| Project/Area Number |
26420036
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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 | National Institute for Materials Science |
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Principal Investigator |
TABUCHI MASAAKI 国立研究開発法人物質・材料研究機構, 構造材料研究拠点, グループリーダー (60354239)
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| Co-Investigator(Kenkyū-buntansha) |
本郷 宏通 国立研究開発法人物質・材料研究機構, 構造材料研究拠点, 嘱託職員 (40354237)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 耐熱材料 / USCプラント / クリープ / 溶接継手 / 損傷評価 / 破壊力学 / 損傷力学 / 高効率火力発電 / 材料力学 / 高温材料 / A-USCプラント |
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| Outline of Final Research Achievements |
In order to decrease CO2 emission, researches to increase temperature and pressure of steam by using high strengthened material in the thermal power plant. In the present research, long-term creep rupture data from 30000h to 70000h of high Cr steel welds used in USC plant were obtained. It was clarified that creep damages initiate not only in HAZ but also in weld metal. It was found that the hardness of the weld metal decreased rapidly after about 10000 h creep at 600C due to the recovery of microstructures. Small number density of precipitates promote the recovery of the weld metal. Computational system to predict fracture life of welded component was developed and improved. A method that can predict experimental results well was proposed. Creep and crack growth tests were also conducted for advanced steel and weld that are used next generation A-USC power plant. Mechanisms and properties of strength and fracture of advanced high-B 9Cr steel and dissimilar weld joint were clarified.
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