摘要
采用金相显微镜、扫描电镜、显微硬度计、拉伸试验仪等手段研究了镁合金ZK60-Gd搅拌摩擦焊接头的组织与性能.结果表明:ZK60-Gd镁合金的焊接参数为:焊接速度120～240mm/min,搅拌头转速900～1300r/min.热输入量过大或不足均可导致缺陷;焊接头各区域的组织均有明显特征,焊核区形成细小均匀的再结晶组织;通过焊接工艺优化,焊缝的抗拉强度可达285MPa,为母材强度的87.08%,试样断裂均发生在热影响区.
The microstructure and properties of the friction stir welding（FSW） joint of ZK60-Gd alloy were investigated by optical microscope（OM）, scanning electron microscopy（SEM）, microhardness and tensile test. The results show that the appropriate welding parameters are welding speed and rotation speed of stir head, which are n= 120--240 mrn/min and r= 900--1300 r/rain, respectively. Too high or too low heat input may cause defects. Each region of welding joint has obvious features in microstructure, and the nug- get region has recrystallization microstructure which is small and uniform. Through the optimization of welding technology, the tensile strength of welding joint can be up to 285 MPa, which is 87.08% of the parent metal. The fracture occurred in the heat affected zone（HAZ）.
出处
《材料研究与应用》
CAS
2012年第4期240-245,共6页
Materials Research and Application
基金
广东省产学研结合项目(2010A090200078)
