Influence of microstructure on mass loss caused by acoustic and hydrodynamic cavitation
arxiv(2024)
Abstract
The proposed study investigates the damage mechanisms of martensitic
stainless steel X3CrNiMo13-4 exposed to cavitation using two complementary
experimental apparatus: ultrasonic horn (MUCEF) and hydrodynamic tunnel
(PREVERO). Cavitation testing has been carried out on two different
metallurgical states: QT780 and QT900 corresponding to coarse and fine
microstructure respectively. Acoustic cavitation erosion tests have been
performed on the MUCEF equipment inspired from the ASTM G32 standards but
specially designed to be installed inside X-Ray tomographs. The ultrasonic horn
operates at 20 kHz and the tested specimen is located at 500 μm from the
horn tip. Hydrodynamic cavitation erosion tests were conducted with classic
experimental conditions of PREVERO device: a cavitation number of 0.87
corresponding to a flow velocity of 90 m.s-1 and an upstream pressure of 40
bars. For acoustic cavitation, mass loss has been identified as dependent of
the microstructure while for hydrodynamic cavitation the mass loss is identical
whatever the microstructure size.
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