基于磁控冶金的铝/钢异种金属焊接特性  

Welding characteristics of Al/steel dissimilar metals based on magnetically controlled metallurgy

作　　者：闫飞 周一凡 唐本刊 胥永刚[2] 王春明[3] YAN Fei;ZHOU Yifan;TANG Benkan;XU Yonggang;WANG Chunming(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan,430070,China;Key Laboratory of Advanced Technologies of Materials,Ministry of Education China,Southwest Jiaotong University,Chengdu,610031,China;Huazhong University of Science and Technology Wuhan,430074,China)

机构地区：[1]武汉理工大学,现代汽车零部件技术湖北省重点实验室,武汉430070 [2]西南交通大学,材料先进技术教育部重点实验室,成都610031 [3]华中科技大学,武汉430074

出　　处：《焊接学报》2022年第5期98-103,I0009,I0010,共8页Transactions of The China Welding Institution

基　　金：2020年度材料先进技术教育部重点实验室(西南交通大学)开放基金(KLATM202002);国家级大学生创新创业训练计划(S202110497179).

摘　　要：预置纵向交变磁场对铝/钢异种材料进行激光搭接深熔焊试验,采用金相显微镜、扫描电镜等分析方法研究交变磁场对接头宏观形貌、显微组织、元素分布、力学性能及其断裂方式的影响.结果表明,外加交变磁场作用下铝/钢接头焊缝的熔宽减小、熔深增加.交变磁场诱导焊缝熔池中产生的电磁力促使界面层形成的IMCs由连续分布转向离散分布,成分偏析和裂纹缺陷得到抑制.界面层IMCs可能由ζ-FeAl_(2),θ-FeAl_(3)和β_(2)-FeAl组成.与未加磁场相比,外加磁场辅助激光焊接可以提高接头的载荷能力,这主要归功于结合面积的增加与焊缝IMCs组织的细化.Laser lap deep penetration welding was conducted on Al/steel dissimilar metals with longitudinal alternating magnetic field.Effects of alternating magnetic field on the macromorphology,microstructure,element distribution,mechanical properties and fracture mode of the joints were carefully investigated using metallographic microscope,scanning electron microscope and other methodologies.The results showed that the weld width decreased and the weld depth increased under applied alternating magnetic field.The electromagnetic force induced by an alternating magnetic field promoted the transformation of resultant IMCs at interface from continuous distribution to discrete distribution.During this process,composition segregation and crack defects were also successfully suppressed.IMCs in interfacial layer may be composed ofζ-FeAl_(2),θ-FeAl_(3) andβ_(2)-FeAl.Laser welding with applied external magnetic field can improve the loading capacity of the joint.It can attribute to the increase of combined areas and refinement of IMCs structure.

关 键 词：交变磁场 激光焊接 界面化合物 力学性能 裂纹缺陷 

分 类 号：TG456.7[金属学及工艺—焊接]