银钎料焊缝凝固行为的数值模拟  

Numerical Simulation of Solidification Behavior of Silver Brazing Filler Metal Welding Seam

作　　者：王永彪 王嘉鑫 刘新田 张洋 钟素娟 刘建秀 王艳 WANG Yongbiao;WANG Jiaxin;LIU Xintian;ZHANG Yang;ZHONG Sujuan;LIU Jianxiu;WANG Yan(Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment,Zhengzhou University of Light Industry,Zhengzhou Henan 450002,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Henan 450000,China)

机构地区：[1]郑州轻工业大学河南省机械装备智能制造重点实验室,河南郑州450002 [2]新型钎焊材料与技术国家重点实验室,河南郑州450000

出　　处：《上海金属》2024年第1期70-74,共5页Shanghai Metals

基　　金：国家自然科学基金(51901208);河南省高等学校重点科研项目(20B430020);河南省科技攻关项目(202102210016,202102210272);郑州轻工业大学博士科研启动基金(2019BSJJ001)。

摘　　要：通过合金相图热力学与扩散动力学计算,并将结果引入相场模型,采用试验和模拟相结合的方法研究了BAg30CuZnSn钎料焊缝的凝固行为。结果发现:B元素的加入使得焊缝枝晶发生了明显的柱状晶向等轴晶转变(columnar to equiaxed transition, CET)的现象;随着钎焊后冷却速率的增加,焊缝凝固过程中枝晶形核数量增加,枝晶尖端半径减小;当B含量较低时,枝晶尖端半径较大,形核数量较少;随着B含量的增加,枝晶尖端半径逐渐减小,形核数量增加;但当B质量分数增加至4%时,枝晶形貌基本不再发生变化。Through the calculation of alloy phase diagram thermodynamics and diffusion dynamics and the calculated results being introduced into the phase-field model,the solidification behavior of BAg30CuZnSn brazing filler metals welding seam was studied by using a combination of experimental and simulation.The results showed that(a)with the addition of boron,the phenomenon of the columnar-to-equiaxed transition(CET)occurred in the dendrites of the weld;(b)with the increase in the cooling rate after brazing,the number of dendrite nucleation increased and the radius of dendrite tip decreased during the weld solidification;(c)when the content of boron was low,the radius of the dendrite tip was larger and the number of nucleation was smaller;(d)as the content of boron increased,the radius of the dendrite tip gradually decreased and the number of nucleation increased,but when the mass fraction of boron increased to 4%,the dendritic morphology remained basically unchanged.

关 键 词：热力学 BAg30CuZnSn钎料 凝固行为 相场法 

分 类 号：TG454[金属学及工艺—焊接]