Abstract
The microstructure, phase composition, microhardness and micromechanical properties of the laser clad Co-31.8Ni-22.6Cr-4.1W coating, as well as its contact endurance under contact-fatigue loading according to the scheme of the pulsing non-impact “sphere-to-surface” contact, have been studied. It has been found that the phase composition of the coating is γ + CoB + Cr23C6 + Cr(B,C), with the size of the strengthening phases (chromium carbides and carboborides) ranging between 1 and 10 µm. The average microhardness of the coating surface is 810 HV0.1. The process of fatigue degradation of the coating is characterized by a pronounced periodicity, with alternating periods of increasing size of contact damages and periods when it remains unchanged. Using the microindentation data, the ability of the Co-31.8Ni-22.6Cr-4.1W coating to resist mechanical contact action has been estimated and compared with two laser clad NiCrBSi coatings. It has been shown that the microindentation method (single loading) can be used for estimating and comparing the ability of laser clad coatings from alloys of different systems to withstand repeated contact loads if the coatings have identical size of the strengthening phases.
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