单双道搅拌摩擦焊接5083/6082异种铝合金T型接头的组织与力学性能  

Microstructure and Mechanical Properties of Single-and Double-Pass Friction Stir Welded T-Joints of 5083/6082 Dissimilar Aluminum Alloys

作　　者：周法权 吉华 邓建峰 李文晓 郭伟强 徐红勇 洪晓祥 ZHOU Faquan;JI Hua;DENG Jianfeng;LI Wenxiao;GUO Weiqiang;XU Hongyong;HONG Xiaoxiang(Aerospace Engineering Equipment(Suzhou)Co.,Ltd.,Suzhou 215100,China;Light Alloys Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]航天工程装备(苏州)有限公司,苏州215100 [2]中南大学轻合金研究院,长沙410083

出　　处：《机械工程材料》2019年第10期35-40,共6页Materials For Mechanical Engineering

基　　金：国家重点研发计划项目（2016YFB0300901）;国家自然科学基金资助项目（51375503）

摘　　要：采用单道和反方向双道搅拌摩擦焊接5083-O(壁板)/6082-T6(筋板)异种铝合金T型接头,研究了其显微组织和力学性能。结果表明:单道焊接头的搭接界面由未焊接区、有效结合区和弱结合区组成,反方向双道焊后,弱结合区消除,有效结合区宽度增大;单、双道焊接头T方向拉伸时均在壁板母材处断裂,抗拉强度相近,L方向拉伸时分别在界面和筋板热影响区断裂,且双道焊接头的抗拉强度更高;单道焊接头前进侧弯曲时发生屈服,后退侧弯曲时发生脆断,双道焊接头前进侧和后退侧弯曲时均发生屈服;单、双道焊接头壁板方向的显微硬度保持在75HV左右,沿筋板方向的从热机影响区向母材区先降后增最后趋于稳定。T-joints of 5083-O(wall plate)/6082-T6(rib plate)dissimilar aluminum alloys were prepared by single-pass and reversed double-pass friction stir welding,and the microstructure and mechanical properties were studied.The results show that the lap interface of single-pass welded joints consisted of unconnected zone,effectively connected zone and kissing bond zone.After reversed double-pass welding,the kissing bond zone disappeared,and the effectively connected zone was broadened.The single-and double-pass welded joints both fractured in the base metal of the wall plate during T-direction tensile with the similar tensile strength,and fractured at the interface and in the heat affected zone of the rib plate,respectively,during L-direction tensile;moreover the double-pass welded joint had higher tensile strength.The single-pass welded joint yielded during the advancing side bending while brittlely fractured during the retreating side bending;the double-pass welded joint yielded during the advancing and retreating side bending.The microhardness of the single-and double-pass welded joints along the wall plate direction was kept at about 75 HV,and that along the rib plate direction decreased first,then increased and then was stabilized from the thermo-mechanical affected zone to the base metal.

关 键 词：异种材料 T型接头 双道搅拌摩擦焊接 力学性能 

分 类 号：TG453[金属学及工艺—焊接]