Effect of Applied Stress and Temperature on Residual Stresses Induced by Peening Surface Treatments in Alloy 600
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In this study, the effects of applied tensile stress and temperature on laser shock peening (LSP) and cavitation shotless peening (CSP)-induced compressive residual stresses were investigated using neutron and x-ray diffraction. Residual stresses on the surface, measured in situ, were lower than the applied stress in LSP- and CSP-treated Alloy 600 samples (2 mm thick). The residual stress averaged over the volume was similar to the applied stress. Compressive residual stresses on the surface and balancing tensile stresses in the interior relax differently due to hardening induced by LSP. Ex situ residual stress measurements, using XRD, show that residual stresses relaxed as the applied stress exceeded the yield strength of the LSP- and CSP-treated Alloy 600. Compressive residual stresses induced by CSP and LSP decreased by 15-25% in magnitude, respectively, on exposure to 250-450 °C for more than 500 h with 10-11% of relaxation occurring in the first few hours. Further, 80% of the compressive residual stresses induced by LSP and CSP treatments in Alloy 600 were retained even after long-term aging at 350 °C for 2400 h.
Keywordscavitation jet peening laser shock peening non-ferrous metals residual stress surface treatments x-ray
We acknowledge the support of the Center for Neutron Research, National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities used in this work. The authors are grateful for financial support of this research by the Nuclear Energy University Program (NEUP) of the US Department of Energy Contract #102835 issued under Prime Contract DE-AC07-05ID14517 to Battelle Energy Alliance, LLC. We also gratefully acknowledge the contribution of the State of Ohio, Department of Development and Third Frontier Commission, which provided funding in support of “Ohio Center for Laser Shock Processing for Advanced Materials and Devices” equipment in the Center that was used in this work. The authors would also like to thank Professor Hitoshi Soyama and Dr. Osamu Takakuwa at Tohoku University for the CSP-treating Alloy 600 samples. Any opinions, findings, conclusions, or recommendations expressed in these documents are those of the author(s) and do not necessarily reflect the views of the DOE or the State of Ohio, Department of Development.
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