Microstructure and mechanical properties of vacuum lap brazed joint of TC4 titanium alloy

doi:10.13251/j.issn.0254-6051.2024.10.014

Abstract

Abstract: TC4 titanium alloy plate was vacuum lap brazed with B-Ti57CuZrNi solder, and the effects of brazing temperature and time on microstructure and mechanical properties of the brazed joint were studied. The results show that the microstructure of brazed joint is mainly composed of solidification microstructure of B-Ti57CuZrNi solder and needle-like microstructure of diffusion transition layer. With the increase of brazing temperature, the width of weld and needle-like layer increases, and the width of solidification microstructure decreases. With the increase of brazing time, the width of solidification microstructure decreases, and the width of weld and needle-like layer increases. When the brazing temperature below 930 ℃, the room temperature tensile properties will decrease as the maximum breaking force at 910 ℃ is only 5.1-5.5 kN. When the brazing time is longer than 45 min, the room temperature tensile properties will also decrease. Considering the mechanical properties of the brazed joint, the brazing temperature of 930-950 ℃ and brazing time of less than 45 min are suitable.

Key words: B-Ti57CuZrNi solder, TC4 titanium alloy, vacuum lap brazing

CLC Number:

TG454

Zheng Chao, Hu Shengshuang, Wang Haojun, Zhao Hu, Zhang Yingyun, Ouyang Delai. Microstructure and mechanical properties of vacuum lap brazed joint of TC4 titanium alloy[J]. Heat Treatment of Metals, 2024, 49(10): 92-95.

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