Cellular automaton modeling of peritectic transformation.

A two-dimensional multiphase cellular automaton (CA) model is proposed for the prediction of growth kinetics and microstructural evolution during peritectic transformation of Fe-C alloys. The proposed model is validated by comparing the simulation results with the experimental measurements and analytical predictions for the growth kinetics of the [Formula: see text] -phase and the concentration distributions. The simulated time evolution of the [Formula: see text] -phase thickness and the concentration distribution in the [Formula: see text] -phase agree well with the experimental data, demonstrating the quantitative capabilities of the proposed model. The influences of the holding temperature and [Formula: see text] -phase thickness on the [Formula: see text] -phase growth behavior are analyzed based on the simulation results. The [Formula: see text] -phase growth velocity is found to decrease with increasing the [Formula: see text] -phase thickness and holding temperature. Simulations are also performed for the microstructural evolution during isothermal peritectic transformation of Fe-C alloys with the primary [Formula: see text] -phase being an equiaxed dendrite under different holding temperatures. It is found that the driving force for [Formula: see text] -phase growth increases with decreasing temperature.