2022 Fiscal Year Final Research Report
Quantitative evaluation for hydrogen-induced reduction of cohesive energy through micromechanics analysis
| Project/Area Number |
19H02459
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | National Institute for Materials Science (2020-2022)
Kyoto University (2019) |
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Principal Investigator |
Shibata Akinobu 国立研究開発法人物質・材料研究機構, 構造材料研究拠点, グループリーダー (60451994)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 水素脆性 / マルテンサイト鋼 / 破壊靭性 / マイクロメカニックス |
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| Outline of Final Research Achievements |
This study investigated hydrogen-related fracture of steels to quantitatively clarify the relationship between hydrogen and fracture properties on atomic and microscopic scales. We found that crack growth resistance decreases with increasing hydrogen concentration, but still exists even at very high hydrogen concentrations of 4 wt. ppm. This kind of stable crack propagation is attributed to the microscopic discontinuous crack propagation. The FE simulation results proved that the crack propagation morphology has a significant influence on the macroscopic mechanical response.
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| Free Research Field |
材料組織学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，水素誘起粒界凝集エネルギー低下の定量評価を行った．破壊特性精密評価，ミクロ組織解析，マイクロメカニックス解析を併せた新規な複合的手法によって水素脆性破壊の定量評価を実施した点に本研究の大きな学術的意義がある．水素脆性は高強度鉄鋼材料を広く社会実装していく上で大きな問題となっている．本研究で得られた知見は耐水素脆性に優れた材料設計に繋がるものであるため，安全・安心な社会を構成するための社会基盤の構築に貢献しうるものである．
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