Effect of Mg on the evolution of non-metallic inclusions in Mn-Si-Ti deoxidised steel during solidification: experiments and thermodynamic calculations

Abstract

The effects of Mg on the evolution of non-metallic inclusions in Mn-Si-Ti deoxidised steels during solidification were investigated in a study based on experiments and thermodynamic calculations. The inclusions were composed of the MgO-MnO-Ti2O3-TiO2 oxide, MnS, and TiN. With the increase of Mg concentration in steels, the phases of oxide inclusions were changed, in the order of pseudobrookite (Ti3O5-MnTi2O5), ilmenite (MgTiO3-MnTiO3-Ti2O3) spinel (Mg2TiO4-MgTi2O4- Mn2TiO4-MnTi2O4) and MgO. Thermodynamic calculations for inclusion evolutions were in good agreement with the experimental results.