Effect of refractory modifiers on the structure of coatings based on chromium carbide

Chromium carbide-based coatings with and without TiC and TiB2 modifiers were fabricated by non vacuum electron-beam cladding. Addition of the modifiers to the initial Cr3C2 powder mixture led to a change in the phase composition, microhardness and wear resistance of the composite coatings and the alpha -> gamma transformation of Fe. TiC and TiB2 particles formed the many crystallization centers in composite coatings, which led to a refinement of their microstructure. Larger TiC particles compared to the TiB2 particles were formed in the coatings as a result of melt crystallization. TiC modifier caused a decrease in the size of dendrites, while TiB2 led to a transition from a coarse dendritic structure to an equiaxed one. The coatings with TiC modifier demonstrated the maximum microhardness, and TiB2 coating had increased wear resistance. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Chromium carbide-based coatings were fabricated with and without TiC and TiB2 modifiers using non vacuum electron-beam cladding. The addition of modifiers altered the phase composition, microstructure, and properties of the composite coatings, enhancing their performance.