A thermodynamic model for deoxidation equilibria in steel |
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Authors: | In-Ho Jung Sergei A Decterov Arthur D Pelton |
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Affiliation: | (1) the New Metals Research Team, Research Institute of Industrial Science & Technology (RIST), 790-600 Pohang, South Korea;(2) the CRCT, Ecole Polytechnique de Montreal, H3C 3A7 Montreal, PQ, Canada |
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Abstract: | For relattively dilute solutions of oxygen and a deoxidizer M (M=Al, Cr, Ca, Mg, ...) in molten Fe, a thermodynamic model
is proposed wherein the dissolved species are M*O associates as well as unassociated M and O atoms. At higher metal concentrations, a small amount of M
2*O associates also form. Experimental deoxidation equilibria for 15 deoxidizers M are quantitatively reproduced at all temperatures,
with only a constant, temperature-independent and composition-independent empirical parameter for the Gibbs energy of formation
of each associate. The deoxidation behavior of Mg, Ca, and Ba is elucidated for the first time. The parameters are stored
in a database, which can be used to predict complex deoxidation equilibria in multicomponent steels. |
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