Predictive model for austenite grain growth during reheating of alloy steels

An empirical model has been proposed to predict the grain growth of austenite for reheating alloy steels by considering the effect of various alloying elements. Additional elements such as Cu, Al, N were considered in the proposed model. The proposed model confirms that the austenite grain growth is suppressed by adding different alloying elements, whereas higher reheating temperatures increase the growth rate of austenite grains. the new predictive model is a function of composition and reheating conditions only, regardless of precipitate dissolution and formation. It is expected that the present model will be useful to predict the austenite grain growth of alloy steels adequately without requiring any thermodynamic calculations for the precipitation and dissolution of carbonitride-forming elements.