Abstract—
This article describes cavitation wear tests of cast titanium alloy using an ultrasonic magnetostriction vibrator in fresh and artificial sea water at oscillation amplitudes of a vibrator concentrator horn tip equal to 15 and 28 μm and oscillation frequency of about 22 kHz. In the course of tests the specimens were periodically weighed, then, the microhardness and surface roughness were measured. Two stages can be highlighted in the plots of microhardness as a function of cavitation: the stage of hardening, when the alloy microhardness increases, and the stage of softening, then the microhardness decreases. It was detected that the maximum microhardness in sea water decreases by about 10% in comparison with the tests in fresh water, which can be attributed to a decrease in dislocation density in a plastically deformed surface layer due to an increase in the portion of dislocations emerging on the surface. The impact of sea water leads to an increase in plasticity of surface layers upon cavitation by ultrasonic vibrator, which is manifested by an increase in ultimate plastic deformation of the surface estimated by an increase in the length of surface profile at the end of the incubation period. Herewith, the increase in the duration of incubation period and the decrease in cavitation wear in sea water were detected in comparison with the tests in fresh water. It was assumed that the detected changes in regularities of cavitation wear upon transfer from fresh to sea water are stipulated by the action of double electrical layer formed in sea water on the alloy surface.
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Notes
According to ASTM G32-10 Standard test method for cavitation erosion using vibratory apparatus.
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Translated by I. Moshkin
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Tsvetkov, Y.N., Fiaktistov, Y.O. & Kudryavzeva, Y.R. Comparative Analysis of Cavitation Wear of Titanium Alloy in Fresh and Sea Water. J. Frict. Wear 43, 20–26 (2022). https://doi.org/10.3103/S1068366622010123
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DOI: https://doi.org/10.3103/S1068366622010123