Abstract
The article presents the results of experimental studies that establish the features of increasing the strength and wear resistance of steels after thermocycling. Thermocyclic treatment as a method of heat treatment is based on continuous accumulation from cycle to cycle of positive changes in the structure of metals. An important feature of the cycle is its intensity, the absence or the presence of short exposures, and the optimal range of temperature changes. The paper establishes the laws of the influence of the temperature-time parameters of thermocyclic processing on the physicomechanical properties of tool steel and the technology of hardening machine parts due to the intensification of diffusion processes, phase and structural transformations, which reduce the duration of heat treatment and improve the whole complex of mechanical properties, that is the reliability of machine parts. Based on theoretical and experimental studies, it has been established that the production of ultrafine grains contributes to an increase in the wear resistance of steels. When using thermal cycling, higher characteristics of mechanical properties were obtained, fracture toughness increased by 1.5 times, and wear resistance increased by 1.9 times. This is due to the nature of the resulting structure and the degree of grain refinement.
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