Abstract
The effect of the rapid cryogenic treatment on hardness and wear resistance of several kinds of tool steel was examined. Two ways of cryogenic cooling were evaluated: direct immersion of the metallic samples into liquid nitrogen and three-stage rapid cryogenic cooling (1 – precooling in LN2 to -20°C, 2 – formation on the sample of a frost layer from air by natural humidity, 3 – second cooling of the frost-covered sample in LN2 to -195.7°C). Material in “as is” conditions and after a preliminary heat treatment (850°C) were used as the reference points.The HV microhardness and the wear rate under dry abrasive friction were evaluated. Despite the very different types of the examined metals’ nature, microstructure, and hardening mechanisms, the rapid cryogenic cooling improves both the hardness and the wear resistance values. For all investigated metals rapid cryogenic cooling assisted with the frost layer produces the best results.
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