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Research Papers

An Evaluation of Abrasive Waterjet Peening With Elastic Prestress

[+] Author and Article Information
B. Sadasivam, A. Hizal, S. Park

Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21250

D. Arola1

Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21250; Department of Endodontics, Prosthodontics and Operative Dentistry, Baltimore College of Dental Surgery, University of Maryland, Baltimore, Baltimore, MD 21201darola@umbc.edu

1

Corresponding author.

J. Manuf. Sci. Eng 131(1), 011010 (Jan 15, 2009) (8 pages) doi:10.1115/1.3063656 History: Received May 10, 2008; Revised November 17, 2008; Published January 15, 2009

Abrasive waterjet peening (AWJP) has been conceived as a new surface treatment process capable of achieving desired changes in surface texture, chemistry, and residual stress simultaneously. In the present investigation, the influence of elastic prestress on the residual stress resulting from AWJP was studied. Treatments were conducted on steel, as well as nickel and titanium alloy targets subjected to an elastic prestress ranging from 0% to 75% of the material’s yield strength. The results showed that a tensile elastic prestress increases the surface residual stress and the depth of the compressive stress zone. The surface residual stress in each metal increased nonuniformly with magnitude of prestress; the maximum surface residual stress was obtained at an applied prestress between 45% and 60% of the substrate yield strength. Overall, the increases in surface stress and depth that were obtained reached 100% and 50%, respectively. There were no changes to the surface texture caused by the prestress. According to results of this study, application of an elastic prestress can serve as an effective method for improving characteristics of the residual stress field in components treated using AWJP.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of treatment parameters and apparatus for application of prestress. (a) Process parameters for treatment, (b) treatment path, (c) prestress fixture, and (d) prestress loading arrangement (L=89 mm M=83 mm)

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Figure 2

Schematic of the layer removal method. The variables t, z0, and z1 represent the thickness of material removed, the initial surface, and the final surface. The hatched region represents the layer to be removed by etching.

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Figure 3

Subsurface distribution in curvature and residual stress of a representative Ti6Al4V specimen treated under an elastic prestress of 75%. (a) Curvature distribution; (b) residual stress distribution.

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Figure 4

Effect of prestress on the subsurface residual stress distribution. (a) Variation in surface residual stress; (b) variation in residual stress depth.

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Figure 5

Effect of prestress on stored energy

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Figure 6

Effect of prestress on surface roughness

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Figure 7

SEM micrographs of specimen surfaces resulting from AWJP. Treatments were conducted while subjecting the specimen to a 75% prestress. (a) Inconel, (b) spring steel, and (c) Ti6Al4V

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Figure 8

Variation in hardness with depth resulting from AWJP. Treatments were conducted while subjecting the specimen to a 75% prestress.

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