6005A-T6/6082-T6铝合金FSW与MIG接头组织与性能研究  

Microstructure and properties of 6005A-T6/6082-T6 aluminum alloy welded MIG and FSW joints

作　　者：肖静[1] 宫文彪[1] 刘威[1] 刘杰[2] 

机构地区：[1]长春工业大学材料科学与工程学院,吉林长春130012 [2]长春轨道客车股份有限公司,吉林长春130062

出　　处：《长春工业大学学报》2015年第1期1-5,共5页Journal of Changchun University of Technology

基　　金：吉林省科技厅科技攻关项目(20100362);长春市科技攻关重大项目(13KG19)

摘　　要：采用光学显微镜、拉伸试验机、显微硬度计和疲劳试验机对FSW及MIG焊接接头的微观组织及力学性能进行了研究。结果表明:FSW焊核区为细小的等轴晶,热机械影响区呈现为被拉长的畸变晶粒,热影响区的组织明显粗化;MIG接头焊缝区晶粒为明显的铸态组织,热影响区晶粒长大情况也比FSW严重。与MIG相比,搅拌摩擦焊焊接(FSW)接头的抗拉强度相对较高,最小硬度值出现在后进侧的热影响区;高周疲劳(Nf>107)时,FSW的接头疲劳强度高于MIG接头疲劳强度,高出约14%。Microstructure and mechanical properties of MIG and Friction stir welded 6005A-T6 and 6082-T6 aluminum alloy were investigated by optical microscope, tensile tester, Vickers hardness tester and fatigue and fatigue tester. The result show that the nugget zone（NZ） has a fine equiaxed grain structure, the grain in the thermo-mechanical affected zone（THAZ） have been elongated, The grains are obviously grew up in the heat affected zone（HAZ）. The weld metal zone of MIG is casting microstructure, and the growth of the HAZ is serious than that of FSW. Compared to MIG, the tensile strength of the joints welded by FSW is relatively higher and the lowest hardness appeared in the HAZ of retreating side, the fatigue strength of the FSW joints is about 14% higher than that of MIG.

关 键 词：铝合金 搅拌摩擦焊 组织 力学性能 

分 类 号：TG115.28[金属学及工艺—物理冶金]