Nonisothermal reduction of oxides in carbon-saturated melts

The nonisothermal kinetics of carbon reduction of oxides in carbon-saturated melts has been studied. The numerical procedure involves the consecutive resolution and subtraction of individual peaks from a total evolution curve. The temperature-dependent background evolution and mixing effects in the gas system of the analyzer were also taken into account. The OxSeP original software allowing us to process FGA data has been realized for the modern TC-600 LECO gas analyzer. The problem of identification of oxides was found to be connected with the start temperature of carbothermal reduction of oxides (Ts). A considerable discrepancy between the equilibrium reduction temperatures of oxides calculated by thermodynamics and real values is observed. The identification OxID software, which includes a thermodynamic model of carbon reduction of oxide inclusions and dissociation of nitrides during the analysis, was developed. Results of numerous FGA studies of synthesized alloys and different steels are in a good agreement with experimental data obtained by X-ray microprobe analysis and quantitative metallography