Abstract:Improving the hot working performance of difficult-to-deform alloys, such as powder metallurgy superalloys, is an important way to improve their formability, yield rate and the development of high performance alloys. Hot extrusion can effectively improve the microstructure of the alloy and enhance its hot working properties during the preparation process. This paper reviews the research progress on hot extrusion process parameters of powder metallurgy superalloys in recent years, systematically discusses the influence of hot extrusion parameters on the extrusion process and microstructure, and summarizes the research work on the selection and optimization of hot extrusion parameters. At present, the influence of extrusion speed and extrusion ratio on alloy microstructure, numerical simulation of hot extrusion process and optimization of extrusion device need to be further studied. This paper is used to provide reference for understanding the hot extrusion process and subsequent engineering practice, and to provide certain theoretical guidance and technical support for regulating the alloy microstructure, optimizing the hot working process and improving the hot working performance.