基于DEFORM-3D的纯铝快速冷却搅拌摩擦焊数值模拟和试验研究  

Numerical Simulation and Experimental Study on Rapid Cooling Friction Stir Welding of Pure Aluminum Based on DEFORM-3D

作　　者：刘露涛 顾帛坤 卢正达 许楠 宋亓宁 包晔峰[1] LIU Lutao;GU Bokun;LU Zhengda;XU Nan;SONG Qining;BAO Yefeng(College of Mechanical and Electronic Engineering,Hohai University,Changzhou 213022,China)

机构地区：[1]河海大学机电工程学院,江苏常州213022

出　　处：《热加工工艺》2024年第13期79-84,共6页Hot Working Technology

基　　金：江苏省自然科学基金资助项目(BK20211076);国家自然科学基金资助项目(51805145);大学生创新创业训练计划项目(202210294149Y)。

摘　　要：采用DEFORM-3D软件建立了A1050纯铝传统搅拌摩擦焊(FSW)和快速冷却FSW焊缝的有限元模型,分析了冷却介质对焊缝温度场和微观组织演变的影响规律,并采用电子背散射衍射技术对两种FSW试验的结果进行分析,以验证模拟结果。结果表明:在焊接过程中通过添加冷媒介质,快速冷却FSW的峰值温度较传统FSW明显降低,在搅拌头后方快速冷却FSW的温度梯度明显大于传统FSW。快速冷却FSW焊缝的晶粒尺寸减小、小角度晶界比例增加且位错密度更高。模拟结果与试验结果基本吻合。The finite element model of conventional friction stir welding(FSW)and rapid cooling FSW of A1050 pure aluminum was established based on DEFORM-3D software,and the effect of the cooling medium on the temperature field and microstructure evolution of the weld was analyzed.The results of the two FSW tests were analyzed to verify the simulation results by using electron backscatter diffraction technique.The results show that the peak temperature of rapid cooling FSW is significantly lower than that of conventional FSW due to addition of cooling medium.The temperature gradient of rapid cooling FSW behind the tool is obviously bigger than that of conventional FSW.Compared with conventional FSW,the rapid cooling FSW weld has finer grains,and the ratio of low-angle grain boundary increases and the dislocation density is bigger.The simulation results are consistent with the experimental results.

关 键 词：纯铝 搅拌摩擦焊 温度场 微观组织 

分 类 号：TG457.14[金属学及工艺—焊接] TG453.9