Residual stress exists in an equilibrium state inside an object without external forces,mainly due to uneven plastic deformation during object preparation.Superalloys exhibit low stacking fault energy and face difficulty in recovery.Therefore,compared with the residual stress in other metal materi-als,the residual stress in superalloys accumulates easily and is difficult to release and control,causing various problems in their subsequent processing and service.Starting from the formation and evolution mechanism of residual stress in superalloy forgings,this article reviews the research progress regarding the casting,forging,heat treatment,machining,and welding processes involved in residual stress charac-terization,numerical simulation,optimization control,etc.and focuses on analyzing the interaction behav-iors between multiscale residual stress and precipitation phase transformation in superalloys.Further,this article analyzes the impact of residual stress on the service performance of superalloy forgings;the possi-bility of reasonable preset and utilization of residual stress is envisioned based on this.
关键词
高温合金/残余应力/形成机理/数值模拟/优化控制
Key words
superalloy/residual stress/formation mechanism/numerical simulation/optimization and control
维普
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