铝合金搅拌摩擦搭接焊温度-再结晶-析出相-力学性能一体化数值模拟  

Integrated Numerical Simulation of Temperature-recrystallization-precipitate-mechanical Property in Friction Stir Lap Welding of Aluminum Alloy

作　　者：张昭[1,2] 谭治军 李健宇 苑红磊 刘伟嵬[3] ZHANG Zhao;TAN Zhijun;LI Jianyu;YUAN Honglei;LIU Weiwei(Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024;School of Mechanical Engineering,Dalian University of Technology,Dalian 116024)

机构地区：[1]大连理工大学工程力学系,大连116024 [2]大连理工大学工业装备结构分析国家重点实验室,大连116024 [3]大连理工大学机械工程学院,大连116024

出　　处：《机械工程学报》2020年第6期213-220,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(11572074);辽宁省自然科学基金(2019-KF-05-07)资助项目。

摘　　要：采用移动热源模型计算铝合金搅拌摩擦搭接焊工艺过程的温度场,结合析出相演化模型计算焊接工艺过程中的析出相平均半径和体分比。通过析出相演化模型计算得到的析出相体分比与MonteCarlo模型结合,计算搅拌区内考虑析出相作用的再结晶行为,得到的晶粒形貌在有限元重构,用于晶体塑性力学计算模型,预测搅拌区内材料的力学性能,从而建立铝合金搅拌摩擦搭接焊温度-再结晶-析出相-力学性能的一体化计算模型,对所模拟的三种搭接焊工况进行同样工艺条件下的试验,通过试验和数值模型的对比验证了所提出的一体化计算模型的有效性。Moving heat source model is used to calculate the temperature distributions in friction stir lap welding. Precipitate evolution model is then combined to calculate the mean radius and volume fraction of the precipitates. The precipitate volume fraction, obtained from the precipitate evolution model, is combined with Monte Carlo model to simulate the recrystallization with consideration of the precipitate contributions. The obtained grain morphologies are re-built in finite element models, which are used for the crystal plasticity model. The mechanical behavior in the stirring zone is then predicted. The integrated model of temperaturerecrystallization-precipitate-mechanical property is then completely established. Three cases of friction stir lap welding, whose parameters are identically the same with the numerical models, are performed in experiments. The comparison of experimental and numerical data can validate the proposed integrated model.

关 键 词：搅拌摩擦焊 搭接焊 Monte Carlo模型 析出相计算 力学性能 

分 类 号：TG451[金属学及工艺—焊接]