【摘要】 采用低碳钢连续冷却过程中奥氏体→铁素体相变的元胞自动机模型,模拟了铁素体晶粒形核与生长的全过程,模型中考虑了溶质扩散在相变过程中的作用,在元胞自动机的网格内,晶粒的形核与生长用两个概率的变化来描述它们之间在相变过程中的相互竞争关系,给出了形核与生长的元胞自动机规则,总结了元胞自动机方法解决铁素体晶粒形核与生长问题的过程,并在该模型的基础上分析了冷却速率等因素对于晶粒形核与生长的影响。更多还原

【Abstract】 A two-dimensional cellular automaton model is developed to simulate the transformation from austenite to ferrite in low carbon steels during continuous cooling. The model, with a local rule-based scheme involving nucleation and growth of ferrite, incorporates the change of the solute field into a nucleation or growth function which is utilized by the automaton in a probabilistic fashion. The competition between nucleation and growth of ferrite is described by the changes of a nucleation probability and a growth probability in this cellular automaton lattice. The procedure of this cellular automaton modelling is generalized, and the effect of cooling conditions on this transformation is also discussed.更多还原