OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Conclusions 1. It is found that the total thickness of nickel and chromium diffusion coatings applied to structural steels reaches 15 µm. 2. Conducting DALMMS on carbon and low-alloy steels leads to the formation of two-layer coatings: a surface carbide layer and a transition solid-soluble one. At the same time, the chromium content in the surface layers reaches 80 % with a nickel content of 1.5 %. The maximum concentration of nickel is observed in the transition layer and amounted to 21 % at a depth of 5 µm on steel 30CrMnSiNi2 and 13 % at a depth of 4.5 µm on steel 40Cr. 3. Conducting DALMMS on steels with carbide-forming elements or low carbon content leads to the formation of single-layer coatings based on solid solutions. At the same time, the nickel content in the coating reaches 40 %, the chromium content for steel St3 is 14.5 %, and for steel 40Cr13 it is equal to 9 %. b Fig. 4. EDS of diffusion coatings on steels: 40Cr (a); St3 (b) a
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