钢/铝异种金属激光深熔钎焊接头特性  

Characteristics of Fe/Al Dissimilar Joint by Laser Penetration Welding-Brazing

作　　者：蔡鹏飞 陈强[2] 陈树海[2] CAI Pengfei;CHEN Qiang;CHEN Shuhai(Aerospace Changping Technology Co.,Ltd,Beijing 100083,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]航天长屏科技有限公司,北京100192 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《沈阳大学学报（自然科学版）》2020年第1期1-6,共6页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(51475040).

摘　　要：采用激光深熔钎焊的方法系统研究了Q235钢板/5052铝合金板的接头特性.研究发现,钢/铝异种金属激光熔钎焊接头界面处生成了平均厚度在5~10μm的金属间化合物层,其中靠近钢侧的部分为较为平整的Fe 2Al 5,靠近铝侧的部分为针状或舌状的Fe 4Al 13,化合物层的厚度随界面热输入的提高而增加.接头的抗拉强度随着界面处的热输入量呈先增加后减小的趋势,断裂位置为金属间化合物层内部或其与母材的结合面处,脆性断裂特征明显,最高抗拉强度为55.2 MPa.The characteristics of Q235 steel/5052 aluminum alloy joint by laser penetration welding-brazing were investigated.It was found that there were intermetallic compounds layer with average thickness of 5~10μm along the interface of the Fe/Al laser penetration welding-brazing joint.There were Fe2Al5 near to steel side and Fe4Al13 adjacent to aluminum alloy,respectively.The thickness of the layers increased with increasing welding heat input.The tensile strength of the joint increased first and then decreased with increasing the heat input.The joint fractured inside intermetallic compounds layers or the interface of the layer and parent metal.The fracture surface exhibited typical brittle characteristics.The highest tensile strength of the joints was 55.2 MPa.

关 键 词：钢/铝异种金属 激光深熔钎焊 金属间化合物层 脆性断裂 抗拉强度 

分 类 号：TG442[金属学及工艺—焊接]