稀土对GH4169激光微焊接接头组织性能的影响  

Effect of Rare Earth Elements on Microstructure and Properties of GH4169 Superalloy Joint Welded by Micro-Laser Welding

作　　者：陈玉华[1] 谢吉林[1] 黄永德[1] 越祖朕[1] 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室

出　　处：《航空制造技术》2015年第11期80-82,共3页Aeronautical Manufacturing Technology

基　　金：江西省科技支撑计划项目(20133BBE50021);江西省高校科技落地计划项目(KJLD14055);南昌航空大学卧龙之星培养计划项目(201302)资助

摘　　要：通过添加稀土元素Ce对0.2mm厚的GH4169高温合金进行微激光对接焊接,利用光学显微镜、扫描电镜、电子精密拉伸仪测试等分析方法,对比研究稀土元素对焊缝表面成形、接头显微组织及力学性能的影响。结果表明:在添加稀土元素的条件下焊接时,对焊接工艺参数进行正交试验优化,得出焊接最优工艺参数为脉冲功率17%、脉冲频率4.0Hz、脉冲宽度3.1ms,此时焊接接头断裂在母材。焊接过程中,液态金属流动使稀土在熔池中均匀混合,获得了组织均匀的焊缝。稀土元素能够改变焊缝温度梯度,形成"梯形"状焊缝;同时,稀土元素能够降低接头的显微硬度,增强接头的韧性和塑性。GH4169 superalloys with 0.2mm thickness are jointed by micro-laser welding with adding rare earth elements, and the influences of rare earth ele-ments on weld formation, the microstructure and mechani-cal properties of joints are studied by making use of optical microscopy, micro hardness tester, electronic precision stretching machine, and other analysis and detection meth-ods. The results show that the optimized processing param-eters with rare earth elements added is that the percentage of pulse power is 17%, pulse width is 3.1ms, and pulse frequency is 4.0Hz, at this moment the fracture of welded joint is at the base metal. During the welding process, the melted rare earth is fully uniformly mixed with the melted pool, and distributed weld zone structure is formed. Rare earth elements can change the temperature gradient of the weld zone, which induced to form trapezoidal shape weld zone. At the same time, welding joints with low hardness and good ductility and toughness welds are obtained attrib-uted to the rare earth elements.

关 键 词：稀土 GH4169高温合金 激光微焊接显微组织 性能 

分 类 号：TG456.7[金属学及工艺—焊接] TG407