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Effect of Temperature on Metallurgical Reactions and Microstructure Evolution of 316L/BNi-2 Brazed Joints

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Abstract

Compact components are prone to failure at brazed joints. A comprehensive understanding of the effect of brazing temperature on the metallurgical reactions and microstructure evolution of 316L/BNi-2 brazed joints will provide support for optimization of the brazing process and improving joints strength. In this paper, the brazing process was carried out at 966°C 991°C, 1033°C, 1065°C, 1100°C, 1137°C and 1170°C in a vaccum furnace. The morphology and crystal structure of different zones of the brazed joints including athermal solidification zone (ASZ), isothermal solidification zone, and diffusion-affected zone (DAZ) were investigated. Results show that the DAZ begins to form, and the Ni3B, Ni3Si, CrB, and γ-Ni in the ASZ gradually coarsen below 1033°C. When the temperature reaches 1065°C, the filler alloy completely liquidizes. The boron in the filler alloy diffuses into the base metal, resulting in isothermal solidification. The residual liquid phase generates binary and ternary eutectic reactions. According to TEM patterns analysis in the DAZ, borides, and carbon-boride are mainly distributed on grain boundaries and within grains, respectively. In addition, M5B3 boride in the DAZ gradually transforms into M2B boride due to its better thermodynamic stability. Above 1170°C, the borides in the DAZ partly dissolve, and meanwhile, the matrix transforms from martensite to austenite, forming the alternating distribution of austenite and boride. During the heating process, with increasing brazing temperature, the hardness and elastic modulus of brazed joint microregions gradually decrease.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (Grant No 51675181).

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  1. Key Laboratory of Pressure Systems and Safety (MOE), East China University of Science and Technology, Shanghai, 200237, China

    Han-Yang Ma, Peng-yang Duan, Peng-peng Liao, Guo-Yan Zhou & Shan-Tung Tu

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Ma, HY., Duan, Py., Liao, Pp. et al. Effect of Temperature on Metallurgical Reactions and Microstructure Evolution of 316L/BNi-2 Brazed Joints. J. of Materi Eng and Perform 31, 1631–1641 (2022). https://doi.org/10.1007/s11665-021-06296-w

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  • DOI: https://doi.org/10.1007/s11665-021-06296-w

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