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RESEARCH PAPERS

Assessment of Tensile Residual Stress Mitigation in Alloy 22 Welds Due to Laser Peening

[+] Author and Article Information
Adrian T. DeWald

Department of Mechanical and Aeronautical Engineering, University of California, One Shields Avenue, Davis, CA 95616Laser Science and Technology, Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94550

Jon E. Rankin

Laser Science and Technology, Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94550

Michael R. Hill, Matthew J. Lee

Department of Mechanical and Aeronautical Engineering, University of California, One Shields Avenue, Davis, CA 95616

Hao-Lin Chen

Laser Science and Technology, Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94550

J. Eng. Mater. Technol 126(4), 465-473 (Nov 09, 2004) (9 pages) doi:10.1115/1.1789957 History: Received July 21, 2003; Revised February 26, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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References

Figures

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Description of laser-peening process: (a) workpiece is covered with a protective ablative layer and an inertial confinement layer, a pulsed, high-energy laser is fired at the part, and (b) a region of high-pressure plasma is generated, which causes a shock wave to travel through the material.
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Geometry of 33 mm thick butt-weld specimen (laser-peened area shaded)
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Contour method principle: (a) a body containing unknown residual stress is cut in half, (b) the free surface deforms as the stresses normal to the plane of the cut are released, and (c) applying the opposite of the deformations back to the part recovers the initial residual stress state.
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Finite element model of half of the sample weld specimen
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Experimentally measured strain data and strain fit for specimen 10-02
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Residual stress versus depth for laser peening parameter study: (a) effect of number of layers on residual stress state and (b) effect of irradiance on residual stress state
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Sample of a measured surface line trace from each half of the cut (as-welded specimen) with fits to each surface shown along with the average of both fits: (a) line trace along x=102 mm and (b) line trace along y=16.25 mm
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Final CMM surface (after fitting, and averaging) interpolated at finite element node locations and inverted (for clarity): (a) as-welded weld and (b) laser-peened weld (laser peening applied along y-min surface from x=50 to x=150)
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Contour plot of residual stress distribution across the plane of the sample weld: (a) before laser peening treatment and (b) after laser-peening treatment on bottom surface
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Line plots of residual stress and distribution before and after laser-peening treatment: (a) center of weld bead, (b) weld bead toe (9 mm from center), and (c) outside of weld (30 mm from center)
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Contour plot of the change in residual stress caused by laser peening [peened minus as-welded residual stress from Fig. 9(a) through Fig. 9(c)]
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Effect of number of peening layers on residual stress in 13.5 mm thick Alloy 22 specimens measured using x-ray diffraction with layer removal

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