Abstract
In the current study, the stability diagrams of Mg-Al-O system in molten steel are calculated using two methods. After comparing the result of connecting iso-oxygen contours of different phases (iso-oxygen contours method) and calculating the border lines of different phases (border lines method), the former method is more accurate and popular. Particularly, the detailed calculation procedures and connection line principles of stability diagram are exhibited. The effects of interaction coefficient, temperature, and activity of oxides on the stability diagram are also discussed. With the currently reported method, stability diagrams of various inclusions in molten steel can be calculated to predict the formation of inclusions.
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