Calculation of α-γ Phase Boundaries in Dilute Fe and Fe-C Base Multicomponent Alloys from the Central Atoms Model

Abstract

The generalized central atoms model of multicomponent interstitial solutions is placed in a form which permits direct application to the calculation of α-γ phase boundaries in dilute Fe and Fe-C base multicomponent alloys. Example calculations are made of the ortho and paraequilibrium boundaries in the systems containing two species of substitutional alloying elements in which experimental data on carbon activity, equilibrium tie-line and/or phase boundaries are available. The calculation can be readily extended to the systems containing more than two species of alloying elements. It is expected that the use of this model facilitates the evaluation of thermodynamics of α-γ transformation in steel.