Ｉｎｃｏｎｅｌ７１８の機械的特性に及ぼす熱処理の影響
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概要
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The effect of γ″ (Ni3Nb) particle size on the mechanical properties and deformation mechanism of Inconel 718 was investigated. In this study, two kinds of aging heat treatment were used to obtain different γ″ particle size. The effect of γ″ size on the tensile/compressive-proof, creep and fatigue strengths at 24°C and 650°C were studied. When the average size of γ″ particle was 18 nm, they were considered to be sheared by the group of 1/2<110> dislocations during tensile deformation. When the average size of γ″ particle was 42 nm, the tensile deformation was occurred by the passage of deformation twins at 650°C. The creep and fatigue strengths were considered to be decreased as the deformation mechanism changed from dislocation's shearing of γ″ particle to deformation twins. The tension/compression anisotropy in single crystal Ni-base superalloys has been reported when the deformation twin is observed. However, in the polycrystalline Inconel 718, in spite of existence of the deformation twin, the anisotropy in yield strengths was not observed.
- The Japan Institute of Metals and Materialsの論文
The Japan Institute of Metals and Materials | 論文
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