Abstract
This paper deals with the possibilities of heat treatment of a pair of tool steels, produced by the powder metallurgy. The investigated steels named M390 and M398 belong to the group of high-alloy chromium steels used in the plastics industry in the production of screws for injection moulding machine unit. The steels were heat treated using quenching or quenching with deep freezing to achieve a homogeneous martensitic structure. Subsequently, the pair of steels was tempered twice in the temperature range from 200°C to 600°C. The given samples were experimentally tested for hardness and notch toughness using a Charpy hammer. The results compared the values of hardness and notch toughness depending on the tempering temperature. Selected fractures were observed using SEM microscopy.
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