水溅冷却对铝合金搅拌摩擦焊接头组织、织构及力学性能的影响  

Effect of Water Splat Cooling on Microstructure,Texture and Mechanical Properties of Friction Stir Welded Aluminum Alloy Joints

作　　者：罗章 孙有平[1,2,3] 何江美 吴光庆[1] 刘鑫雨 LUO Zhang;SUN Youping;HE Jiangmei;WU Guangqing;LIU Xinyu(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Liuzhou 545006,Guangxi,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Liuzhou 545006,Guangxi,China)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545006 [2]广西土方机械协同创新中心,广西柳州545006 [3]广西汽车零部件与整车技术重点实验室,广西柳州545006

出　　处：《矿冶工程》2024年第5期153-158,共6页Mining and Metallurgical Engineering

基　　金：广西重点研发计划(桂科AB23026104)。

摘　　要：采用光学显微镜、扫描电镜以及拉伸试验机等手段研究了水溅冷却辅助搅拌摩擦焊(WCaFSW)对铝合金焊接接头组织、织构和力学性能的影响。结果表明:与正常的搅拌摩擦焊(FSW)相比,WCaFSW能够显著降低焊核区的晶粒尺寸,促进焊核区各区域晶粒尺寸的均匀性,提高大角度晶界占比;FSW接头焊核区织构类型为■和B剪切织构,而WCaFSW接头焊核区织构类型为■和C剪切织构。WCaFSW接头抗拉强度高于FSW接头,但延伸率低于FSW接头。WCaFSW和FSW接头的断裂形式均为韧性断裂。The effect of water splat cooling assisted friction stir welding(WCaFSW)on the structure,texture and mechanical properties of aluminum alloy welding joints were investigated by means of optical microscopy,scanning electron microscopy and a tensile testing machine.The results show that compared to normal friction stir welding(FSW),WCaFSW can lead to grains in weld nugget zone(WNZ)with significantly reduced size and grains in all regions of WNZ with more uniform size,and a higher percentage of high-angle grain boundaries.The WNZ of FSW joints have A and B shear texture,while the WNZ of WCaFSW joints have B/B and C shear texture.Compared to FSW joints,WCaFSW joints have higher tensile strength and lower elongation rate.And ductile fracture is the main failure mode in both WCaFSW and FSW joints.

关 键 词：水溅冷却 搅拌摩擦焊 接头组织 铝合金 织构 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]