The microstructural evolution, mechanical and electrochemical properties of the rotary friction welding joint of 1MnCrMoNi maraging steel were investigated after post-weld heat treatment (PWHT). The joint could be divided into two zones: weld zone and thermo-mechanically affected zone. After PWHT, the parallel alignment of the laths turned ‘blurred’; sub-grain and cell structure appeared; M23C6 and $\epsilon$-Cu precipitated, respectively; the joint was softened. But the microhardness was still higher than that of base materials and distributed unevenly. The closer it was to the weld centre, the higher the microhardness was. No deformation occurred in the joints during tensile test, indicating the excellent bonding strength. PWHT process slightly reduced the impact toughness and corrosion resistance of the joint.

焊后热处理（PWHT）研究了1MnCrMoNi马氏体时效钢旋转摩擦焊接头的组织演变，力学性能和电化学性能。接头可分为两个区域：焊接区域和热机械影响区域。PWHT之后，板条的平行对齐变为“模糊”；出现亚晶粒和细胞结构；M23C6和$\epsilon$-Cu分别沉淀；关节变软了。但是显微硬度仍高于基材，并且分布不均。距焊接中心越近，显微硬度越高。在拉伸试验中，接头没有发生变形，表明了优异的粘结强度。PWHT工艺稍微降低了接头的冲击韧性和耐腐蚀性。