Oxygen and nitrogen reactions in Fe-X and Fe-Cr-Ni-X melts

A modified epsilon formalism is developed to perform thermodynamic analysis for metallic solutions. The model calculation is successfully applied to d escribe oxygen and nitrogen equilibria in both liquid iron and alloyed stee l melts. Relations between oxygen activities or contents and composition of Fe-O-X (X = Si, Cr, Ti and Al) melts are given quantitatively. The results are widely supported by the available experimental results. Nitrogen solub ilities in Fe-Cr and Fe-Cr-Ni melts predicted by the present model calculat ion feature good agreement with experimental results.