Search academic texts

Information × Registration Number 0224U001997, 0123U102990 , R & D reports Title Research on the influence of chemical and structural heterogeneity of carbon steels on the reliability of large-sized rolled metal for railway purposes popup.stage_title Head Povorotnia Iryna R., Кандидат технічних наук Registration Date 03-02-2024 Organization Institute of Ferrous Metallurgy. ZI Nekrasov of the National Academy of Sciences of Ukraine popup.description2 As part of this work, experimental ingots of carbon steels of different chemical composition were melted. The samples were subjected to hot plastic deformation and heat treatment. Hot plastic deformation was carried out by the method of deposition at a temperature of 1260˚C by 50%. The next heat treatment consisted of normalization from 850˚С. According to the results of the metallographic study, the quantitative ratio of pearlite and ferrite in the test samples in the cast state, after hot plastic deformation and after subsequent heat treatment was calculated. The hardness of the experimental steels in different states was determined by the Brinell method. The phase composition was determined using ImageJ software. The fundamental role of carbon in the formation of the amount of the pearlite component and hardness has been confirmed. A fragmentary influence of the manganese content on the amount of pearlite in the experimental samples after heat treatment was established, which increases with the increase in the content of this element. A close relationship between vanadium and the amount of pearlite component in the state after hot plastic deformation and partially after hot plastic deformation with subsequent heat treatment was revealed. Aluminum also has a fragmentary effect - with an increase in the content of this element, the amount of pearlite partially decreases, and for the other part of the melts of experimental steels, on the contrary, the share of pearlite increases with an increase in the content of aluminum. An analysis of the effect of the chemical composition was also carried out using parameters of interatomic interaction based on the concept of directional chemical bonding. ZY is an integral parameter of the charge state of the system, which is determined by averaging the effective charges of all types of connections of the steel components. Product Description popup.authors Oliinyk Eduard V. Povorotnia Iryna R. Podolskyi Rostyslav V. Safronova Olena A. popup.nrat_date 2024-02-03 Close