Technical Briefs

Thermal Effect at the Incipient Stage of Cavitation Erosion on a Stainless Steel in Ultrasonic Vibration Cavitation

[+] Author and Article Information
Chen Haosheng

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, Chinachenhs@mail.tsinghua.edu.cn

Li Jiang

Mechanical Engineering School, University of Science and Technology Beijing, Beijing 100083, China

Liu Shihan

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

J. Fluids Eng 131(2), 024501 (Jan 09, 2009) (3 pages) doi:10.1115/1.3054282 History: Received June 12, 2007; Revised May 03, 2008; Published January 09, 2009

An ultrasonic vibration cavitation erosion experiment was performed to study the thermal effect during the erosion process. The ring affected zone was observed on the sample surface around the erosion pit at the incipient stage of the cavitation erosion. The results of the surface testing on roughness, hardness, and chemical composition proved that the zone was caused by thermal effect, and that the zone surface experienced a tempering process with the temperature higher than 300°C. Numerical simulation results show that the high temperature domain in the bubble directly contacting the solid wall is a necessary condition for the occurrence of the tempering process on the zone surface, or the heat in the bubble can hardly be transferred to the solid wall under the effects of the great temperature gradient in the bubble and the quick cooling process in the water.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

(a) Vibration cavitation system, (b) the picture of the sample, (c) surface profile of the sample surface, and (d) experimental phenomenon

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Figure 2

(a) Pits scattered on the surface and (b) surface profile of the erosion pit tested by confocal laser scanning microscope; the uncertainty of the measured data is 0.01 μm according to the precision of the microscope

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Figure 3

Surface hardness testing; (a) is the pit with indents, and (b) is the hardness in and outside the ring affected zone

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Figure 4

The elemental composition of surface materials tested by EPMA-1600 electronic probe: (a) is the area scan result of carbon; (b) is the line scan results of Fe, C, and O; and (c) is the line scan results of Cr, Ti, and Ni



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