利用摩擦焊机对阶梯轴工件进行了连接,并采用淬火加三次回火的方式对接头进行了热处理。测试了接头的硬度、抗拉强度和微观组织,讨论了热处理对接头连接质量的影响。试验结果表明:热处理后,接头的硬度有大幅度提升;接头的抗拉强度也有较大改善;微观组织中残余奥氏体量进一步减少,组织稳定性增加。 Friction welding machine was used to connect the workpieces of stepped shaft, and the joint was heat-treated by quenching plus three times tempering. The hardness, tensile strength and microstructure of the joint were tested. The effect of heat treatment on the joint quality was discussed. The results show that after heat treatment, the joint hardness increases greatly; the tensile strength of the joint is also greatly improved; the amount of retained austenite in the microstructure is further reduced and the stability of the microstructure is increased.