Ti/Cu异种金属电子束焊接界面行为  

Interface behavior and mechanical properties of Ti/Cu dissimilar metals welding by electron beam

作　　者：郭顺[1] 罗添元 彭勇[1] 周琦[1] 朱军[3] GUO Shun;LUO Tianyuan;PENG Yong;ZHOU Qi;ZHU Jun(Nanjing University of Science and Technology,Nanjing 210094,China;CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130000,China;Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]南京理工大学,南京210094 [2]中车长春轨道客车股份有限公司,长春130000 [3]南京工程学院,南京211167

出　　处：《焊接学报》2019年第8期26-32,I0002,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51805265,51505226)

摘　　要：为了获得高强度T2铜和Ti-6Al-4V钛合金异种金属接头,采用电子束焊方法开展试验,并对接头界面组织及力学性能进行了分析.试验在钛/铜熔钎焊接基础上,通过在高熔点钛侧复合二次焊接,构建钛/铜结合界面金属间化合物层的重熔温度场,进而实现钛/铜金属间化合物层的重熔改性.通过有限元温度场模拟及SEM,XRD等检测.结果表明,钛侧重熔焊接可在结合界面处形成1 000℃左右高温,金属间化合物层发生局域重熔.在随后凝固过程中,由于散热方向及元素再分配,相的形成顺序发生改变,钛原子向铜侧的扩散距离减短,高硬度相Ti Cu向Ti2Cu转变,相结构优化,最终接头强度得以提升.In order to obtain high-strength dissimilar metals joints of T2 copper and Ti-6Al-4V titanium alloy,electron beam welding was used to carry out experiments,and the interfacial microstructure and mechanical properties of the joints were analyzed.Based on the Ti/Cu welding-brazing process,the remelting temperature field of intermetallic compounds layer at the Ti/Cu bonding interface was constructed by secondary composite welding on the Ti side of high melting point,and then the remelting modification of Ti/Cu intermetallic compounds layer was realized.By temperature field simulation of FEM and detection of SEM,XRD,the results shown that a high temperature of about 1 000°C at the interface was formed by remelting welding at titanium side,leading to local remelting of intermetallic compound layer.In the process of solidification,due to the direction of heat dissipation and the redistribution of elements,the formation sequence of the phase was changed,the diffusion distance of titanium atoms was reduced and TiCu with high hardness was transformed to Ti2Cu.The phase structure was optimized and finally the strength of the welded joints improved.

关 键 词：电子束焊接 钛合金 金属间化合物 微观组织 

分 类 号：TG456.3[金属学及工艺—焊接]