DOI: 10.52150/2522-9117-2024-38-621-631

Lutsenko Vladyslav Anatoliiovych, D. Sc. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-4604-5592

Golubenko Tetiana Mykolaivna, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-3583-211X. E-mail: sumer@i.ua

Lutsenko Olha Vladyslavivna, 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: 0000-0001-8298-5306

THE INFLUENCE OF PROCESSING PARAMETERS ON THE STRUCTURE AND PROPERTIES OF THE LOW-CARBON STEEL

Abstract. The bar sections of the round diameter from the low-carbon steels of SAE brands requires continuous improvement of the reliable quality assurance system. The processes that include temperature-rate cooling parameters after hot rolling, which ensure the formation of the homogeneity of the structure and properties, are promising. Depending on the conditions of the hot deformation in the rolled steel products, can be observed the different structural states, which are fixed by cooling and determine the properties of the metal. If the metal is subjected to holding at the temperature of the end of deformation, then it undergoes the processes of collection recrystallization, which appears as the formation of the coherent nucleus, capable of the further growth. In the steels with low carbon content, after hot deformation, the austenite grain refining leads to a decrease in the size of pearlite areas. The formation of the large austenite grains due to the collection recrystallization leads to a decrease in the amount of structurally free ferrite. The most important microstructural parameter is grain size, which is one of the most effective ways to control the structure, leading to changes in mechanical properties. Investigated the bar sections of the low-carbon steels of SAE 1008 brands after hot rolling in the cleanliness wire block and cooling with water before allocation into wire wraps to different temperatures higher than А₁, and then cooling in air to ambient temperatures. The metallographic studies allowed to establish the influence of the heat treatment parameters on the structure of the studied steel, which is ferrite with small areas of lamellar pearlite. After high-speed hot deformation, the average conditional grain diameter is affected by heat treatment, namely the temperature of the end of the cooling, was established by the conducted computational and analytical studies. For the rolled steel products of the SAE brands, it is rational to perform cooling after hot deformation to temperatures of the order of А₁ + 150ºС with subsequent slow cooling, during which a more uniform grain is formed, which will ensure minimal variation in the mechanical properties.

Keywords: low-carbon steel, bar sections, temperature, cooling, structure, grain size, mechanical properties.

DOI: https://doi.org/10.52150/2522-9117-2024-38-621-631

For citation: Lutsenko, V. A., Golubenko, T. M., & Lutsenko, O. V. (2024). The influence of processing parameters on the structure and properties of the low-carbon steel. Fundamental and applied problems of ferrous metallurgy, 38, 621-631. https://doi.org/10.52150/2522-9117-2024-38-621-631

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