深冷处理对YG8硬质合金/42CrMo钢钎焊接头残余应力的影响

Effect of cryogenic treatment on residual stress of YG8 cemented carbide/42CrMo steel brazed joints

通过ANSYS仿真软件建立了YG8硬质合金/42CrMo钢钎焊接头的焊接工艺模型和深冷处理工艺模型,分析了接头表面残余应力分布,并与经深冷+回火处理后的焊接接头表面残余应力进行对比。结果表明,深冷处理可使焊接接头42CrMo钢侧形成残余压应力,且深冷温度对残余压应力的影响较深冷次数更明显。最优深冷工艺为-160℃深冷3次,且仿真结果与试验测量值相差不大,表明所建立的模型具有一定的可靠性。

Welding process model and cryogenic treatment process model of YG8 cemented carbide/42CrMo steel brazed joint were established through ANSYS simulation software,and the residual stress distribution on the joint surface was analyzed and compared with the brazed joint after cryogenic and tempering treatments.The results show that cryogenic treatment can cause the formation of residual compressive stress on the 42CrMo steel side of the brazed joint,and the influence of cryogenic temperature on the residual compressive stress is more obvious than the number of cryogenic treatments.The optimal cryogenic process is treating at-160℃for three times,and the simulation result is not much different from the experimental one,indicating that the established models have a certain degree of reliability.