05Cr17Ni4Cu4Nb/HR-2异种钢激光焊接接头组织及力学性能研究  

Study on Microstructure and Mechanical Properties of Laser Welded Joint of 05Cr17Ni4Cu4Nb/HR-2 Dissimilar Steel

作　　者：刘航天 王群 雷华东[2] 赵健[1] Liu Hangtian;Wang Qun;Lei Huadong;Zhao Jian(School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Institute of Machinery Manufacturing Technology,China Academy of Engineering Physics,Mianyang 62190,Sichuan,China)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620 [2]中国工程物理研究院机械制造工艺研究所,四川绵阳621900

出　　处：《应用激光》2024年第10期102-110,共9页Applied Laser

基　　金：中国工程物理研究院发展项目(TCGH0607)。

摘　　要：对20 mm厚05Cr17Ni4Cu4Nb马氏体不锈钢与HR-2奥氏体不锈钢进行异种钢激光深熔焊接试验,借助光学显微镜、扫描电镜及能谱仪对接头微观组织及物相成分进行分析,并采用显微硬度计及拉伸试验机对焊接接头进行力学性能测试。结果表明,采用激光深熔焊可获得无缺陷且成形较好的焊接接头。基于舍夫勒相图推测焊缝区主要为奥氏体和少量铁素体组织,借助光学显微镜及扫描电镜验证了焊缝区组织主要为γ-Fe奥氏体及少量的蠕虫状δ-铁素体的结论。接头显微硬度测试结果表明焊缝区硬度略高于HR-2母材,显著低于05Cr17Ni4Cu4Nb母材。焊接接头拉伸测试时的拉伸试样断裂位置均发生在HR-2不锈钢母材一侧,表明接头抗拉强度高于HR-2不锈钢母材,且断裂方式为典型的韧性断裂。The laser deep penetration welding test of dissimilar steel was carried out on 20 mm thick 05Crl7Ni4Cu4Nb martensitic stainless steel and HR-2 austenitic stainless steel.The microstructure and phase composition of the joint were analyzed by optical microscope,scanning electron microscope and energy dispersive spectrometer,and the mechanical properties of the welded joint were tested by microhardness tester and tensile tester.The results show that laser deep penetration welding can produce defect-free joints with acceptable geometry.Based on Schaeffler phase diagram,it is speculated that the weld zone is mainly composed of austenite phase and a small amount of ferrite structure.With the help of optical microscope and scanning electron microscope,it is verified that the weld zone is mainly composed of γ-Fe austenite and a small amount of vermicular structure δ-Ferrite.Microhardness measurements revealed that the weld zone hardness is slightly higher than that of the HR-2 base metal but lower than that of the 05Cr17Ni4Cu4Nb base metal.Tensile testing demonstrated that the welded joint's fracture occurred at the HR-2 stainless steel base metal side,indicating that the joint's tensile strength exceeds that of the HR-2 base metal,with the fracture mode being characteristic of ductile failure.

关 键 词：激光焊接 异种不锈钢焊接 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]