Abstract
The morphology changes of the inclusions in molten Fe-42mass % Ni alloy were investigated in the Si-Mn complex deoxidation experiments under CaO-SiO2-Al2O3-MgO slags in order to clarify the mechanism of the morphology control of the inclusions by means of the slag-metal-inclusions reactions.
An increase in the Al2O3 content of SiO2-MnO inclusions was observed in the process of the deoxidation with time. As the result, SiO2-MnO-Al2O3 ductile inclusions could be produced in Fe-Ni alloy. This was caused by the decomposition of Al2O3 in slag, and the reaction between aluminum in molten alloy and the inclusions. An increasing amount of MgO in the inclusions was also observed simultaneously in that process. That phenomenon caused the formation of MgO-Al2O3 spinel inclusion. It was presumed that transportation of Mg from slags to inclusions would be occurred as the result of the chemical reaction in the same manner as that of aluminum.
