A Model for Prediction of Phase Transformation during Quenching of Steel

The key consideration in heat treatment model is phase transformation kinetics under non-isothermal cooling. In this study, a program is developed to predict austenite transformation by kinetics model under non-isothermal conditions. For doing so, the classical additivity rule and Avrami-type rate equation is evaluated to handle the phase kinetics under non-isothermal conditions. And comparing with continuous cooling experimental results, the validation of the rate equation was confirmed firstly. Also, to simultaneously consider the effect austenite decomposition on temperature and stress variations, heat conduction equation coupling phase transformation is solved using a two-dimensional finite element approach. To establish the reliability of theoretical results, a comparison is made between simulated and experimental cooling curves and microstructure.