Abstract
The effect of Al on the evolution of non-metallic inclusions in the Mn-Si-Ti-Mg deoxidized steels during solidification were investigated based on the experiments and thermodynamic calculations. The inclusions belonged to the MgO-TiO 2 -Ti 2 O 3 -Al 2 O 3 +MnS+TiN system. In particular, the major oxide inclusion was the Mg-Ti-Al-O spinel phase of which composition was continuously changed from the Mg-Ti-O to MgAl 2 O 4 with the concentration Al in steels. The spinel compositions calculated from thermodynamic databases are in good agreement with experimental results. TiN was only observed on the surface of MnS. MgAl 2 O 4 aggregates were also observed at high Al concentration. In general, the evolution of inclusions is well explained by thermodynamic calculations.
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