OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 the small thickness of the oxide fi lm (no more than 20 nm in accordance with [41–43]) and the insignifi cant amount of oxides, not exceeding 3 % of the sensitivity threshold of XRD method, do not allow to detect the oxides on the surface of TiNi by the XRD method. In the XRD patterns of steel (Fig. 7) before and after laser treatment, only phases identifi ed as austenite and ferrite in a ratio of 75:25 were recorded. Even with UV laser treatment for 600 s, phases belonging to oxides could not be detected in steel specimens by the XRD method, which may also be due to limitations of the XRD method. a b Fig. 6. XRD patterns of Ni-Ti alloy specimens in the initial state (a, 1) and after UV laser treatment for 60 s (a, 2), 120 s (a, 3), 300 s (a, 4) and 600 s (a, 5; b) Fig. 7. XRD patterns of stainless steel specimens before (a) and after UV laser treatment for 60 s (b), 420 s (c) and 600 s (d)
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