2012 Fiscal Year Final Research Report
Effect of geometrical distribution of sub-grain boundaries on creep properties of Ni-based superalloys
| Project/Area Number |
24656411
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kobe University |
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Principal Investigator |
TANAKA Katsushi 神戸大学, 大学院・工学研究科, 教授 (30236575)
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| Project Period (FY) |
2012
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| Keywords | 超合金 / クリープ変形 / デンドライト境界 / 幾何的必要転位 / 引張圧縮非対称性 |
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| Research Abstract |
Geometrically required dislocations are distributed at sub-grain boundaries that corresponds to interfaces of dendrites grown in Ni-based superalloys. In the present study, we have performed compressive creep tests to observe the development of creep dislocation networks at gamma/gamma-prime interfaces, and of parallel raft structure. When a compressive stress is applied along tothe growth direction, the magnitude of primary creep is very small compared with that applied perpendicular to the growth direction. We have constructed a creep testing machine that can use a very small specimen without dislocation networks in it.
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