Microstructure evolution of TC4 titanium alloy/316L stainless steel dissimilar joint vacuum-brazed with Ti-Zr-Cu amorphous filler metal

被引：0
作者：
Yueqing Xia
Honggang Dong
Xiaohu Hao
Shuai Li
Peng Li
Guoshun Yang
机构：
[1] Dalian University of Technology,School of Materials Science and Engineering
[2] Shanghai Aerospace Equipment Manufacturer,undefined
来源：
Welding in the World | 2019年 / 63卷
关键词：
Vacuum brazing; Ti-Zr-Cu amorphous filler metal; Interfacial microstructure; Intermetallic compound (IMC); Shear strength;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
TC4 titanium alloy was vacuum-brazed to 316L stainless steel (SS) with Ti-Zr-Cu amorphous filler metal. The effect of brazing time and temperature on the interfacial microstructure and mechanical properties of joints was investigated. Electron probe micro-analyzer (EPMA) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) were used to study the joint microstructure; meanwhile, the reaction phases on fracture surfaces were identified by X-ray diffraction (XRD). The results show that all joints had similar interfacial microstructure of TC4 titanium substrate/Widmanstätten/β-Ti + Ti2Cu/(α-Ti + λ-Cu2TiZr) + Ti2Cu/Ti-Fe-Cu/TiFe/(Fe, Cr)2Ti/σ-phase + Fess/316L stainless steel substrate. Three reaction layers TiFe/(Fe, Cr)2Ti/σ-phase + Fess formed close to 316L stainless steel substrate and could benefit the mechanical properties of joints. The maximum shear strength of 65 MPa was obtained at 950 °C for 10 min. During shear test, cracks initiated at the interface of Ti-Cu-Fe layer/TiFe layer and propagated along the brazed seam/316L interface with a large amount of cleavage facets existing on the fracture surface.
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页码：323 / 336
页数：13
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