| Project/Area Number |
24760589
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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 |
Structural/Functional materials
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| Research Institution | 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群) |
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Principal Investigator |
NOBUHIRO Miura 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工, システム工学群, 准教授 (60546167)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 単結晶Ni基超合金 / タービンブレード / γ’相 / ラフト構造 / 余命推定 / クリープ / 国際研究者交流 / 国際情報交換 |
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| Outline of Final Research Achievements |
The morphology of γ’ precipitates of a nickel-based superalloy serviced in a 1st HPT blade of a jet engine was investigated before and after aging to estimate the temperature and the stress distribution, and the stress directions in service. After serviced blade, rafted γ/γ’ structures formed as the parallel to (010) at the vicinity of coating layer of the pressure side. On the contrary, rafted plate which were parallel to (001) were observed at the trailing edge. However, most of the γ’ precipitates remained cuboidal in shape at the internal cooling channel side. After simple aging, the rafted γ/γ’ structures appeared in the direction parallel to the blade surface at all portions of the leading edge, while at the internal cooling channel side of the all portions, the γ’ precipitates were coarsened. Consequently, very complicated stress is load on the blade in service, and the stress direction and stress distribution are different by the part and portions.
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