Mesoscopic characteristics, microstructure evolution, friction mechanisms, and corrosion behavior of Ni60-SiC_p coatings fabricated by laser-based directed energy deposition

The influence of varying SiC_p on the mesoscopic characteristics, microstructural evolution, microhardness, frictional mechanisms, and corrosion resistance behavior of laser-based directed energy deposition Ni60-SiC_p composite coatings was investigated. Coatings reinforced with varying SiC_p, the innovative concept of the ''Temperature-SiC_p joint effect'' mechanism was proposed. The microstructure was progressively refined due to the SiC_p, while microhardness was affected by the solid solution strengthening and diffusion strengthening effects of high SiC_p. Furthermore, based on wear scar morphologies, wear scar EDS analysis, and wear mechanism modeling, the frictional mechanisms were elucidated. Simultaneously, a clear understanding of the relationship between SiC_p and corrosion behavior were established. It is evident that the analysis of SiC_p reinforcement content in composite holds significant guiding significance.