镍铝青铜过渡层对钛合金/不锈钢异种材料激光焊接头组织与力学性能的影响  

Effect of nickel aluminum bronze transition layer on microstructure and mechanical properties of laser welded titanium alloy/stainless steel joint

作　　者：牛小男 崔丽[1] 王鹏[1] 贺定勇[1] 曹庆 NIU Xiaonan;CUI Li;WANG Peng;HE Dingyong;CAO Qing(Beijing University of Technology,Beijing,100124,China;Jiangsu Spray Technology Co.,Ltd.,Yixing,214200,China)

机构地区：[1]北京工业大学,北京100124 [2]江苏斯普瑞科技有限公司,宜兴214200

出　　处：《焊接学报》2022年第1期42-47,I0005,I0006,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51621003)。

摘　　要：对3 mm厚TC4钛合金/15-5PH不锈钢异种材料进行了添加镍铝青铜(nickel aluminum bronze,NAB)过渡层的激光填充材料焊接,研究了NAB过渡层对接头成形、微观组织与力学性能的影响.结果表明,添加NAB过渡层的TC4钛合金/15-5PH不锈钢异种材料激光焊接获得了良好成形的全熔透接头,接头抗拉强度达290 MPa,接头钛合金侧界面层硬度为547.8 HV.接头钛合金侧界面由3种不同形态的金属间化合物层组成,其中脆性较小的Cu-Ti,Ni-Ti相的数量显著增多,而脆性高的Ti-Fe相数量明显减少,表明添加NAB过渡层抑制了接头钛合金侧界面脆性高的Ti-Fe相的形成.The laser welding of 3 mm thick TC4 titanium alloy/15-5 PH stainless steel was carried out with nickel aluminum bronze(NAB) as the transition layer. Effects of adding NAB transition layer on the joint formation, microstructure and mechanical properties were studied. The results show that the laser welding of TC4 titanium alloy/15-5 PH stainless steel with NAB transition layer can obtain a well-formed full penetration joint. The tensile strength of the joint is 290 MPa, and the hardness of the interface layer on the titanium alloy side is547.8 HV. The interface on the titanium alloy side of the joint is composed of three IMCs layers with different morphologies.The number of less brittle Cu-Ti and Ni-Ti phases increases significantly, while the number of highly brittle Ti-Fe phases decreases significantly, indicating that the addition of NAB transition layer inhibits the formation of highly brittle Ti-Fe phases at the interface of titanium alloy side.

关 键 词：激光焊 钛合金 不锈钢 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]