高温合金闪光焊环件是能满足航空发动机制造的重要构件。由于对高温合金闪光焊接机理认识不清晰，焊接组织与性能关系规律研究缺乏，导致闪光焊接环件质量波动大，性能控制缺乏标准，限制了其应用范围。申请人根据闪光焊接是通过闪光加热+顶锻变形完成焊接的特点，结合对焊缝微观结构研究结果，得出焊接界面上的动态再结晶对焊缝形成具有重要影响。提出采用热变形模拟方法对闪光焊接过程进行模拟。采用带界面试样，研究温度、压缩变形速率和变形量对界面上发生动态再结晶的影响规律，获得焊缝形成条件。根据模拟实验所得条件开展GH4169闪光焊接实验，研究闪光焊接温度场形成规律，顶锻变形参数变化对焊缝组织的影响规律，认清焊缝与热影响区组织性能关系。获得满足质量要求的闪光焊接边界条件，由此建立一种闪光焊接加工图，描述GH4169合金完成闪光焊接所需温度及顶锻变形条件范围。研究成果将对闪光焊应用于航空环件提供新的思路和技术支撑。

Flash butt welded superalloy rings are important components to meet the manufacturing of the aeroengines. Due to the mechanism of flash butt welding are poorly understood, and lack of research results on relationship between the microstructure and properties of weldment. The quality of flash butt welded component varies widely, and has no mechanical property standards. And the applied scope of flash butt welded parts was limited. The study about flash butt welding finds that flash butt welding is heated by flash process and completed welding by upset deformation. And the dynamic recrystallization on the interface has an important influence on the formation of welding seam according to the microstructure of welding seam. Thermal deformation simulation method is used to simulate the welding process in this work. The specimens with interface are used, and the effect of temperature, compression degree and rate on the dynamic recrystallization on the interface will be researched. Forming conditions of welding seam will be studied. Then the flash butt welding test of GH4169 is performed according to the conditions of simulation experiments. The establishing of flash butt welding temperature field will be studied. The weldment characteristics under different deformation conditions, and the relationship between microstructure and mechanical properties of their heat affected zone will be researched. According to the boundary conditions of flash butt welding, which can fulfill quality requirement of weldment. The flash butt welding processing map will be established, which can describe the temperature and the upset deformation condition of flash butt welded GH4169 alloy. The results of this research will meet the technical requirements for the manufacture of flash butt welded rings for aviation, and provide reference for the application development of flash butt welding technology.