Manyak M. The theory development and production technology improvement of steel with regulated microcomposition for it's quality rise

The thesis is devoted to the further development of theory and technology for production of steel with the regulated microcomposition for improving its guality. The work employs theoretical and experimental methods of research: thermodynamics analysis, research of surface tension; X-ray structural analysis, Auger spectroscopy, internal friction, high-temperature metallography, raster microscopy, research planning. The mechanism of surface active elements influence on the process of formation of casting structure of steel is developed; the series of surface activity of elements towards iron is determined; the possibility of producing ingots of highly alloyed frauds of steel, using the method of complex alloying during electric slag remelting is scientifically grounded and experimentally proved; vision about the mechanism of iron reduction from oxides contained in pellets is elaborated; kinetics of admixtures redistribution process in the grain boundary zone taking into account their fraction of total mass, temperature and the size of austenic grain is theoretically and experimentally investigated; a new kind of blend for electric melting is developed. The results of work have been introduced into the production process with the economic effect of 1.94 mln rubles (the level of prices-before 1991). The spheres of use are metallurgy and machine-building.