文献类型：期刊文献

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

作者：Ma, Han-Yang[1];Duan, Peng-yang[1];Liao, Peng-peng[1];Zhou, Guo-Yan[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2022

卷号：31

期号：2

起止页码：1631

外文期刊名：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录：;EI(收录号：20214211026339);WOS:【SCI-EXPANDED(收录号:WOS:000706940300002)】；

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

语种：英文

外文关键词：brazing temperature; brazed joints; microstructure evolution; metallurgical reactions; 316L stainless steel

摘要：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 degrees C 991 degrees C, 1033 degrees C, 1065 degrees C, 1100 degrees C, 1137 degrees C and 1170 degrees 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 gamma-Ni in the ASZ gradually coarsen below 1033 degrees C. When the temperature reaches 1065 degrees 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 degrees 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.