METHODOLOGICAL APPROACH TO THE DETERMINATION OF THE EFFECTIVE COMPONENT COMPOSITION OF CARBON STEELS FOR THE RESPONSIBLE APPOINTMENT

Abstract

Of particular importance in the metallurgical industry is the issue of optimizing the chemical composition of steel in order to ensure the required level of properties. However, a significant number of modern complex approaches are based on the application of information technologies. The purpose of the work is to study the influence of the chemical composition of carbon steels on the formation of their microstructure and hardness. As part of the research, experimental ingots of carbon steels of various compositions were melted, which were then subjected to hot plastic deformation (HPD) followed by heat treatment (HPD+HT). The research material was laboratory steels, which are comparable in chemical composition to steels for railway axles according to the state standard, European and American standard. During the research, it was found that the chemical composition affects the number of structural components and the hardness of the studied steels in different states, such as cast, after HPD and HPD +TO. It was found that for a certain chemical composition, in which the value of the integral parameter of the state of charge (ZY) is less than 0.20 e, the hardness of steel in the state after HPD exceeds the hardness of steel in the state after HPD +TO.