2013 Fiscal Year Final Research Report
Role of Grain Boundary in Stress Corrosion Cracking based upon Elastic-Plastic Fracture Machanics
| Project/Area Number |
23560078
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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 | Tohoku University |
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Principal Investigator |
LU Zhanpeng 東北大学, 未来科学技術共同研究センター, 客員教授 (30419999)
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| Co-Investigator(Kenkyū-buntansha) |
SHOJI Tetsuo 東北大学, 未来科学技術共同研究センター, 教授 (80091700)
TAKEDA Yoichi 東北大学, 大学院工学研究科, 准教授 (40374970)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 弾塑性 / 応力腐食割れ / 環境強度 / 結晶粒界 / 高温水 |
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| Research Abstract |
Stress corrosion cracking growth rates of Alloy 182 weld metals in T-S and T-L orientations in 288oC pure water with various dissolved oxygen and hydrogen concentrations were measured. High angle random boundaries are dominant in Alloy 182. Extensive inter-dendritic stress corrosion cracking paths on the side surfaces and fracture surfaces of both T-S and T-L orientation specimens. Crack growth rates of the T-S specimen are significantly higher than those of the T-L specimen. The crack growth path in the T-S orientation specimen is apparently perpendicular to the applied loading direction, which appears to be parallel to the loading direction in the T-L specimen. The crack growth rate decreased significantly with decreasing dissolved oxygen concentration.
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