Kinetics of the reduction-oxidation processes taking place during the heating of powders produced from cast iron swarf
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An investigation was carried out, using the methods of gravimetric and chromatographic analyses, into the kinetics of the reduction-oxidation annealing (self-annealing) of cast iron swarf powders in an inert atmosphere. Reduction-oxidation was found to occur in two stages, in the temperature ranges 798–1163 and 1163–1523°K, respectively. The dominant process in the first stage was reduction of oxides by combined carbon, and in the second stage, reduction of oxides by gaseous CO. A study was made of the effect of density of material being heated on its degree of decarburization. The least decarburization of material was recorded during the heating of a loosely poured powder, and the greatest decarburization, during the heating of compacts with a relative density of 0.4%.
KeywordsOxide Iron Atmosphere Relative Density Cast Iron
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