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Features of the Phase and Structural Transformations in the Processing of Industrial Waste From the Production of High-Alloyed Steels

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Abstract: We have investigated the physical and chemical properties of the alloy obtained by reduction smelting using wastes from the production of highly-alloyed steels and alloys. This is necessary to determine the technological aspects that reduce the loss of doping components when obtaining and using a doping alloy. The study results indicate that at the charge s oxygen-to-carbon ratio of 2.25, the alloy consisted mainly of a solid solution of doping elements in γ-Fe. At the charge s oxygen-to-carbon ratio of 1.67, we also observed Fe3C, followed by an increase in the intensity of carbide manifestation at the oxygen-to-carbon ratio of 1.19. Photographs of the microstructure clearly showed several phases with a different ratio of doping elements. The Ni content in the examined sections of various phases changed within 1.38‒46.38 by weight, Cr ‒ 3.45‒45.32 by weight, W ‒ 1.51‒27.32 by weight, Mo ‒ 0.48‒10.38 by weight. Mo, W, Nb mostly concentrated in individual particles. The Nb content in some inclusions reached 47.62 by weight. Analysis of the study results has shown that the most beneficial charge s oxygen-to-carbon ratio is 1.67. At the same time, the phase composition is dominated by a solid solution of doping elements in γ-Fe. The proportion of residual carbon, which was in the form of a carbide component, accepted values in the range of 0.52‒2.32 by weight while providing the necessary reducing capacity when using the alloy. Our research has identified new technological aspects in the processing of highly-alloyed anthropogenic waste when obtaining an alloy with a relatively low residual carbon content. The resulting parameters of the resource-saving doping material ensure the possibility to replace some of the standard ferroalloys when smelting steels with certain carbon content restrictions.

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