The influence of heat impact at 200 -1050°C on the structure, phase composition, microhardness and tribological characteristics due to sliding over a NiCrBSi fixed abrasive (corundum) is studied for a PG-10N-01 coating deposited by a gas-powder laser method. A combined laser-and-heat treatment is suggested, which yields a heat-resistant chromium-nickel coating containing a thermally stable high-strength wear-resistant skeleton of coarse carbides and chromium borides.

Abstract. The process parameters of the frictional treatment (indenter material, medium, load) of the 12Kh18N10T chromium-nickel austenitic steel have been optimized for the criteria of strain hardening and the quality of the surface being treated. The paper studies effect of the multiplicity of the frictional action of a synthetic diamond indenter at room temperature in an argon medium and the loading temperature ranging between -196 °C and +250 °C on the hardening, phase composition and fine structure of the surface layer of the steel. It has been found that the completeness of the strain-induced ´ martensitic transformation in the surface layer of the steel is strongly dependent on the multiplicity and temperature of loading and that the level of hardening rises with the multiplicity of action, but shows little dependence on the temperature of frictional treatment.

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