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Research Papers: Friction & Wear

Investigation Into Cavitation Erosion Pits

[+] Author and Article Information
A. Abouel-Kasem1

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

A. Ezz El-Deen

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

K. M. Emara

Department of Mechanical Engineering, Assiut University, Assiut 71516, Egyptemara@aun.edu.eg

S. M. Ahmed

Department of Mechanical Engineering, Assiut University, Assiut 71516, Egyptshemy2007@yahoo.com

1

Corresponding author.

J. Tribol 131(3), 031605 (Jun 10, 2009) (7 pages) doi:10.1115/1.3075863 History: Received July 30, 2008; Revised December 28, 2008; Published June 10, 2009

Cavitation erosion pits and their effects on erosion progression were investigated in detail for SUS 304 stainless steel, α+β brass (60/40), and pure aluminum (Al-99.999 and Al-99.92) by means of vibratory erosion. Two kinds of erosion pits were found on the specimen surfaces, one by microjet impact and the other by shockwave blow. Systematic observations of the feature of microjet-pits with the testing time showed that the sizes and shapes of microjet-pits did not change at all and such pits scarcely played an important role in developing the erosion. Moreover, the feature morphology of eroded surfaces, and dislodged particles and their large sizes revealed that microjet-pits had a limited effect on erosion and that the predominant failure was a fatigue process.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 3

Shockwave-pits formed on brass

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Figure 4

Shockwave-pits formed on aluminum of purities (a) 99.999 and (b) 99.92

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Figure 5

Photograph illustrates the cavitation bubbles: bubble cloud at center, shock rings at periphery labeled S, and tours bubbles (e.g., labeled m)

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Figure 6

Enlarged photograph of actual streaming patterns generated at 2 kHz (25)

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Figure 7

Microjet-pits’ formation on test piece No. 1 for various t: (a) 0 min, (b) 5 min, (c) 15 min, (d) 25 min, (e) 35 min, and (f) 45 min

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Figure 8

Pit formation on test piece No. 2 for various t: (a) 0 min, (b) 5 min, (c) 10 min, (d) 20 min, (e) 30 min, and (f) 40 min

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Figure 9

High magnification of pit chain on the upper right part of Fig. 5

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Figure 10

Micrographs of erosion particles for SUS 304 (a) and (b) and aluminum (c)

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Figure 11

Propagation of fatigue fracture along the tip of the slip band

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Figure 1

(a) Schematic view of the test apparatus and (b) horn’s disk

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Figure 2

Microjet-pits formed on the eroded surface of (a) SUS 304 and (b) brass

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