高钛6061铝合金轮毂精锻成形的微观组织模拟  

Numerical simulation of microstructure evolution for precision forging of high titanium 6061 aluminum alloy wheels

作　　者：陈微[1] 官英平[1] 王振华[1] 

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,河北秦皇岛066004

出　　处：《塑性工程学报》2017年第1期1-8,共8页Journal of Plasticity Engineering

摘　　要：为了研究铝合金轮毂在锻造过程中的组织变化,利用Gleeble-3500热模拟试验机对高钛6061铝合金在变形温度350~510℃,应变速率0.001~10 s^(-1)的条件下进行了热压缩模拟实验。通过对实验数据的回归分析,建立了高钛6061铝合金微观组织演变模型,结合热模拟试样金相数据对该模型进行了验证。利用二次开发的DEFORM有限元软件对某型号的锻铝轮毂成形过程的组织演变进行了模拟,并将模拟结果与实验结果进行了对比研究。研究结果表明:利用所建立的高钛6061铝合金微观组织演变模型的模拟结果与实验结果吻合较好,微观组织演变模型正确可靠。锻铝轮毂成形后轮辐侧表面的晶粒尺寸最小,心部次之,上表面晶粒最大,轮毂热锻时适当提高变形温度或降低变形速率都有利于提高轮毂轮辐各部位的再结晶体积百分数,同时,晶粒也能得到不同程度的细化。In order to study the change of the microstructure evolution of aluminum alloy wheel during the forging process,the hot compression tests of high titanium 6061 aluminum alloy were investigated by Gleeble-3500 thermo-mechanical system at 350-510 ℃ and0. 001-10 s-1. Hot deformation microstructure evolution model of high titanium 6061 aluminum alloy was established by analyzing the experimental data,and this model was verified by metallographic data of thermal simulation samples. The secondary development software DEFORM was used to simulate the microstructure evolution of one type of aluminum alloy wheel during the deformation process,and the simulation results were compared with the experimental results. The results show that the comparison between simulation results and experimental results shows a good agreement,the microstructure evolution model is accurate and reliable. When the deformation is complete,the grain size in spokes side surface is minimum,center is larger,and the out surface is the largest. Increasing deformation temperature or decreasing deformation rate is beneficial to improving the fraction of recrystallization about spoke,meanwhile,the grains can be refined.

关 键 词：高钛6061铝合金 轮毂 精锻 微观组织演变模型 数值模拟 

分 类 号：TG302[金属学及工艺—金属压力加工] TG146[一般工业技术—材料科学与工程]