钛合金TC6与TC11高频感应钎焊工艺

摘要

以B-Ti57CuZrNi-S为钎料,在氩气保护气氛下对TC6/TC 11钛合金进行高频感应钎焊工艺实验研究.采用光学显微镜(OM)、扫描电镜(SEM)及能谱分析(EDS)等测试方法,分析气体保护流量、流态以及工艺参数对焊接界面形貌、接头组织及元素分布的影响,并测试接头的抗拉强度.结果表明,钎焊界面主要由富Ti的β-Ti固溶组织和Cu-Ti、Ni-Ti以及(Cu,Ni)Ti/Zr组成的金属间化合物相组成.钎焊接头的抗拉强度随钎焊温度的升高或保温时间的延长,呈现先升高后降低的趋势,接头最高强度可达433 MPa.TC6/TC 11钛合金高频感应钎焊优化工艺参数带为:焊接温度910℃～930 ℃,保温时间120～150s,Ar气保护流量l MPa.%High frequency induction brazing of TC6/TC11 titanium alloy under argon atmosphere with B-Ti57CuZrNi-S as the brazing alloy has been studied.The impact of flow rate and flow pattern of atmosphere,brazing temperature,holding time on microstructures,element distribution and mechanical properties of joints has been researched by optical microscopy (OM),scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).The results show that brazed interface was constituted by two-phase structure,which were rich Ti solid solution and intermetallic compound of Cu-Ti,Ni-Ti,(Cu,Ni)Ti/Zr.With the increase of brazing temperature or holding time,brazed joint strength first increased and then decreased,the highest strength was 433 MPa.The optimized process parameters for high frequency induction brazing of TC6/TC11 titanium alloy were flow rate of Argon 1 MPa,brazing temperature 910 ℃～930 ℃,holding time 120～150 s.