Oxide Solubility Minimum in Liquid Fe- M -O Alloy

摘要: The origin of the solubility minimum oxide ( $$ {M}_x\text{O}_y$$ ) in liquid Fe-M-O alloy was investigated, and predicted based on thermodynamic calculations. Due to characteristic property activities M O liquid, a maximum exists product between two if affinity is significantly high, as most deoxidizing elements are. A critical activity defined, which an indicator according following relationship: $${{\text{max}}}(a_M^x \times a_{\underline{{{\text{O}}}}}^y) = {K_{M_x{{\text{O}}}_y}\times a_{M_x{{\text{O}}}_y}}$$ , where $$a_{M_x{{\text{O}}}_y}$$ unity equilibrium with pure $$M_x{{\text{O}}}_y$$ . explained using change by composition. Available CALPHAD assessments for several binary Fe-M alloys Wagner’s solvation shell model were combined calculate alloy, can be used predict favorable agreement obtained when $$M {\text{Al}}$$ B, Cr, Mn, Nb, Si, Ta, Ti, V, Zr. Gibbs energy dissolution $$\Delta g^\circ _{\underline{{{\text{O}}}}(M)}$$ formation per mole atoms _{M_x{{\text{O}}}_y}/(x+y)$$ play important roles determining minimum, long interaction Fe less significant than metal (Fe M) O. Predictions minima CaO MgO not satisfactory, requiring further improvement present analysis.