面向大型金属工件组织模拟与预测的元胞自动机-有限元模型(英文)

A coupled cellular automaton-finite element model andits application in the microstructure simulation oflarge-scale metallic workpiece

基于能量最低原理,本文建立了适用于金属材料塑性变形过程中动态再结晶组织模拟的元胞自动机模型。模拟结果表明:晶界和第二相粒子对位错运动的阻碍作用有利于动态再结晶形核;变形组织中晶粒尺寸符合Weibull分布,平均晶粒边数随着变形量的增加逐渐增大至理想值6。将有限元方法和元胞自动机模型的耦合,本文模拟了金属材料的多道次热轧过程,分析了轧板中再结晶晶粒尺寸及分布、再结晶分数及分布。与实验结果的对比分析表明。

A modified cellular automaton method based on the lowest energy principle has been applied to simulate the microstructure evolution and dynamic recrystallization （DRX） behavior during the hot deformation. The simulated resuhs show that the impediment of the grain boundaries and second phase 6articles to the dislocation movement contributes to the nucleation of dynamic recrystallization. For the DRX microstructure, the distribution of grain size follows Weibull function and the average number of grain sides increases gradually to an ideal value of 6 with the increasing strain. The coupled cellular automaton -finite element model can be successfully used to investigate the complicated multi - pass deformation process. The morphology and topology including the distributions of grain Size and the number of grain side were＂ investigated and their dependency on the deformation conditions was also discussed in the present paper. The comparisons between the simulated and experimental results show that the present CA - FEM model can be used as another effective method to simulate and predict the plastic deformation of large - scale metallic workpiece,