Abstract
A multiphase equilibrium calculation, based on IRSID’s statistical thermodynamics slag model, is used to predict the composition of endogeneous oxide and sulphide inclusions precipitated as a result of the deoxidation treatment, during metal solidification, or due to late reoxidations. This evaluation shows that the composition of inclusions is strongly affected by the content of trace elements (Ca, Mg and Al) in the steel. On the basis of these models, the monitoring of inclusion control by calcium treatment (Al-killed steels), or slag treatment (semi-killed steels) will be discussed.
Résumé
Un programme de calcul d’équilibre polyphasé, basé sur le modèle de thermodynamique statistique des laitiers développé à I’lRSID est utilisé pour prédire la composition des inclusions d’oxydes et de sulfures précipitant dans I’acier à la suite du traitement de désoxydation, pendant la solidification du métal, ou du fait de réoxydations à la coulée. Cette évaluation indique que la composition inclusionnaire est imposée par la teneur du métal en éléments traces (Ca, Mg et AI). L’optimisation du contrôle inclusionnaire par traitement calcium (aciers calmés AI) ou traitement métal-laitier en poche (aciers faiblement desoxydés) est discutée sur la base de ces modèles.
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Gaye, H., Gatellier, C., Lehmann, J. (1998). Thermodynamic Models for Monitoring Deoxidation Treatments and Controlling Inclusions in Steels. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_16
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DOI: https://doi.org/10.1007/978-3-642-72207-3_16
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