Optimization strategies for identifying the controlling mechanism for solid-state transformation in FeCrNi during rapid solidification

Abstract

Retained free energy drives the transformation from metastable to stable phase during double recalescence of steel alloys. Statistical methods were used to identify the mechanism controlling cluster growth based on the principle of microstructural reversibility. Application of the coefficient of determination during optimization procedures showed that an extrinsic mechanism controls nucleation and that negligible healing occurs such that retained free energy from primary phase undercooling and melt convection enhance secondary nucleation.