DOI: 10.52150/2522-9117-2024-38-656-671

Povorotnia Iryna Romanivna, Ph. D. (Tech.), Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-5872-7403

Safronova Olena Anatoliivna, Junior Researcher, Ph. D. Student, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-4032-4275. E-mail: safronovaaa77@gmail.com

Podolsky Rostyslav Viacheslavovych, Ph. D. (Tech.), Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-0288-0641. E-mail: rostislavpodolskij@gmail.com

Oliinyk Eduard Vadymovych, Ph. D. Student, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-3366-3746. Email: ediknsk@gmail.com

INFLUENCE OF CHEMICAL COMPOSITION ON THE PHASE STRUCTURE AND HARDNESS OF CARBON STEEL FOR RAILWAY AXLES AFTER DEFORMATION AND HEAT TREATMENT

Abstract. Given the considerable number of complex approaches using information technologies to justify the choice of the content of chemical elements in steel and the limitations inherent in them, the use of the concept of directional chemical bonding is proposed, which ensures high predictive accuracy and obtaining the necessary properties at the level demanded by the consumer. The paper analyzes the requirements of regulatory documentation regarding the chemical composition, namely the content of the main components such as carbon, manganese and silicon, in steel for railway axles of grades EA1N, F and OC. Information technologies were applied using the concept of directed interatomic interaction, when the criteria are complex and characterize the entire composition simultaneously, and linear patterns of the influence of the integral indicator of the chemical composition on hardness were obtained. The purpose of the study is to establish the patterns of the influence of chemical composition on the formation and transformation of the phase structure and hardness after deformation and thermal annealing of carbon steel for railway axles The object of research was laboratory ingots of carbon steels, which are comparable in chemical composition to steels for railway axles in accordance with state, European and American standards. The samples made from them were subjected to hot plastic deformation (HPD) followed by heat treatment (HPD+HT). A microstructural analysis of the studied steels was carried out. The regularities of the influence of chemical composition on the phase ratio and hardness of the studied steels in different states were revealed: as-cast, after HPD and HPD+HT using the concept of directional chemical bonding. It was established that for an integral parameter of the charge state (Z^Y) less than 1.20 e, that is, for a certain chemical composition in the studied interval of values, the hardness of steel in the state after GPA exceeds the hardness of such steel in the state after HPD+HT.

Key words: railway axles, national standard, chemical composition, mechanical properties, microstructure.

DOI: https://doi.org/10.52150/2522-9117-2024-38-656-671

For citation: Povorotnia, I. R., Safronova, O. A., Podolsky, R. V., & Oliinyk, E. V. (2024). Influence of chemical composition on the phase structure and hardness of carbon steel for railway axles after deformation and heat treatment. Fundamental and applied problems of ferrous metallurgy, 38, 656-671. https://doi.org/10.52150/2522-9117-2024-38-656-671

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