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TECHNICAL PAPERS

Effect of Nozzle-Traveling Velocity on Oil Cavitation Jet Peening of Aluminum Alloy, AA 6063-T6

[+] Author and Article Information
A. Sahaya Grinspan

Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai — 600 036, India

R. Gnanamoorthy1

Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai — 600 036, Indiagmoorthy@iitm.ac.in

1

Corresponding author.

J. Eng. Mater. Technol 129(4), 609-613 (Jul 02, 2007) (5 pages) doi:10.1115/1.2772339 History: Received December 25, 2006; Revised July 02, 2007

A new surface modification process was developed to introduce compressive residual stresses at the surface of components. In this process, instead of oil droplets a high-velocity cavitation jet (cloud of oil bubbles) impinges on the surface of the component to be peened. The impact pressure generated during implosion of cavitation bubbles causes severe plastic deformation at the surface. Consequently, beneficial compressive stresses are developed at the surface. In order to find the potential of this process, aluminum alloy AA6063-T6 specimens were peened at a constant cavitation number with various nozzle-traveling velocities. Residual stress induced by oil jet cavitation peening was measured using X-ray diffraction. Oil cavitation jet peening results in a smooth and hard surface. The developed compressive residual stresses at the peened surface are about 52%, 42%, and 35% of yield strength in samples for peened at nozzle traveling velocities of 0.05mms, 0.10mms, and 0.15mms, respectively.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup of oil cavitation jet peening

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Figure 2

Basic principle of oil cavitation jet peening

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Figure 3

Photograph of oil cavitation jet at a cavitation numbers, σ of 0.0017

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Figure 4

Basic mechanism of introduction of compressive residual stress at the surface of workpiece: (a) during implosion of bubble near the surface and (b) after implosion of bubble

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Figure 5

Effect of nozzle-traveling velocity on residual stress in AA 6063-T6

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Figure 6

Effect of nozzle-traveling velocity on surface hardening in AA 6063-T6

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Figure 7

Micrographs showing the surface morphology of cavitation oil jet peened surfaces of AA 6063-T6: (a) unpeened; (b) peened, 0.05mm∕s; (c) peened, 0.10mm∕s; and (d) peened, 0.15mm∕s

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Figure 8

Micrographs showing the typical pits observed on the peened surfaces of AA 6063-T6: (a) peened, 0.05mm∕s; (b) peened, 0.10mm∕s; and (c) peened, 0.15mm∕s

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Figure 9

Variation of centerline average surface roughness and peak-to-valley surface roughness on AA 6063-T6 specimens before and after peening

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