| Project/Area Number |
20760443
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
SAWADA Kota National Institute for Materials Science, 材料信頼性センター, 主任研究員 (00354225)
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| Project Period (FY) |
2008 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
|
| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 高Cr耐熱鋼 / 溶接部 / クリープ / 金属組織変化 / 多軸応力場 / 高Crフェライト系耐熱鋼 / 溶接継手 / クリープ強度 / 多軸応力 / TypeIV破壊 / 微細組織変化 / Type IV破壊 |
|---|
| Research Abstract |
In welded joint of high Cr ferritic steel that is a structural material for thermal power plant with highest efficiency, the high temperature strength degrades during long-term service, leading to a fracture of pipe. In this study, stress multiaxiality effect on microstructural changes was investigated in the welded joint. It is clarified that the stress multiaxiality promotes precipitates coarsening at a high temperature, indicating acceleration of fracture.
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