Effects of heat treatment on microstrucutures of a Re-containing Ni-based single crystal superalloy

摘要

Effects of heat treatment on microstrucutures of a Re-containing single crystal superalloy have been investigated.The results showed that(γ+γ')eutectic in as-cast alloy is practically dissolved with solution heat treatment,and the degree of segregation is distinctly decreased.The size,morphology and distribution of γ’phase are mightily affected by the first-stage ageing treatment temperature.When the first-stage ageing treatment temperature lower than 1160°C,the shape of the γ’phase is cubic.But the γ’phase shape is transformed to sphericity when the temperature higher than 1180°C.The y phase channel width is significantly increased,and the fine y’phase precipitated in the y phase matrix channel.