Abstract
1. In all the investigated steels saturation with boron leads to the formation of a heterophase structure characterized by dispersity of the structural components, chemical and structural inhomogeneity. In a thin surface layer of the treated zone metallography reveals molten boron particles which did not have time to react with the liquid metal. 2. In dependence on the marque of steel the boronized layers have different phase composition, and in addition to α- and γ-solid solutions they contain iron boride Fe2B and also complex boron carbides with different stoichiometric composition. Metastable crystalline phases were not discovered in the investigated specimens. 3. Laser boronizing increases microhardness because of the more complex phase composition as well as other changes of the structure connected with the high cooling rates of the alloyed layers.
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