Dissolution of Solid Cr₂O₃ into Liquid Fe-Cr-C Alloys with CO Evolution

Abstract

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 1580°C. The initial carbon concentration is 0.3-1.4% and the rotational speed is 55-1800rpm. 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.