保温时间对部分瞬间液相连接硬质合金/钢接头组织与性能的影响  

Effect of Dwelling Time on Microstructure and Property of Cemented Carbide/Steel Joint Fabricated by Partial Transient Liquid Phase Bonding

作　　者：郭亚杰[1] 郭栋 周婷婷[1] 耿刚强[1] GUO Yajie;GUO Dong;ZHOU Tingting;GENG Gangqiang(Department of Materials Science and Engineering,Chang＇an University,Xitan 710064,China)

机构地区：[1]长安大学材料科学与工程学院,西安710064

出　　处：《机械工程材料》2018年第8期7-10,32,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金青年基金资助项目(51401034);陕西省重点研发计划项目(2017GY-033);中央高校基本科研业务费专项资金资助项目(310831172001)

摘　　要：以"三明治"结构的钛箔/镍箔/钛箔为中间层材料,采用部分瞬间液相(PTLP)连接方法在1 000℃保温不同时间(1~4h)制备了YG10硬质合金/40Cr钢异质金属接头,研究了保温时间对接头微观形貌、物相组成和剪切强度的影响。结果表明:接头为由YG10硬质合金/TiC+WC/Co-NiTi/Ni3Ti/镍层/Ni3Ti/NiTi/TiC/40Cr钢组成的多层结构,硬质合金和镍层以及钢和镍层之间均形成了宽35~50μm的过渡层;当保温时间从1h延长到4h时,接头过渡层中的微观缩孔数量减少,过渡层厚度增加,接头剪切强度先增大后减小;当保温时间为2h时,接头剪切强度最高,为153MPa。The sandwich structural titanium foil/nickel foil/titanium foil were used as interlayer materials,and then the dissimilar metal joint of YG10 cemented carbide and 40 Cr steel was prepared by partial transient liquid phase（PTLP）bonding at 1 000 ℃for different dwelling times（1-4 h）.The effects of dwelling time on the micromorphology,phase composition and shear strength of the joint were investigated.The results show that the joint had a multilayer structure composed of YG10 cemented carbide/TiC ＋ WC/Co-Ni-Ti/Ni3Ti/nikle layer/Ni3Ti/NiTi/TiC/40 Cr steel,and a transition layer with width of 30-50μm was formed between cemented carbide and nickle layer,and between steel and nickle layer,respectively.When the dwelling time increased from 1 hto 4 h,the amount of microcavities in the transition layer of the joint decreased,the thickness of the transition layer increased,and the shear strength of the joint increased first and then decreased.After dwelling for 2 h,the shear strength of the joint reached the largest value of 153 MPa.

关 键 词：硬质合金 瞬间液相连接 剪切强度 连接界面 

分 类 号：TG456.9[金属学及工艺—焊接]