Authors: A.N. Korotkov, L.P. Korotkova, D.V. Vidin, S.V. Lashchinina

Title of the article: Methodological approach in the development of the strengthening heat treatment mode for high-speed steels with low tungsten equivalent

Year: 2023, Issue: 3, Pages: 13-25

Branch of knowledge: 2.5.5. Technology and equipment for mechanical and physical-technical processing

Index UDK: 621.9.025.523

DOI: 10.26730/1999-4125-2023-3-13-25

Abstract: This work is aimed at increasing the durability of metal-cutting tools made of R6M5 high-speed steel with moderate heat resistance, manufactured in machine-building enterprises. A comparative analysis of the quality of high-speed steels of domestic and foreign manufacturers in terms of chemical composition and microstructure parameters in the state of delivery has been carried out. A methodological approach has been developed to solve the problem of improving the quality of metal-cutting tools from high-speed steels of the traditional production method by adjusting the modes of hardening heat treatment, taking into account the quality of steels in the state of delivery, as well as their operating conditions. Based on the studies carried out, typical deviations in the chemical composition and structure of steels from various manufacturers were revealed. A methodological approach has been developed to solve the problem of improving the quality of metal-cutting tools made of high-speed steels of the traditional production method through the introduction of a full-scale quality control technique, adjusting the hardening heat treatment modes, taking into account the chemical composition of the steels in the state of delivery, as well as the operating conditions of the tool. It is proposed to correct the hardening heat treatment - the temperature of hardening and tempering, to assign the frequency of tempering, taking into account the content of carbon and carbide-forming elements in accordance with the tungsten equivalent. It is shown that the grades of high-speed steels of Russian production in terms of the quality of the microstructure (in terms of non-metallic inclusions, grain score, carbide inhomogeneity score) and in the balance of the chemical composition are superior to analogues of foreign firms.

Key words: high-speed steel tungsten equivalent metal-cutting tool microstructure quality control heat treatment technology basic and technological properties tool life operating conditions

Receiving date: 15.05.2023

Approval date: 15.06.2023

Publication date: 30.06.2023

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