Calculation of Fe-C-B Ternary Phase Diagram

Abstract

Phase equilibria in the Fe rich portion of the Fe-C-B ternary system were analyzed on the basis of the solubility data on Fe-B system by Cameron and Morral. The Gibbs energy of solution phases was approximated by the interstitial model, assuming C and B to be interstitial atoms. The influence of ferromagnetism on the Gibbs energy of ferrite was also taken into account. The effect of B addition on the pure austenite field was calculated precisely, and it was confirmed that the equilibrium distribution coefficient of B between liquid and austenite is much smaller than that evaluated previously.