Bowen, K. Takashima
    • Organizer
      EUROMAT2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 熊本大学先端材料学研究室

    • URL

      http://www.msre.kumamoto-u.ac.jp/~sentan/

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report 2019 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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