以铌+铜为复合中间层扩散焊接钛合金/不锈钢接头的组织与性能  

Microstructure and Property of Diffusion Welded Titanium Alloy/Stainless Steel Joint with Nb and Cu as Composite Interlayer

作　　者：陈一帆 张占领[1,2] 邱然锋 CHEN Yifan;ZHANG Zhanling;QIU Ranfeng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Henan Province,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471023

出　　处：《机械工程材料》2018年第10期77-80,86,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金-河南省人才培养基金联合资助项目(U1204520);河南省高校创新人才支持计划项目(16HASTIT050);河南省国际科技合作计划项目(162102410023);河南省高等学校青年骨干教师资助计划项目(2013GGJS-064)

摘　　要：以铌片+铜片为复合中间层材料,在Gleeble-1500型热力模拟试验机上对TC4钛合金和15-5PH不锈钢进行真空扩散焊,测试了接头的抗拉强度,观察了接头界面区和拉伸断口形貌并进行了微区成分分析。结果表明:铌+铜复合中间层可以有效阻碍钛合金和不锈钢之间钛、铁、铬元素的相互扩散;不锈钢/铜、铜/铌、铌/钛合金这3个界面通过原子扩散形成良好的连接,在铜/铌界面处局部生成的少量细小的铌铁金属间化合物对接头抗拉强度的影响不大,最高抗拉强度达到540MPa;拉伸断裂时裂纹穿过铜层、铌层和金属间化合物扩展。With Nb sheet and Cu sheet as composite interlayer materials,the vacuum diffusion welding was carried out on TC4 titanium alloy and 15-5 PH stainless steel on a Gleeble-1500 thermomechanical simulator.The tensile strength of the joint was tested.The morphology at the interface and of the tensile fracture of the joint was observed,and the micro area composition was analyzed.The results show that the composite interlayer of Nb and Cu was helpful to restrain the interdiffusion of Ti,Fe and Cr,which came from titanium alloy and stainless steel.The strong bonding at stainless steel/Cu,Cu/Nb and Nb/titanium alloy interfaces was formed by atomic diffusion.A small amount of fine Nb-Fe intermetallic compound was formed at the Cu/Nb interface,which had little effect on the tensile strength of the joint.The maximum tensile strength reached 540 MPa.During tensile fracture the cracks propagated through the Cu layer,the Nb layer and the intermetallic compounds.

关 键 词：TC4钛合金 15-5PH不锈钢 真空扩散焊 复合中间层 

分 类 号：TG457.1[金属学及工艺—焊接]