The paper presents studies of the structure of surface-alloyed layers obtained by the method of non-vacuum electron-beam cladding of the Ti-Cr-B4C and Cr-B4C powder mixture systems. Structural analysis allowed to identify the dependence of the initial powder portion on the shape and size of the phases formed. It is noted that the presence of titanium (10 wt. %) in the composition of the surfacing mixture leads to the formation of large primary crystals of titanium carbide and boride. The absence of titanium contributes to the formation of chromium carbide coating and small eutectic particles on the grain boundaries on the surface.