Abstract
Co-based laser cladded coatings reinforced with in situ TiN-VC were prepared. The microstructure and high temperature tribological performance of the cladded coatings were researched. Results revealed that TiN and VC were identified in the cladded coatings with in situ TiN-VC besides γ-Co and Cr23C6 phases. In situ TiN and VC promoted the formation of many short rod-shaped dendritic crystals and equiaxed crystals, refining the microstructure. Compared with the Co-based cladded coatings, the microhardness of the cladded coatings with in situ TiN-VC at 20 °C was improved by 30.0%, the mass loss was reduced by 51.3%, and the friction coefficient was obviously decreased. The mass loss and friction coefficient of the cladded coatings with in situ TiN-VC were both initially increased and subsequently decreased as the temperature was increased from 20 to 600 °C and were up to 12.2 mg and 0.256 at 400 °C, respectively. The abrasion mechanism was translated from the abrasive wear to the abrasive wear, adhesive wear, and oxidation wear.
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