| Project/Area Number |
15360369
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | KYOTO UNIVERSITY (2005-2006)
Kagawa University (2003-2004) |
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Principal Investigator |
TANAKA Katsushi Kyoto Univ., Mater.Sci.& Eng., Associate Professor, 工学研究科, 助教授 (30236575)
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| Co-Investigator(Kenkyū-buntansha) |
UEJI Rintaro Kagawa Univ., Adv.Mater.Sci., Assistant Professor, 工学部, 助手 (80380145)
KISHIDA Kyosuke Kyoto Univ., Mater.Sci.& Eng., Assistant Professor, 工学研究科, 助手 (20354178)
角田 直人 香川大学, 工学部, 教授 (20029200)
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| Project Period (FY) |
2003 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥13,500,000 (Direct Cost: ¥13,500,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2003: ¥8,100,000 (Direct Cost: ¥8,100,000)
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| Keywords | superalloy / creep deformation / raft structure / phase stability / elastic constants / elastic strain energy / 弾性緩和 / 非破壊検査 / ラフト組織 / 異方的弾性歪 |
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| Research Abstract |
Development of elastic strain in nickel base super alloy during creep deformation has been investigated. The results show that the change in elastic strain is owing to stack creep dislocations at gamma gamma-prime interfaces. Theoretical calculations about the stability of microstructure indicate that the raft structure is stabilized by a small amount of creep dislocations, however, the raft structure is destabilized by a large amount of creep dislocations. The critical amount of creep dislocations agrees with that for perfectly accommodate the lattice misfit between gamma and gamma-prime phases. In the destabilized raft structure, the most stable lamellar plane normal is not the [001] direction but that tilted toward the <111> direction. This is the reason why the raft structure collapses during the creep deformation. The measurement of elastic strain is useful to detect an early stage of creep deformation, however, the measurement is less sensitive to the change occurred in a later stage of its lifetime.
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