Al/Ti异质合金回填式搅拌摩擦点焊数值模拟  

Numerical Simulation of Al/Ti Dissimilar Alloys Refill Friction Stir Spot Welding

作　　者：宋奎晶[1] 韦勇 徐萌 季雨凯 刘鑫泉 张铭雨 杨蓓 钟志宏[1] SONG Kuijing;WEI Yong;XU Meng;JI Yukai;LIU Xinquan;ZHANG Mingyu;YANG Bei;ZHONG Zhihong(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Aerospace Engineering Equipment(Suzhou)Co.,Ltd.,Suzhou 215200,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]航天工程装备(苏州)有限公司,江苏苏州215200

出　　处：《热加工工艺》2024年第11期42-48,共7页Hot Working Technology

基　　金：国家自然科学基金项目(51905143);中央高校基本科研业务费专项资金资助项目(JZ2018HGTA0209)。

摘　　要：采用耦合的欧拉-拉格朗日(CEL)算法对2 mm厚的5A02铝合金/TC4钛合金板异质金属回填式搅拌摩擦点焊过程展开模拟研究,分析了旋转速度和停留时间对焊点成型过程中温度场、等效塑性应变场以及材料流动的影响。结果表明,在扎入初期,热累积作用明显,升温速率相对较快,随焊接过程进行,产热会由摩擦产热转变为摩擦和塑性变形共同产热,升温速率放缓。当搅拌头转速为2000 r/min、扎入速度为1 mm/s、扎入深度为1.9 mm、回填速度为1mm/s、停留时间为0 s时,铝合金焊核区温度峰值达到558℃,等效塑性应变峰值达到120。在模拟的工艺区间内,焊核区峰值温度与旋转速度呈正相关,停留时间对温度的影响并不明显。Refill friction stir spot welding(RFSSW)of dissimilar alloys of 2 mm thick 5A02 aluminum alloy/TC4 titanium alloy plates was simulated by coupled Euler-Lagrange(CEL)algorithm.The effects of rotation speed and dwell time on the temperature field,equivalent plastic strain field and material flow during RFSSWwere analyzed.The results show that at the initial stage of welding,the heat accumulation is obvious and the heating rate is relatively fast.As the welding process continues,the heat generation form transfers form friction heat to friction and plastic deformation,and the heating rate slowed down.Under the stirring tool rotation speed of 2000 r/min,plunging rate of 1mm/s,plunging depth of 1.9 mm,retracting rate of 1mm/s,dwell time of 0 s,the peak temperature of nugget zone at the Al alloy side reaches 558℃and the maximum equivalent plastic strain is 120.In the simulated process range,the peak temperature of the nugget zone is proportional to the rotation speed of stirring tool.The effect of dwell time on the temperature is not obvious.

关 键 词：回填式搅拌摩擦点焊 耦合的欧拉-拉格朗日 异质合金 温度场 等效塑性应变 

分 类 号：TG453.9[金属学及工艺—焊接]