Thermodynamics of magnesium, aluminium, carbon and yttrium interaction with oxygen in the molten iron-based metal

Creating the metal quality system is largely determined by establishing the finishing processes of steel refining, rational microalloying, and modifying the metal and non-metallic inclusion structures. It becomes possible due to defining the each component role in the complex alloys, alloying compositions and mixed modifiers. The thermodynamic modeling of metal components interaction with non-metallic impurities, in particular, with oxygen, may assist in solving such tasks. The output products of such modeling can be special state diagrams of component solubility surfaces. In this work the complex of thermodynamic parameters is selected and a method of creating the surfaces of component solubility for Fe-Mg-Al-Y-O-C system is developed. The first state diagram of the MgO-Al2O3-Y2O3 oxide system is created based on the thermodynamic calculation, and it allows creating a thermodynamic model of deep steel deoxidation with aluminium, magnesium, and yttrium, relating to pre-existing data for FeO-Al2O3-Y2O3, FeO-Al2O3-MgO, FeO-MgO-Y2O3 oxide systems with possible expanded calculations for more complex systems.