Vlasovets V. Improvement of mechanical properties of the working lining of items made of iron carbon alloys and development of a non-destructive method of their evaluation by the coercitive force

The thesis work sets forth scientifically proven developments in material sciences, ensuring solution of an important scientific and technical problem of improvement of mechanical properties of material of products' working lining through a complex action - inoculation, alloying and heat treatment with their evaluation by the nondestructive method. The specific features of formation of a structure of working lining of solid items - rolls were analyzed; the ways to optimize them depending on the operation conditions were shown. The regularities of structure formation were generalized and the relationship between the mechanical properties of the working lining of items made of pro-, hypereutectoid steels and cast irons of various doping degree and Нс were established, which were proposed for use to substantiate the directions of increasing the level of characteristics. New compositions of high-chromium iron and precipitation-hardening steel were developed, the optimum ratio between the quantities of inoculants, heat treatment modes, microalloying admixtures based on power production waste when applying coating has been defined, which made it possible to increase the complex of mechanical properties of the items working lining by 20-30% at the average. Implementation of results protected by patents of Ukraine at the enterprises made it possible to gain the overall economic effect amounting to UAH ths. 2412,267.