OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Fig. 3. X-ray microanalysis results after DALMMS: 40Cr (a); 40Cr13 (b); St3 (c); 30CrMnSiNi2 (d) a b c d a sharp decrease in chromium concentration is observed during the transition from the surface layer to the layer enriched with nickel. Thus, at a depth of 5 µm for steel 40Cr the chromium concentration decreases from 80 % to 15 %, for steel 30CrMnSiNi2 it decreases from 78 % to 10 %. For steel 30CrMnSiNi2, the depth at which the chromium content corresponds to the base concentration is 10 µm. For steel 40Cr, the chromium diffusion depth was 15 µm. At the same time, in the surface layer of coatings on these steels the nickel content was quite low: 1.5 % for steel 30CrMnSiNi2 and 0.5 % for steel 40Cr. The maximum concentration of nickel was detected at a distance of 5 μm from the surface and amounted to 21 % for steel 30CrMnSiNi2 and 13 % for steel 40Cr. In coatings formed on steels St3 and 40Cr13, the chromium content was significantly lower. Thus, on steel St3 the chromium content was 15 %, on steel 40Cr13 it was 9 %. At the same time, the change in chromium concentration occurred more smoothly than on steels 40Cr and 30CrMnSiNi2. Also, a higher nickel content was revealed in the coatings on steels St3 and 40Cr13. Thus, on steels St3 and 40Cr13, the
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