(1. 洛阳工学院 材料工程系， 洛阳 471039;
2. 西安交通大学 机械工程学院， 西安 710049)
摘 要: 在对ZA12合金钨极氩弧焊接头HAZ不同部位(测点)焊接热循环曲线大量测试和计算基础上，借助于焊接热模拟技术，设计了进行焊接HAZ显微组织模拟的热循环参数，并在DM1000A型电阻加热式热模拟试验机上，实现了ZA12合金钨极氩弧焊焊接HAZ加热峰值温度 θm=370 ℃, 305 ℃区域(测点)显微组织的模拟。研究结果表明：ZA12合金钨极氩弧焊焊接HAZ组织热模拟试样的耐磨性均高于母材，并均随负荷的增加其耐磨性降低。焊接HAZ组织热模拟试样的耐磨性与其组织中α相内共析体组织形态密切相关。
关键字: ZA12合金； 钨极氩弧焊；焊接HAZ； 组织模拟； 摩擦学性能
（1. Department of Material Engineering， Luoyang Institute of Technology，Luoyang 471039, P.R.China;
2. Department of Mechanical Engineering， Xi′an Jiaotong University，Xi′an 710049, P.R.China）
Abstract:Base on a vast amount of testing and calculations for the welding thermal cycling curves of different testing points in HAZ(heat affected zone) of ZA12 alloy TIG welding joint， the thermalcycle parameters of microstructure stimulation of welding HAZ were designed ， and the microstructure simulation of testing points (θm is 370 ℃ and 305 ℃) of ZA12 alloy by TIG welding was carried out by the means of type DM1000A ohmicheating welding thermal simulation tester. The study results from the simulation specimen indicated that the wear resistance of welding HAZ of ZA12 alloy in comparison with that of base metal increases in varying degrees， and with loadincreasing the wear resistance decreases. The wear resistance of the simulation specimens of welding HAZ was closely related to theform of eutectoid microstructure in α phase.
Key words: ZA12； TIG welding； welding HAZ； microstructure simulation； tribological properties
