| Project/Area Number |
25420006
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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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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Ibaraki University |
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Principal Investigator |
Konosu Shinji 茨城大学, 工学部, 名誉教授 (90091686)
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| Co-Investigator(Kenkyū-buntansha) |
HORIBE TADASHI 茨城大学, 工学部, 教授 (50141867)
MORI KOTARO 茨城大学, 工学部, 助授 (40712740)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 水素脆化 / 破壊力学 / 水素助長割れ進展 / 破壊じん性 |
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| Outline of Final Research Achievements |
By focusing attention on the effects of trace elements on hydrogen embrittlement sensitivity for iron-based materials, the thermal desorption analysis and electro probe microanalysis were conducted. A number of dispersed vanadium carbides caused by the addition of roughly 0.3 wt.% vanadium is effective in mitigating hydrogen embrittlement, while the reduction of impurity elements such as phosphorus and tin has little impact on threshold for hydrogen-induced fracture. For a structural integrity assessment, the mechanical characteristics such as threshold stress intensity factors at the onset of hydrogen-assisted crack growth, KIH, the tearing resistance, dJ/da and subcritical crack growth rates at constant loads, da/dt need to be known. In this study, the newly developed offset potential-drop method was employed to clarify these properties for 2.25Cr-1Mo steels with trace element controls.
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