Thermodynamic calculations of phase equilibria in the Fe-Cr-S system

Phase equilibria in the Fe-Cr-S system were analyzed on the basis of the th ermodynamic evaluation of the Fe-FeS, Fe-Cr, Cr-CrS and Fe-FeS-CrS-Cr syste ms. The Gibbs energy of individual phase was approximated by the two sub-la ttice model for describing the thermodynamic properties Most of the experim ental information was well described by the present set of thermodynamic pa rameters, in particular, the calculated liquidus surface in the Fe-rich por tion and the solubilities of S in the fcc and the bcc phases were shown to be in excellent agreement with experimental results. Discrepancies observed in some experimental phase diagrams were explained on the basis of the cal culated results.