搅拌头结构对铝/钢搅拌摩擦焊接头组织及性能的影响  

Effect of tool structure on microstructure and properties of an aluminum/steel friction stir welding joint

作　　者：韩世伟 周长征 彭小洋 杜熙鹏 方皓 钟万亮 李小飞 许惠斌[3] HAN Shiwei;ZHOU Changzheng;PENG Xiaoyang;DU Xipeng;FANG Hao;ZHONG Wanliang;LI Xiaofei;XU Huibin(Chongqing Tiema Industries Group Co.,Ltd.,Chongqing 400050,China;The Sixth Army Representative Office in Chongqing,the Armaments Department of the Chinese People’s Liberation Army,Chongqing 400042,China;College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆铁马工业集团有限公司,重庆400050 [2]陆装驻重庆地区第六军代室,重庆400042 [3]重庆理工大学材料科学与工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2023年第4期151-156,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市自然科学基金项目(cstc2021jcyi-msxmX0391)。

摘　　要：为研究不同搅拌头结构对接头组织和力学性能的影响,对3 mm厚的6061铝合金与304不锈钢进行了搅拌摩擦焊对接试验。结果表明:随着搅拌头由圆柱搅拌头改进至圆锥+螺纹搅拌头,C型特征愈发明显;螺纹搅拌头促进了材料在水平方向和轴向的流动,得到的接头钢粒均匀且细小地分布在界面处;3种接头在焊缝区域的显微硬度变化规律相似,使用圆锥+螺纹的搅拌头时,焊缝区域的硬度更高;圆锥+螺纹搅拌头的接头平均抗拉强度为197.2 MPa,高于无螺纹搅拌头,断裂于铝侧热影响区处,断口表现为典型的韧性断裂模式。In order to study the effect of different tool structures on the microstructure and mechanical properties of a joint,this paper carries out friction stir welding butt tests on 3 mm 6061 aluminum alloy and 304 stainless steel.The results show that,with the optimization of the tool from a cylindrical one to a conical plus threaded one,the C-type characteristics are more and more obvious.The threaded tool promotes the flow of the material in horizontal and axial directions,and the steel particles of the joint are evenly and finely distributed at the interface.The changing law of microhardness of the three joints in the welding area is similar,and the hardness in the welding area is higher when the conical plus threaded tool is used.The average tensile strength of the joint of the conical plus threaded tool is 197.2 MPa,which is higher than that of the threadless tool.It breaks at the heat affected zone on the aluminum side,and the fracture shows a typical toughness fracture mode.

关 键 词：搅拌头 异种金属 搅拌摩擦焊 力学性能 断裂行为 

分 类 号：TG453[金属学及工艺—焊接]