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Synopsis: A kinetic study has been carried out on the dissolution of Cr2O3 into liquid iron by immersing a rotating solid Cr2O3 cylinder into Fe-10%Cr-C alloys at 1 580•Ž. The initial carbon concentration is 0.3-1.4% and the rotational speed is 55-1 800rpm. At the initial carbon concentration of 0.3%, dissolution rate increases with increasing rotational speed. On the other hand, at higher carbon contents, the dissolution rate is determined substantially by the extent of CO evolution. It is shown that the dissolution rate is controlled by the rate of mass transfer of oxygen across the boundary layer in the metal at the solid—melt interface.

Dissolution of Solid Cr<SUB>2</SUB>O<SUB>3</SUB> into Liquid Fe-Cr-C Alloys with CO Evolution