2023 Fiscal Year Final Research Report
Investigation into Mechanism of Damage Detection with Hydrogen and Development of Innovative Materials Diagnosis Technique
| Project/Area Number |
21K04694
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Kagoshima University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 水素 / クリープ / 低サイクル疲労 / 欠陥 / 非破壊評価 / 余寿命評価 / 水素昇温脱離分析 |
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| Outline of Final Research Achievements |
In order to clarify the mechanism of damage detection by hydrogen (interaction between hydrogen and damage), the changes in hydrogen desorption characteristics of 8%Cr ferritic steel with fatigue and creep damage accumulations were investigated in detail. As a result, hydrogen attributable to vacancy and vacancy cluster, which was likely to be closely associated with cyclic deformation (fatigue damage), was successfully separated from the measured hydrogen evolution curve. Additionally, hydrogen, which seemed to originate from creep damage, could be also extracted from measured hydrogen evolution curve, and it was found that the remaining-creep life could be predicted based on the amount of the desorbed hydrogen.
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| Free Research Field |
環境j強度学
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| Academic Significance and Societal Importance of the Research Achievements |
得られた結果により，疲労損傷およびクリープ損傷と水素の相互作用がより一層明確になった．水素をトレーサーに用いた本手法を材料診断技術として確立することができれば，経済的損失や環境汚染だけでなく人命にも係わる大型機器・構造物の破壊事故の未然防止に貢献するだけではなく，過度の猶予を残した状態でのリプレースや廃却を減らすことが可能となる．さらには，我が国における産業技術基盤の独創的な充実を促す波及効果を生み，産業界において広い応用展開が期待される材料評価の基盤技術に繋がるものと期待される．
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