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 Fe 3 C, 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.
Highlights
One of the alternative sources to obtain doping materials is the processing and return to production of doped anthropogenic waste the large volumes of which are not used in practice effectively enough
At the same time, it remains to be determined the phase composition and microstructure of the reduced products from anthropogenic raw materials, which are complexly doped with refractory elements, when the amount of oxygen to carbon in the charge is changed
It is advisable to study the features of the phase composition, the microstructure of doping raw materials obtained through reduction smelting, when changing the parameters of the charge based on a mixture of anthropogenic waste from steels and alloys doped with refractory elements
Summary
A. Poliakov PhD, Associate Professor Department of Machine Repair, Operation of Energy and Labor Protection Luhansk National Agrarian University Slobozhanska str., 68, Starobilsk, Ukraine, 92703. V. Bratishko Doctor of Technical Sciences, Senior Researcher Department of Transport Technologies and Means in AIC National University of Life and Environmental Sciences of Ukraine. PhD, Senior Researcher, Head of Department Department of Biotechnical Systems in Animal Husbandry and Harvesting of Forages National Scientific Center "Institute of Mechanization and Electrification of Agriculture". Soniachna str., 3, Vinnytsia, Ukraine, 21008 *Research Laboratory of Applied Materials Science Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University” Mashynobudivnykiv blvd., 32, Kramatorsk, Ukraine, 84313 **Department of Occupational, Technogenic and Environmental Safety. National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023
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