ASSESSMENT OF THE INFLUENCE OF HEAT TREATMENT MODES USING NEGATIVE TEMPERATURES ON THE MECHANICAL PROPERTIES OF ShKh15 STEEL. PART II: THE INFLUENCE OF HEAT TREATMENT MODES ON THE STRUCTURAL-PHASE STATE AND MICROSTRUCTURE

10.25712/ASTU.1811-1416.2024.02.014

Authors

  • Sergey A. Zemlyakov LLC UK «Altai Precision Products Plant», Cosmonauts Str., 6/2, Barnaul, 656023, Russia; I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia; Wuhan Textile University, FangZhi Road, 1, Wuhan, 430073, China
  • Mikhail N. Zenin I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia
  • Sergey G. Ivanov I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia; Wuhan Textile University, FangZhi Road, 1, Wuhan, 430073, China https://orcid.org/0000-0002-5965-0249
  • Mikhail A. Guryev I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia; Wuhan Textile University, FangZhi Road, 1, Wuhan, 430073, China; Zhejiang Briliant Refrigeration Equipment Co., Ltd., Ruao Industry Park, Xingchang, Zhejiang Province, 312500, China https://orcid.org/0000-0002-9191-1787
  • Evgeniya V. Chernykh I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia https://orcid.org/0000-0002-1128-8471
  • Alexey M. Guryev I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia; Wuhan Textile University, FangZhi Road, 1, Wuhan, 430073, China https://orcid.org/0000-0002-7570-8877
  • Denis I. Ziuzin I.I. Polzunov Altai State Technical University, Lenin Pr., 46, Barnaul, 656038, Russia

Keywords:

structural bearing steel ShKh15, heat treatment, microstructure, tensile strength, impact strength, hardness, austenite, martensite

Abstract

The presence of retained austenite is undesirable in the case of manufacturing precision parts from ShKh15 steel due to the fact that during operation its transformation into martensite is inevitable, which results in a change in the geometric dimensions of the parts, which ultimately can lead to jamming of precision pairs, or the formation of cracks and failure building a precision unit or assembly. This study shows the change in the structural-phase state and microstructure of hardened structural steel ShKh15 depending on the temperature regime of tempering and cold treatment. It has been established that stimulation of martensitic transformation by cold treatment or cryogenic treatment leads to fragmentation of austenite inclusions, while slightly reducing the total content of retained austenite. The size of carbide inclusions in the case of cold treatment or cryogenic treatment can be considered invariant, while the total number of particles of carbide precipitates increases by 6.5 and 8.4 times, respectively, in the case of cold treatment at -60 °C and cryogenic treatment at -196 °C compared to traditional heat treatment.

Downloads

Published

2024-06-28

How to Cite

Zemlyakov С. А. ., Zenin М. Н. ., Ivanov С. Г. ., Guryev М. А. ., Chernykh Е. В. ., Guryev А. М. ., & Ziuzin Д. И. . (2024). ASSESSMENT OF THE INFLUENCE OF HEAT TREATMENT MODES USING NEGATIVE TEMPERATURES ON THE MECHANICAL PROPERTIES OF ShKh15 STEEL. PART II: THE INFLUENCE OF HEAT TREATMENT MODES ON THE STRUCTURAL-PHASE STATE AND MICROSTRUCTURE: 10.25712/ASTU.1811-1416.2024.02.014. Fundamental’nye Problemy Sovremennogo Materialovedenia / Basic Problems of Material Science, 21(2), 254–262. Retrieved from http://ojs.altstu.ru/index.php/fpsm/article/view/786

Issue

Vol. 21 No. 2 (2024): Fundamental’nye problemy sovremennogo materialovedenia (Basic Problems of Material Science (BPMS))

Section

SECTION 2. METAL SCIENCE AND HEAT TREATMENT OF METALS AND ALLOYS