搅拌头转速对2024-T3铝合金搅拌摩擦焊接中晶粒生长的影响  

Effect of Rotation Speed of Stirring Head on Grain Growth in Friction Stir Welding of 2024-T3 Aluminum Alloy

作　　者：张昭[1,2] 胡超平 

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,大连116024 [2]大连理工大学国际计算力学研究中心,大连116024

出　　处：《机械工程材料》2018年第3期80-86,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(11572074;11232003);国家重点基础研究发展"973"计划项目(2011CB013401)

摘　　要：采用三维蒙特卡洛模型模拟2024-T3铝合金搅拌摩擦焊接时焊核区的晶粒生长过程,建立蒙特卡洛步数与焊接区域温度历程、时间历程的关系,对不同搅拌头转速下焊核区晶粒尺寸的变化进行模拟,并通过相同焊接条件下晶粒尺寸的试验值对其进行验证。结果表明:三维蒙特卡洛模型可以较好地反映不同搅拌头转速下焊核区的晶粒尺寸变化,平均晶粒尺寸的模拟预测值与试验值吻合良好;焊核区平均晶粒尺寸随搅拌头转速的增加而增大;在相同搅拌头转速下,搅拌头前进侧的平均晶粒尺寸略大于后退侧的,焊核区中缝处上表面的平均晶粒尺寸最大。Three-dimensional Monte Carlo model was applied to simulate the grain growth process of the stirring zone during friction stir welding of AA2024-T3 aluminum alloy.The relationship between the Monte Carlo steps and the temperature history and time history of the stirring zone was established.The variation of grain size in the stirring zone at different rotation speeds of stirring head was simulated and verified by the experimental values under the same welding conditions.The results show that the three-dimensional Monte Carlo model could reflect the changes of grain size in the stirring zone at different rotation speeds of stirring head well.The simulating predicted values of the average grain size were in good agreement with the experimental values.The average grain size in the stirring zone increased with the increase of the rotation speed of stirring head.The average grain size in the advancing side of the stirring head was slightly larger than that in the retreating side and the average grain size of the upper surface of the center seam in the stirring zone was the largest when the rotation speed of stirring head was the same.

关 键 词：搅拌摩擦焊 搅拌头 蒙特卡洛模拟 晶粒尺寸 

分 类 号：TG402[金属学及工艺—焊接]