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.
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 whichis utilized by the automaton in a probabilistic fashion. The competition betweennucleation and growth of ferrite is described by the changes of a nucleationprobability and a growth probability in this cellular automaton lattice. The procedureof this cellular automaton modelling is generalized, and the effect of coolingconditions on this transformation is also discussed.
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