填加V/Cu复合中间层的TiAl基合金与钢激光焊接头组织和性能研究  

Microstructures and properties of laser-welded joints of TiAl-based alloy and steel with V/Cu composite interlayer

作　　者：李洪梅[1] 白雪 韩琦 何禹志 仲昭辉 LI Hongmei;BAI Xue;HAN Qi;HE Yuzhi;ZHONG Zhaohui(School of Materials Science and Engineering,Jilin University,Changchun 130025,China;College of Automotive Engineering,Jilin University,Changchun 130025,China)

机构地区：[1]吉林大学材料科学与工程学院,吉林长春130025 [2]吉林大学汽车工程学院,吉林长春130025

出　　处：《长春工业大学学报》2019年第5期434-440,共7页Journal of Changchun University of Technology

基　　金：国家自然科学基金资助项目(51805205);吉林省教育厅“十三五”科学技术研究规划基金资助项目(JJKH20180126KJ);吉林省科技厅基金资助项目(20180312034ZG)

摘　　要：采用激光焊方法连接TiAl基合金与40Cr钢。结果表明,填加V/Cu复合中间层可实现二者的优质连接,接头无裂纹缺陷,焊缝区形成Cu基固溶体相、(Fe,V,Cu)固溶体相及少量富Cu金属间化合物相,显著改善了接头脆性。接头抗拉强度为297 MPa,达到TiAl母材强度的75%以上。接头断裂于TiAl合金侧界面区,主要与界面区形成AlCuTi、AlCu 2Ti脆性金属间化合物有关。Laser welding is used to connect TiAl alloy with steel.The study indicates that adding V/Cu composite interlayer can realize the high-quality connection between the two dissimilar metals,and no crack is shown in the joint.Cu base solid solution phase,(Fe,V,Cu)solid solution phase and a small amount of Cu-rich intermetallic compound phase are formed in the weld zone,which greatly improves the brittleness of the joint.The tensile strength of the joint is 297 MPa,which is more than 75%of the strength of TiAl base metal.The joint fracture is found in the TiAl/weld interface,which is mainly related to the formation of brittle intermetallic compounds of AlCuTi and AlCu 2Ti.

关 键 词：TIAL基合金 40Cr 激光焊 V/Cu复合中间层 组织与性能 

分 类 号：TG456.7[金属学及工艺—焊接]