Abstract
Results of the study of a surface laser heat treatment influence on structure and properties of a CSN 41 9830 high speed steel are presented. A laser melted and transformation hardened material has been investigated. It has been determined that the material structure has a substantial influence on material characteristics after laser heat treatment. Quantitative and also partly qualitative changes of a steel phase composition occur owing to a non-equilibrium heating and cooling of material microvolume. These changes influence a material hardness after laser heat treatment so as in a condition after tempering to secondary hardness. The crack nucleation or other discontinuities didn't occur during laser affecting steel surface.

Key words
high speed steels, surface laser heat treatment, structure and properties, qualitative changes

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