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Interfacial Microstructure and Mechanical Properties of TC4 Titanium Alloy/316L Stainless Steel Joint Brazed with Ag70.5Cu27.5Ti2 Filler Metal

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Abstract

Vacuum brazing of TC4 titanium alloy and 316L stainless steel was conducted using Ag70.5Cu27.5Ti2 filler metal, the effects of microstructure and mechanical properties of brazing temperature on interface were investigated, and the bonding mechanism of brazed joint was also established. The results show that the filler metal and the base metal on both sides were completely diffused and bonded well. The microstructure of brazed joint interface is as follows: TC4 titanium alloy/diffusion layer(α-Ti + Ti2Cu)/reaction layer (including TiCu and Ti2Cu)/joint center area/TiFe layer/316L stainless steel. When the holding time lasted for 15 min, the shear strength of brazed joint first increased and then decreased as the brazing temperature rose. When the brazing temperature upped to 870 °C, the maximum of shear strength reached 190 MPa, and then the fracture occurred in the center of the brazed joint. The hardness of the joints gradually increased as the temperature rose, and the mean value reached maximum of 323 HV at 930 °C.

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Acknowledgements

This study was funded by College Students’ Extracurricular Open Experiment Project (KSZ18512) and the fund of State Key Laboratory of Long-life High Temperature Materials (DTCC28EE200795).

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Authors and Affiliations

  1. School of New Energy and Materials, Southwest Petroleum University, Cheng’du, 610500, China

    Mei Yang, Xin Wu, Honglang Yang & Shuang Li

  2. State Key Laboratory of Long-Life High Temperature Materials, Dong Fang Turbine Co., Ltd., Deyang, 61800, Sichuan, China

    Xiufang Gong & Liping Nie

  3. Sichuan Petroleum Engineering Construction Co., Ltd., Cheng’du, 610000, China

    Yang Li

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  1. Mei Yang
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  2. Xin Wu
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  3. Xiufang Gong
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  6. Honglang Yang
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  7. Shuang Li
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Correspondence to Mei Yang or Liping Nie.

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Yang, M., Wu, X., Gong, X. et al. Interfacial Microstructure and Mechanical Properties of TC4 Titanium Alloy/316L Stainless Steel Joint Brazed with Ag70.5Cu27.5Ti2 Filler Metal. Trans Indian Inst Met 74, 1907–1916 (2021). https://doi.org/10.1007/s12666-021-02297-4

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  • DOI: https://doi.org/10.1007/s12666-021-02297-4

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