Evaluation of Computer Model Results for Thermodynamic and Kinetic Calculation of Phase Transformation in a Middle-Carbon Alloyed Steel

The phase composition of medium-carbon steel containing Cr, Mn, and Ni within the 1520C-to-340C temperature range is analysed using the CALPHAD method.Unlike the paraequilibrium approximation, this approach considers the redistribution of alloying elements between phases, crucial for modelling the kinetics of transformations.It allows for determining the decomposition of pearlitic transformation in a multicomponent system within this temperature interval.Verification of the developed computer model for the transformation of supercooled austenite is conducted by comparing it with reference data.The model constructs satisfactorily a thermokinetic diagram, but exhibits certain deviations.Nevertheless, the model predicts accurately cooling rates leading to martensite, ferrite, and bainite formation.