DOI: 10.52150/2522-9117-2023-37-465-475

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 TEMPERATURE ON THE STRUCTURE FORMATION OF THE Cr-Mo-V STEEL

Abstract. The main way to improve the quality characteristics of the steel is a properly selected heat treatment, the purpose of which is to create a structure that would meet the requirements of the manufacturer. The size of the austenite grain in the steel depends significantly on the heating temperature during heat treatment, which in turn affects the final structure of the steel and mechanical properties after treatment. The experimental chromium molybdenum vanadium steel 31CrMoV9 (EN 10085:2001) was heated to temperatures in the range of 850…1050°C and cooled in water and air. The structure formation of the Cr-Mo-V steel after heating to different temperatures, quenching and tempering, consists of tempered martensite (including residual austenite) and alloyed carbides, and after normalization – bainite and martensite with different ratios. As the normalization temperature increases, the total area occupied by martensite increases without changing its morphology. The increase in the heating temperature leads to an increase in the amount of martensite from 10% at 850°С to 50% at 1050°С, correspondingly, the microhardness of the steel increases, shown by research. With an increase in the tempering temperature, the average microhardness of steel decreases. The change in microhardness is probably associated with an increase in the amount of the residual austenite and the dissolution of alloyed carbides. Detected that with an increase in the heating temperature, the increase in the initial austenite grain led to the coarsening of martensite needles. The effect of the increasing the austenization temperature on the change in the structure of the Cr-Mo-V steel was shown during investigations. Detected that the temperature of the austenization affects the cooling rate. To obtain more detailed results of this effect, it is necessary to conduct additional investigations of the kinetics of the transformations in the Cr-Mo-V steel upon cooling from different temperatures. The obtained results make it possible to tentatively predict the final structure of the Cr-Mo-V steel after various modes of the heat treatment. Heating should be carried out at a temperature of 850ºС, which will additionally lead to resource saving to get a uniform structure in the Cr-Mo-V steel.

Key words: chromium-molybdenum-vanadium steel, heating temperature, structure, grain size, bainite, martensite, heat treatment, quenching, normalization.

DOI: https://doi.org/10.52150/2522-9117-2023-37-465-475

For citation: Lutsenko, V. A., Golubenko, T. М., & Lutsenko, О. V. (2023).The influence of processing temperature on the structure formation of the Cr-Mo-V steel. Fundamental and applied problems of ferrous metallurgy, 37, 465-475. https://doi.org/10.52150/2522-9117-2023-37-465-475

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