摘要
通过热模拟实验与金相实验建立7050铝合金流变应力模型与动态再结晶的元胞自动机模型(CA模型),该模型综合考虑动态回复、位错密度以及形核率等因素对动态再结晶的影响。应用DEFORM-3D有限元软件模拟7050铝合金自由锻过程与微观组织演变,研究工艺参数与锻件变形程度对微观组织的影响。研究结果表明:变形充分的中心区域先发生动态再结晶,拔长工艺对动态再结晶影响明显,经过拔长可得到均匀细化的组织;经过自由锻工艺后动态再结晶体积分数为40%左右,平均晶粒尺寸为20μm左右。模拟结果与工业实验结果吻合。
The cellular automaton（CA） model of dynamic recrystallization（DRX） for 7050 aluminium alloy was established by thermal-mechanical simulation test and the metallurgical experiment,in which the effects of dynamic recovery,dislocation density and nucleation rate on the DRX were considered.The process of free forging and the law of microstructure evolution for 7050 aluminium alloy were investigated on the software platform of DEFORM-3D.The simulated results show that the DRX occurs sufficiently at the center area of the forging with sufficient deformations.The stretching progress has a great influence on DRX,which can refine the grains and improve the microstructure.By means of multiple-stretching process,the refined and uniform DRX grains can be obtained.Through the free forging the recrystallization volume fraction changes to 40% and the average grain size changes to 20 μm.The simulation results agree well with the industrial results.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期1814-1820,共7页
Journal of Central South University:Science and Technology
基金
国家重点基础研究发展计划("973"计划)项目(2005CB724105)
关键词
7050铝合金
动态再结晶
微观组织
元胞自动机
7050 aluminium alloy
dynamic recrystallization
microstructure
cellular automaton
