Abstract
The arc spraying process was used to prepare Fe-based amorphous/nanocrystalline coating. The cavitation erosion behaviors of FeNiCrBSiNbW coatings with different surface roughness levels were investigated in distilled water. The results showed that FeNiCrBSiNbW coating adhered well to the substrate, and was compact with porosity of less than 2%. With increasing initial surface roughness, the coatings showed an increase in mass loss of cavitation erosion damage. The amount of pre-existing defects on the initial surface of the coatings was found to be a significant factor for the difference in the cavitation erosion behavior. The cavitation erosion damage for the coatings was a brittle erosion mode. The evolution of the cavitation erosion mechanism of the coatings with the increase of the initial surface roughness was micro-cracks, pits, detachment of fragments, craters, cracks, pullout of the un-melted particle, and massive exfoliations.
Highlights
Cavitation erosion, often reported as a common phenomenon in the overflowing components of hydraulic machinery, is related to two main aspects of hydrodynamic and material [1,2]
We demonstrated that the cavitation erosion resistance of arc-sprayed Fe-based amorphous/nanocrystalline coating deteriorated with increasing annealing temperature [11]
The aim of this study was to discover the effect of initial surface roughness on cavitation erosion behavior of FeNiCrBSiNbW amorphous/nanocrystalline coating prepared by arc spraying process
Summary
Cavitation erosion, often reported as a common phenomenon in the overflowing components of hydraulic machinery, is related to two main aspects of hydrodynamic and material [1,2]. Surface roughness is capable of controlling cavitation erosion by affecting nuclei concentration, turbulence level and surface pressure distribution [4,5]. It is important to prepare a high performance coating to reduce or avoid cavitation erosion damage by selecting a suitable surface treatment technique, since cavitation erosion usually happens on a material surface of the flow-handling components such as hydraulic turbines, offshore/mining machineries, valves, and ship propellers [6,7,8].
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