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Metallurgist

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08-07-2024

Microstructure and mechanical property formation of heat treated low-carbon chromium-nickel-molybdenum steels

Authors: M. V. Maisuradze, A. A. Kuklina, V. V. Nazarova, M. A. Ryzhkov, E. V. Antakov

Published in: Metallurgist | Issue 3/2024

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Abstract

Low-carbon Cr-Ni-Mo steels widely used in mechanical engineering are studied: 18Kh2N4MA, 25Kh2N4MA, 25KhN3MA. Thermokinetic diagrams are plotted by a dilatometric method. Temperature-time ranges for microstructure constituent formation are established. It is shown that bainite within the steels studied may be formed both above and below the M_s temperature. Features of isothermal bainite transformation are investigated, kinetics of bainite transformation are determined, as well as the quantitative ratio of microstructure constituents formed as a result of austempering. It is established that the largest amount of bainite within the steel structures studied (80–95%) is achieved at a temperature near M_s. Mechanical properties (strength, ductility, impact strength) of the steels being studied are analyzed after various heat treatment methods: various cooling intensities, upper and lower bainite austempering. It is shown that formation of upper bainite has an ambiguous effect on steel impact strength.

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Title: Microstructure and mechanical property formation of heat treated low-carbon chromium-nickel-molybdenum steels
Authors: M. V. Maisuradze
A. A. Kuklina
V. V. Nazarova
M. A. Ryzhkov
E. V. Antakov
Publication date: 08-07-2024
Publisher: Springer US
Published in: Metallurgist / Issue 3/2024
Print ISSN: 0026-0894
Electronic ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-024-01732-3

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