| Project/Area Number |
25820003
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tohoku University |
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Principal Investigator |
OHMI Toshihito 東北大学, 工学(系)研究科(研究院), 助教 (90586489)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 水素脆化 / 疲労破壊 / 数値解析 / ステンレス鋼 / 拡散 / 濃度分布 / 疲労 / 加工効果 |
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| Outline of Final Research Achievements |
Hydrogen penetrates in the material as an atom and causes the hydrogen embrittlement. However the mechanism of hydrogen embrittlement has not been clarified yet. This may be due to the difficulty of experimental detection of hydrogen distribution. Furthermore, fracture morphology depends on the material, the environment and load condition.
In this study, hydrogen distribution in the material was estimated by a numerical analysis. Moreover, hydrogen embrittlement tests under fatigue condition were conducted using hydrogen charged specimens. For fatigue tests, the stainless steel was used. On the basis of these results, the relationship between the hydrogen concentration behavior and the hydrogen embrittlement behavior was clarified. Additionally, the sensitivity of hydrogen embrittlement was estimated quantitatively based on crack growth rate and fracture morphology by fractography.
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