INVESTIGATION OF WEAR-RESISTANT MATERIALS WORKING UNDER SHOCK-ABRASIVE WEAR CONDITIONS AND TEST CONDITIONS

During operation, static and dynamic loads, as well as various types of friction and wear, can simultaneously act on parts of machines and mechanisms. In these cases, as a rule, the problem of ensuring the wear resistance of parts is secondary, since, first of all, it is necessary to give structural elements strength, to exclude destruction and crushing. However, for a more significant increase in the service life of parts, it is necessary to apply comprehensive measures that allow solving these problems together. The mechanism of impact-abrasive wear of materials is primarily determined by their chemical composition and structure. A study of the nature of wear of hardened iron-carbon rolled steels shows that with a change in carbon concentration, the mechanism of impact-abrasive wear also changes. With an increase in the carbon content, the hardness of the metal increases, the depth of the holes from the introduction of the abrasive gradually decreases, however, the wear changes according to a more complex relationship: it decreases with an increase in the carbon concentration to 0.7 + 0.8%, and with a higher content, it increases.