The surface of Nimonic 80A alloy was melted and rapidly solidified using TIG process (Tungsten Inert Gas) in order to produce a high-strength microstructure to improve cavitation erosion resistance. Cavitation tests, performed on an ultrasonic vibrator at a frequency of 20 kHz and at amplitude of 50 μm oscillations pointed out that these microstructure changes lead to significant differences in the behavior of this alloy to erosion generated by vibrator cavitation. Optical microscopy and scanning electron microscopy of the TIG melted sample surface and tested for cavitation erosion, showed a ductile behavior. At the same time, the finishing of the microstructure is showing a significant decrease of the maximum erosion penetration depth and of the erosion speed compared to the reference material.Keywords: Nimonic 80A alloy, TIG melted surface, structure, cavitation
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