Work is aimed at tool steel of 55NiCrMoV7 after four different heat treatment types. One part of material was after nitridation, other was quenched using laser, the third part was quenched by laser and subsequently nitrided and one part of steel 55NiCrMoV7 was in basic state after conventional quenching and tempering. Results of surface hardening using micro-hardness of all heat treated modes were compared mutually to find the most effective heat treatment. Micro-hardness was investigated from surface into the 2 mm depth of material. Micro-structure investigation completes the study and includes both purity evaluation and structure using light and SEM microscopy. The given steel type is suitable material for different applications, e.g. for cutting tools.Keywords: Steel 55NiCrMoV7, nitridation, laser quenching, micro-hardness, microstructure
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