Wang Yubo, Liu Wei, Cui Heng, Lu Guipeng
Key Laboratory of Advanced Structural Materials, Ministry of Education and School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, People's Republic of China.
CCRC Changchun Railway Vehicles Co., Ltd, Changchun, 130062, People's Republic of China.
Sci Rep. 2024 Mar 21;14(1):6824. doi: 10.1038/s41598-024-57316-3.
Over the last 20 years, industry interest in copper has increased. Its application in the petrochemical, automotive, and nuclear power industries highlights the need for new research directions especially in the joining of copper to other metals. In this work, lap joint of 304 stainless steel and T2 copper precoated with Cu-Mn-Ni filler metal was performed by laser brazing. The aim of this study is to characterize the influence of laser beam incidence angle on the welded joint forming mode, microstructure, elements diffusion and corrosion resistance. According to the findings, the joint is classified as a welded joint when the laser beam incidence angle is 80°, and as a welded-brazed joint when it's 90°, 70°, or 60°. The microstructure is mainly composed of Cu-rich and Fe-rich phases, Mn in the Cu-rich phase aggregation and Cr in the Fe-rich phase aggregation. In the fusion zone (FZ) the content of less than 50% of the liquid will be in the form of supersaturated droplets in the matrix of the other side. The local corrosion pair that the copper steel matrix and liquid drop produce in the FZ speeds up the dissolution of the Cu-rich phase, which effected corrosion resistance of the joint.
在过去20年里，行业对铜的兴趣有所增加。其在石化、汽车和核电行业的应用凸显了新研究方向的必要性，特别是在铜与其他金属的连接方面。在这项工作中，通过激光钎焊对预涂有铜-锰-镍填充金属的304不锈钢和T2铜进行了搭接接头焊接。本研究的目的是表征激光束入射角对焊接接头形成模式、微观结构、元素扩散和耐腐蚀性的影响。根据研究结果，当激光束入射角为80°时，接头被归类为焊接接头；当入射角为90°、70°或60°时，则归类为熔钎焊接头。微观结构主要由富铜相和富铁相组成，锰在富铜相聚集，铬在富铁相聚集。在熔合区（FZ），含量少于50%的液体将以过饱和液滴的形式存在于另一侧的基体中。铜钢基体和液滴在熔合区产生的局部腐蚀对加速了富铜相的溶解，从而影响接头的耐腐蚀性。
