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Title:: Optimization of Coating Materials to Suppress Substrate Thermal Effects in Induction Brazing

Author(s):: ZHAO Mengqi; SHI Qiusheng; Chen Lin; YANG Guanjun; State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering,Xi‘a(chǎn)n Jiaotong University, Xi’an 710049, China

Keywords:: induction remelting; coating characteristics; finite element method; temperature distribution; numerical study

Abstract:: To suppress the substrate thermal effects in induction brazing, a two-dimensional finite element model was established to study the induction remelting process of the coating. The influence of the coating materials and thickness on the temperature field was investigated. Under the present conditions, the following conclusions were drawn: when the thickness of the Ti49Zr49Be coating was between 0. 1 and 0. 5 mm, the movement of the coating melting interface was significantly affected by the coating thickness.With an increase in coating thickness, both the sensitive depth of the substrate and the duration above the sensitive temperature decreased.Compared to the high-melting-point Ni71CrSi nickel-based coating, the lowmelting-point Ni65CrP nickel-based coating exhibited a shallower sensitive depth and shorter duration during the remelting process. Similarly,compared to the Ni65CrP nickel-based coating with the same melting point, the Ti49Zr49Be titaniumbased coating showed a shallower sensitive depth and shorter duration during the remelting process. Therefore, reducing the melting point of the coating material and appropriately increasing the coating thickness are both beneficial in reducing the sensitive depth and duration, thereby suppressing the substrate thermal effects in induction brazing.