6061-T4铝合金激光焊接接头组织与力学性能研究  

Microstructure and Mechanical Properties of Laser Welded Joint of 6061-T4 Aluminum Alloy

作　　者：王淼[1] 李天景[1] 曾一达 李明亮[1] 林兆擎 WANG Miao;LI Tianjing;ZENG Yida;LI Mingliang;LIN Zhaoqing(School of Automobile and Transportation,Yancheng Vocational and Technical Institute of Industry,Yancheng 224002,Jiangsu,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]盐城工业职业技术学院汽车与交通学院,江苏盐城224002 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《矿冶工程》2023年第1期141-144,149,共5页Mining and Metallurgical Engineering

基　　金：2021年江苏省高等学校自然科学研究面上项目(21KJD430003);2021年江苏省现代教育技术研究课题(2021-R-92586)。

摘　　要：对汽车用6061-T4铝合金板材进行激光焊接,采用金相显微镜、透射电镜、扫描电镜、维氏硬度测试、拉伸试验等研究了激光焊接接头微观组织、显微硬度、强度和塑性、拉伸试样断口形貌。结果表明,6061-T4铝合金激光焊接接头的母材区组织为粗大条状晶粒;焊缝中心组织为细小的铸态树枝晶,针状β″析出相在晶界偏聚,位错密度降低;激光焊接接头的强度(硬度)和塑性均比母材有一定下降。After 6061-T4 aluminum alloy sheet for automobile was welded by laser welding, the microstructure, microhardness, strength and plasticity of welded joint, as well as fracture surface morphology of tensile specimen were studied by using metallographic microscope, transmission electron microscope, scanning electron microscope, Vickers hardness test and tensile test. The results show that the laser welded joint of 6061-T4 aluminum alloy has a coarse strip of grain structure in its base metal area, the weld seam has a structure of very fine as-cast dendrite in the center, acicular β″ precipitates segregate at grain boundary, and dislocation density decreases. It is found that both the strength(hardness) and plasticity of laser welded joint are lower than those of base metal.

关 键 词：6061铝合金 激光焊接 焊接接头 微观组织 力学性能 焊缝 

分 类 号：TG407[金属学及工艺—焊接]