Morphology of products from the carbon reduction of Fe-Cr-O systems

The morphology of the reduction products of Fe-Cr-O systems by C at different temperatures and time intervals was studied in this paper. The samples include two systems of FeCr₂O₄ +C and Fe₂O₃ +2Cr₂O₃ +C. It is found that the reduction degrees of the two samples increase with increasing temperature, and the reduction degree can be above 90% when the reaction is close to balance. The reduction processes of FeCr₂O₄ and Fe₂O₃-Cr₂O₃ are similar and the final reduction products are composed of Fe-Cr-C alloys and metal carbides (mainly Cr₇C₃). A method was proposed to estimate the contents of Fe-Cr-C alloys and metal carbides in the final reduction products, and the estimated results agree with the calculated data. It is shown that the content of Fe-Cr-C alloys increases while the content of metal carbides decreases with increasing temperature, and the composition of Fe-Cr-C alloys varies with temperature.