Abstract
Abstract Incoloy alloy 865 is expected to be used as an erosion-resistant alloy in marine engineering. To study its cavitation erosion behaviour and mechanism in NaCl solution, ultrasonic vibration experiment was conducted by changing the ultrasonic cavitation duration, NaCl concentration, and vibration distance. ANSYS Fluent was used to simulate the dynamics of formation and collapse of cavitation bubbles under ultrasonic vibration. Surface roughness, volume loss, and wettability, microstructure and micromorphology of the deteriorated surface were evaluated. In this study, the cavitation erosion mechanism was discussed and the cavitation resistance of this alloy material was evaluated by determining the erosion rate. Results revealed that the erosion resistance of Incoloy alloy 865 in NaCl solution decreased with increase in the solution concentration. With the increase in cavitation duration, the formation process of the deteriorated surface included undulation deformation, pit and crack growth, and material peeling. The damage mechanism of Incoloy alloy 865 was the formation of pits and a fatigue process. The erosion behaviour was attributed to its corrosion resistance and microstructures. The wettability characteristics of the erosion surface were characterized. It is also a feasible way to obtain superhydrophobicity surface of Incoloy alloy 865 by cavitation erosion modification.
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