The paper presents the results of investigations of coatings composed of chromium-nickel AISI 310S steel deposited by the magnetron sputtering method. Coatings were made for heat-resistance improvement of the steel: by the crystallites size reduction and by Al/Ir additions. During the deposition of coatings by the magnetron method, bcc structure may form in the coatings, despite the fact that the 310S steel is austenitic. During the present and other studies it has been found, that bcc phase is metastable and transform to fcc phase when the coating temperature increase.

Diffractometric measurements were made using CoKα radiation. the  in this work: In the temperature range t_room÷250°C the measurements were done in-situ using temperature attachment. At higher temperatures the measurements were done ex-situ, after 15 minutes of annealing of a sample at a given temperature. The temperatures were increased in steps of 50°C. It was found, that permanent effect of transformation occurred at 550°C but at lower temperatures the transformation is reversible, i.e. effect dissapear after cooling to room temperature.

The density of the coating was calculated taking into account the presence of the bcc metastable phase in the coating, which has a structure different from that of the substrate (fcc), . By using an asymmetric Bragg-Brentano diffraction geometry, the critical angles α was determined, at which radiation penetrates through the whole coating thickness. In the density calculations, the absorption coefficient, calculated from chemical composition of the coatings, and the coefficient G_x, determined experimentally, were used.

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