合金钢氮化与氮化物沉淀动力学的元胞自动机模拟研究

Cellular Automaton Modeling of Nitridation and Nitride Precipitation in Alloy Steels

应用元胞自动机模型对合金钢表面氮化及扩散层中氮化物沉淀过程进行了计算机模拟。考察了过程的动力学和沉淀相尺寸与分布特征 ,以及氮势和稳定氮化物形成元素含量对它们的影响。结果表明氮化过程动力学为抛物线型 ,抛物线速率常数k随氮势提高呈线性增大 ;氮化物形成元素含量XM 对氮化速率也有影响 ,k～XM 基本呈线性正比关系 ;

Simulations of surface nitridation and nitride precipitation in alloy steels have beeb carried out with cellular automaton modeling.Process kinetics and size and distribtuion of precipitates,and their dependence on nitrogen potential and concentration of nitride-forming elements,are investigated.The results show a parabolic kinetics,with the parabolic rate constant linearly increasing with nitrogen potential and the concentration of stable-nitride-forming element of the alloy.The simulation further showed that the fraction and particle size of stable nitride precipitates in the surface layers increase with lowering of nitrogen potential.