Abstract
WC–12Co coatings were deposited on 16Cr5Ni stainless steel substrate by high-velocity oxygen fuel (HVOF) process, followed by a one-hour heat-treatment in a tube furnace with a nitrogen atmosphere at 650, 800, 950, and 1100 °C, respectively. The influence of heat-treatment temperature on properties and cavitation erosion resistance of as-sprayed and heat-treated WC–12Co coatings was studied. The cavitation erosion test was carried out with ultrasonic cavitation erosion equipment. The porosity, microhardness, phase composition, as well as surface and cross-section morphology of the coatings were characterized. The coating heat-treated at 800 °C showed three typical cavitation erosion stages and exhibited the best cavitation erosion resistance. The cavitation erosion resistance was closely related to the coating microstructure and heat-treatment process. 3D optical microscopy was used to analyze the eroded surface of the coatings. The cavitation erosion mechanism of the coatings was discussed.
Highlights
Cavitation erosion (CE) is a recurrent phenomenon of bubble nucleation, growth, and collapse caused by the change of pressure, velocity, or temperature of the liquid [1,2,3]
Coatings prepared by high velocity oxy-fuel (HVOF) or atmospheric plasma spraying (APS) methods are customarily used to realize the surface strengthening of hydraulic mechanical materials
In the period of 30–180 min, it can be clearly distinguished that the cavitation erosion rates of HT 650 and HT 800 coatings were in an increasing stage, and this interval can be identified as the cavitation erosion acceleration period
Summary
Cavitation erosion (CE) is a recurrent phenomenon of bubble nucleation, growth, and collapse caused by the change of pressure, velocity, or temperature of the liquid [1,2,3]. Coatings prepared by high velocity oxy-fuel (HVOF) or atmospheric plasma spraying (APS) methods are customarily used to realize the surface strengthening of hydraulic mechanical materials. HVOF prepared nanostructured WC–12Co coating exhibits the excellent cavitation erosion resistance due to the dense microstructure, low porosity as well as high fracture toughness of the coating. According to Hong’s study [17], porosity played a dominant role in cavitation erosion resistance of near-nanostructured WC–10Co–4Cr coatings deposited by HVOF. Stewart et al [20] concluded that wear resistance of WC–17Co coating was obviously improved by heat-treatment. 50%(WC–12Co) + 50%(NiCr) coating presented better cavitation erosion resistance compared with as-sprayed coating. It can be seen that heat treatment can improve the wear and cavitation erosion resistance of WC–Co coatings. Cavitation erosion experiments of as-sprayed and heat-treated coatings were carried out by an ultrasonic cavitation erosion apparatus. 3D optical profile was used to quantitatively characterize the cavitation erosion performance of the coatings
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