摘要
采用Ti-Zr-Fe-Cu-Ni-Co-Mo钎料实现了TiAl合金与GH536合金的有效钎焊连接.运用SEM,EDS,XRD等手段对钎焊接头的界面组织进行了分析,并检测了钎焊接头的抗剪强度.结果表明,钎焊接头的典型界面组织由TiAl合金一侧到GH536合金一侧包括Ⅰ层(Ti3Al+TiAl)、Ⅱ层(Al3NiTi2)、Ⅲ层(以AlNi2Ti为主,并含有富铬(Cr,Ni,Fe)SS、富镍(Cr,Ni,Fe)SS和(Ni)SS+TiNi3)和Ⅳ层(以富铬(Cr,Ni,Fe)SS为主,并含有富镍(Cr,Ni,Fe)SS,AlNi2Ti和(Ni)SS+TiNi3).当钎焊时间为10 min时,在1110~1170℃的钎焊温度范围内,随着钎焊温度的升高,钎焊接头的抗剪强度先升高后降低.钎焊温度对原子扩散和金属间化合物的形成有较大的影响,较低或较高的温度都会导致接头强度偏低.1150℃钎焊10 min获得的接头抗剪强度最高,为183 MPa,接头主要断裂在Ⅱ层.
Vacuum brazing of TiAl alloy and GH536 alloy with Ti-Zr-Fe-Cu-Ni-Co-Mo filler as interlayer was investigated.The microstructure of the brazed joints was characterized by employing SEM,EDS and XRD,and shear strength of the joints was analyzed in detail.Results show that the typical microstructure of the joint is given below:TiAl/layer I/layer II/layer III/layer IV/GH536.Layer I is mainly composed of Ti3Al,in which some TiAl phases are embedded.Layer II is constituted by Al3NiTi2.Layer III mainly contains AlNi2Ti,the other phases are Cr-rich(Cr,Ni,Fe)SS,Ni-rich(Cr,Ni,Fe)SS and(Ni)SS+TiNi3.In Layer IV,there are still Cr-rich(Cr,Ni,Fe)SS,but a small number of Nirich(Cr,Ni,Fe)SS,AlNi2Ti and(Ni)SS+TiNi3 can be observed.The shear strength first increases and then decreases in the brazing temperature range of 1110~1170°C for 10 min.The diffusion of atoms and the formation of intermetallic compounds are closely related to the brazing temperature.Lower or higher brazing temperature will lead to lower joint strength.It obtains a maximum value of 183 MPa at temperature of 1150°C with a holding time of 10 min,and the joints are mainly fractured at layer II.
作者
李小强
娄立
屈盛官
杨超
李力
LI Xiaoqiang;LOU Li;QU Shengguan;YANG Chao;LI Li(National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;East China Jiaotong University,Nanchang 330013,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2019年第10期80-85,I0004,I0005,共8页
Transactions of The China Welding Institution
基金
GF基础科研计划资助项目(No.JCKY2016603C003)
江西省教育厅科学技术研究资助项目(GJJ170372)
华南理工大学国家金属材料近净成形工程技术研究中心开放基金资助项目(2016005)
关键词
钛铝合金
镍基合金
钎焊
界面组织
抗剪强度
TiAl alloy
Ni-based alloy
brazing
interfacial microstructure
shear strength
