K. V. Makhneva, I. B. Kinzin, M. A. Shabanov, O. V. Selivanova, V. A. Khotinov

EFFECT OF TEMPERING CONDITIONS ON THE STRUCTURE AND STRENGTH PROPERTIES OF STRUCTURAL STEELS

The structure and mechanical properties of low- and medium-carbon steels quenched and tempered with different isothermal holding times at temperatures ranging from 250 to 650 °C are studied. It is shown that, for the steels under study, three stages can be distinguished on the curves of hardness as a function of isothermal holding at different temperatures. Hardness testing is used to determine tempering conditions leading to a comparable level of hardness. To calculate the tempering parameter, the constant C in the Hollomon–Jaffe equation is determined for the steels in question.

Acknowledgment: The work financially supported by the Ministry of Science and Higher Education of the Rus-sian Federation (the Ural Federal University Development Program within the framework of the Priority 2030 program). The equipment of the UrFU’s shared research facilities was used in the testing.

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