Abstract:
WC-NiCr and WC-Hastelloy C coatings were deposited on Monel K-500 substrate by HVOF-spray with an aim to
enhance cavitation erosion resistance of the alloy. The cavitation tests were performed for 10 h following ASTM
G32-10 standard. Both WC-NiCr as well as WC-Hastelloy C coatings successfully reduced the erosion volume loss
of the alloy by 59% and 9% respectively. The relatively superior performance of WC-NiCr coating could be
attributed to better combination of its microhardness and fracture toughness. Formation of craters, cavities, and
debonding of splats were found to be the signatures of cavitation erosion in the coatings. Whereas, microplastic
tearing and microcracks were observed as the primary erosion mechanism in Monel K-500.
