Research Papers: Friction & Wear

Cavitation Erosion Mechanism Based on Analysis of Erosion Particles

[+] Author and Article Information
A. Abouel-Kasem

Department of Mechanical Engineering, Assiut University, Assiut 71516, Egyptabouelkasem@yahoo.com

S. M. Ahmed

Department of Mechanical Engineering, Assiut University, Assiut 71516, Egyptshemy2001@yahoo.com

J. Tribol 130(3), 031601 (Jun 23, 2008) (6 pages) doi:10.1115/1.2913552 History: Received May 22, 2007; Revised March 19, 2008; Published June 23, 2008

The mechanism of cavitation erosion is investigated in detail through observations of the removed particles from pure aluminum (Al-99.999). The particles removed during the incubation stage have distinctive characteristics compared to those removed in the subsequent stages. These characteristics are distinguished by lamellae structure, foldness, waviness, large size as well as one of the particle surfaces appeared to be part of the original face of the specimen. Therefore, these characteristics can be used as a monitor for early detection of cavitation erosion in closed systems. Systematic observations of disloged particles and eroded surface morphology show that the dominant failure mode in cavitation erosion is fatigue.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Schematic view of test apparatus

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Figure 2

MDPR versus time: (i) incubation stage, (ii) acceleration stage, (iii) steady-state stage (iv) attenuation stage; 1–5 particle collective timings

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Figure 3

Micrographs of erosion particles during incubation stage (the arrows show the original face of the specimen)

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Figure 4

High magnification for the surface of particles (a) and (d) in Fig. 3 showing the crack propagation

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Figure 5

Micrographs of erosion particles removed during acceleration stage

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Figure 6

Pair of particles observed during the second stage, the surface of particle on the left appeared to be part of the original face

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Figure 7

High magnification for the right particle in Fig. 6

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Figure 8

Micrograph of particles removed during the steady-state stage

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Figure 9

High magnification for particles in the third stage showing fatigue striations on the particle surfaces

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Figure 10

Micrographs of particles during the attenuation stage at two Intervals 4 and 5 shown in Fig. 2

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Figure 11

High magnification of particles removed in the fourth stage illustrating the fatiguelike striations

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Figure 13

The eroded surface and undetached particles

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Figure 14

Micrograph of the eroded surface showing the forming of particles and the fatigue fracture development

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Figure 12

Undetached particle and progress of crack forming fatigue striations



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