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The wear resistance of the material and the wear mechanism are considered as the most important properties of tool materials. Changes in microstructures of tool materials may also results in the wear mechanism changes. Therefore, the aim of this study was to determine the relationship between microstructure and wear resistance of the hypereutectoid steel. Material used in investigations was 90CrV6 hypereutectoid steel. The material was heat treated on the basis of CCT diagram. After heat treatment the tribological tests were performed by the use of T-05 tribological test machine. Metallographic analysis of the microstructure and microanalysis of the wear surface for each samples after tribological test were performed. Analysis of the material microstructure and wear mechanism allowed define the relationship between the microstructure and wear resistance of the samples. For samples with pearlitic matrix the friction coefficient increased simultaneously with their hardness. Increase of the bainite volume fraction results in the decrease of average friction coefficient. The average friction coefficient changes were related with different wear mechanism for the bainitic microstructure. The wear area of samples with bainitic microstructure the microridging mechanism was observed. For the martensitic microstructure the wear was the biggest. The decrease of the wear resistance was probably related with the spalling of martensite.

Keywords: Sliding wear, wear mechanism, microstructure, phase transformation, tool materials

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