Features of the Heat Treatment of High Speed Steel

Abstract

The aim of the study was to determine the optimal heat treatment for cast steel P6M5F3 to ensure an increase in impact strength, under conditions of impact loads (planing cutters), minimize carbide liquation and compare with the impact strength of powder steel P6M5F3-MP. For the study, the issue of quenching P6M5F3 steel by simultaneous tempering was considered in order to select optimal values of impact strength, since the reliability of the tool is provided along with high hardness and high impact strength, especially with intermittent turning. Intensive separation of alloying elements and carbon from the residual austenite during its recrystallization makes it possible to apply the proposed method for the efficient and rational use of high-speed steels operating under conditions of increased dynamic loads, which require increased toughness. An increase in the temperature of the martensitic transformation interval as a result of heating indicates a significant depletion of residual austenite with carbon and alloying components during the holding of samples at these temperatures. The proposed heat treatment of high-speed steel allows, unlike the known methods, to completely avoid the martensitic transformation of high-temperature austenite into lamellar martensite, which causes a noticeable decrease in the strength and viscosity of the steel.