抄録
Creep rupture strength and morphology of γ' phase of. Inconel 713C. especially the effects of both long-term creep deformation and applied stress on γ-γ' microstructure, have been investigated mainly at 1000°C. The scatter band of creep rupture strength has increased with decrease in stress. Rafted γ' structure has not been formed during creep deformation at 47MPa, but formed under the stresses higher than about 100MPa. Morphology of γ' phase was assessed by both the distribution of γ' phase with respect to angle with stress axis and the aspect ratio of γ'-phase. It has been concluded that higher stresses are needed for polycrystalline Ni based superalloy to form a rafted γ' structure and the stress dependence of γ-γ' microstructure developed should be considered for a long-term service at elevated temperature.
