Abstract
The present paper presents the results of metallographical investigation and wear tests of tool steel grades: hot work steels 4H5W2FS, AMS 6437E and cold work steels ASTM A681, Ch12FS. All surfaces were hardened by the Carbo process (carburising) and by the NiCar process (nitrocarburising). The thermochemical treatment was conducted in powder pack for durations of 6 h (carburising) and of 4 h in the case of nitrocarburising. Wear tests were conducted by the three cylinder cone method. Wear velocity was 0·58 m s−1, unit loads were 50 and 400 MPa, wear path was 3470 m. Oil SAE30 was applied at the rate of 30 drops/min−1. Factors investigated were: morphology, depth and microhardness of the cases obtained, their microstructure, as well as phase composition.
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