三叉晶界优先形核模型及其动态再结晶仿真

为了实现三叉晶界处动态再结晶优先形核,基于元胞自动机的摩尔邻居,提出一个辨识三叉晶界处元胞的方法和三叉晶界优先形核模型,通过HPS485wf钢动态再结晶过程的元胞自动机仿真检验了该模型的合理性和应用效果.研究结果表明,所提方法和优先形核模型可有效用于动态再结晶过程仿真;与传统模型相比,其仿真结果不仅保持了由传统模型仿真得到的动态再结晶的多轮次演变过程、组织形貌特征、"S型"的动态再结晶面积分数-应变曲线和全程流变应力模拟精度(0.1%),而且能够在所辨识三叉晶界处实现优先形核,更真实地反映了动态再结晶的形核现象.

Preferential Nucleation Model at Triple Junction and Its Dynamic Recrystallization Simulation

In order to perform preferential nucleation at triple junction during dynamic recrystallization (DRX)， a method of identifying the cell existed at triple junction and a preferential nucleation model at triple junction were proposed on the basis of the Moore neighbor of cellular automata. The rationality and application of the model were proved by simulating the DRX process of HPS485wf steel. The results showed that the proposed method and model have the ability to simulate the DRX more effectively. Compared with those from the traditional models， the results from the present model don’t only maintain the evolution of multiple rounds， microstructural feature， the “S-type” curve between area fraction and strain， the simulated flow stress with an accuracy of 0.1% in the process of DRX， and also reveal the preferential nucleation at triple junction， which would provide a more realistic DRX nucleation.