TC4/TNM钎焊接头界面组织及力学性能  

Interfacial Microstructure and Mechanical Property of TC4/TNM Brazed Joint

作　　者：李力 黄慧[1,2] 张文涛[1,2] 袁雷昕 罗芬 李小强 Li Li;Huang Hui;Zhang Wentao;Yuan Leixin;Luo Fen;Li Xiaoqiang(School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华东交通大学材料科学与工程学院,江西南昌330013 [2]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [3]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州510640

出　　处：《稀有金属材料与工程》2023年第12期4205-4211,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51865012);江西省自然科学基金(20202BABL204040);江西省教育厅科学技术研究项目(GJJ170372);国家金属材料近净成形工程技术研究中心开放基金(2016005);GF基础科研计划(JCKY2016603C003);民口配套规划研制项目(JPPT125GH038)。

摘　　要：采用Ti-25.65Zr-13.3Cu-12.35Ni-3Co-2Mo(质量分数,%)非晶箔带钎料在900~1020℃/10 min工艺下真空钎焊连接TC4和TNM合金,并系统研究了TC4/TNM钎焊接头的界面组织和形成机制以及钎焊温度对界面组织和剪切强度的影响规律。结果表明:钎焊温度900~980℃时接头的组织为TC4/细小网篮状(α+β)-Ti/γ-(Ti,Zr)2(Cu,Ni)+α-Ti/Ti_(3)Al/TNM,随钎焊温度的升高,钎缝中硬脆的γ相减少、韧性的α-Ti增加。钎焊温度为1000和1020℃时,接头的界面反应层由3层演变成2层且对应的物相分别是韧性差的粗针状(α+β)-Ti和Ti_(3)Al,粗针状(α+β)-Ti随温度的升高进一步粗化。钎焊接头抗剪切强度随温度的升高先增大后减小,钎焊温度980℃时抗剪切强度达到最大值494.83 MPa。剪切测试的钎焊接头均脆性断裂于TNM侧的钎缝中。Vacuum dissimilar brazing of TC4 alloy and TNM alloy was performed at 900-1020°C for 10 min using amorphous Ti-25.65Zr-13.3Cu-12.35Ni-3Co-2Mo(wt%)filler.The interfacial microstructure and formation mechanism of the TC4/TNM brazed joint were studied.The variation of the interfacial microstructure and shear strength of the brazed joints with brazing temperature were investigated.The results show that the interfacial microstructure of the TC4/TNM joints brazed at 900-980°C are TC4/fine basket weave(α+β)-Ti/γ-(Ti,Zr)2(Cu,Ni)+α-Ti/Ti_(3)Al/TNM.The amount of brittleγ-(Ti,Zr)2(Cu,Ni)decreases but that of the ductileα-Ti increases with the brazing temperature increasing.Once the brazing temperature increases to 1000°C and to 1020°C,the interfacial reaction layer of the TC4/TNM brazed joints transforms from three layers into two layers,which consist of coarse acicular(α+β)-Ti with poor ductility and Ti_(3)Al.And the coarse acicular(α+β)-Ti is further coarsened with the brazing temperature increasing.The shear strength of the TC4/TNM brazed joint increases first and then decreases with the increase in brazing temperature.The maximum shear strength of 494.83 MPa is obtained at 980°C.The brittle fracture primarily occurs in the brazing seam near TNM side regardless of brazing temperature during shear test.

关 键 词：真空钎焊 非晶钎料 钎焊温度 形成机制 

分 类 号：TG454[金属学及工艺—焊接]