铜/钛异种金属焊接微观组织及力学性能研究  

Microstructure and Mechanical Properties of Cu/Ti Dissimilar Metal Welding

作　　者：潘明财 周杰 郭顺[1] 兰司 PAN Mingcai;ZHOU Jie;GUO Shun;LAN Si(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《铜业工程》2023年第2期1-7,共7页Copper Engineering

基　　金：国家自然科学基金项目(52105367);江苏省自然科学基金杰出青年基金项目(BK20200019)资助。

摘　　要：研究采用电子束偏置铜侧的方法完成了T2铜和TC4的异种金属焊接,并采用光学显微镜(OM)、扫描电镜(SEM)、显微硬度及抗拉强度测试等方式分析其微观组织及力学性能特征。研究结果表明:铜侧焊接具有成形较好的焊缝,焊缝表面鱼鳞纹较均匀,成形较好,无明显的微裂纹、气孔以及夹渣现象,电子束焊接可实现单侧焊接双面成形。钛合金侧焊缝可观察到宽度25~40μm的金属间化合物层,金属间化合物层由多种反应产物组成,金属间化合物层的存在将恶化接头的力学性能。在偏铜侧1.5 mm焊接时,抗拉强度可达到152 MPa,相当于T2 Cu抗拉强度的66%,拉伸断口表现为脆性解理断裂,引起断裂的主要物相为CuTi相。The dissimilar metal welding of T2 copper and TC4 was completed using an electron beam with an offset on the copper side.The microstructure and mechanical properties were analyzed by optical microscopy,scanning electron microscopy,microhardness,and tensile strength tests.The results showed that welding on the copper side possesses good weld formation.Moreover,the weld surface had a uniform fish scale,good formation,and no apparent microcracks,pores,as well as slag inclusions,demonstrating that electron beam welding could achieve single-sided welding and double-sided forming.Furthermore,an intermetallic compounds layer with a width of 25~40μm could be observed in the weld of the titanium alloy side.The intermetallic compounds layer was composed of a variety of reaction products.It had been revealed that the intermetallic compounds layer would deteriorate the mechanical properties of the joint.This studies further confirmed that when welding on the copper side with a 1.5 mm offset,the tensile strength could reach 152 MPa,equivalent to 66%of the tensile strength of T2 copper.Besides,the tensile fracture showed brittle dissociation fracture,and the main possible phase causing fracture was CuTi phase.

关 键 词：钛合金 铜合金 电子束焊接 微观组织 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]