INFLUENCE OF DEEP CRYOGENIC TREATMENT ON THE CHANGE IN WEARRESISTANCE OF HIGH-CARBON ALLOY TOOL STEELS

Abstract

The effect of deep cryogenic treatment on the operational stability of tool steels with additional alloying with silicon, chromium, molybdenum, vanadium and tungsten was studied. High-carbon alloy steels after quenching always contain a significant amount of residual austenite, which requires energy-intensive long-term technological operations for its further decomposition, but this does not always solve the existing problem associated with their low wear resistance, especially in harsh operating conditions. It is from this point of view that during the experiments, the first batch of the studied steels was treated using standard thermal hardening technology (quenching and tempering), and the second batch was treated using standard technology with additional deep cryogenic treatment. According to the results of the research, the features of wear of high-carbon alloy steels depending on the type of final structure were established by comparative analysis. It is shown that the chemical composition, parameters of the thermal hardening regime, and the duration of the tests have different effects on the wear resistance of tool steels, however, in this study, steels that were subjected to additional deep cryogenic treatment are in all cases characterized by the lowest weight loss during abrasive wear.