Research progresses in effect of heat treatment on microstructure and properties of GH2132 alloy

GH2132 alloy， as one of the representative materials of high-temperature alloys based on Fe-25Ni-15Cr，has become a widely used high-temperature material below 650 ℃ due to its excellent comprehensive properties. At present，the research on GH2132 alloy mainly focuses on three aspects： solid solution heat treatment，solid solution + aging heat treatment，and direct aging heat treatment. This article summarizes recent research on the alloy in these three aspects and analyzes the impact of heat treatment processes on microstructure and properties. During the solid solution treatment process of GH2132 alloy，attention should be paid to the effect of the dissolution of Laves and M3B2 phases on grain size to prevent grain coarsening. The alloy after solid solution exhibits the characteristics of low strength and high plasticity. The formulation of aging treatment process needs to be combined with solid solution treatment process，taking into account the influence of coupling effect and preventing occurrence γ′ → η transform and reduce the reinforcement effect. The microstructure of GH2132 alloy is sensitive to deformation，and the larger the deformation，the lower the aging temperature or shorter the aging time should be chosen.