Synchrotron XRD Evaluation of Residual Stresses Introduced by Laser Shock Peening for Steam Turbine Blade Applications
M. Newby, A. Steuwer, D. Glaser, C. Polese, D.G. Hattingh, C. Gornydownload PDF
Steam turbines used in the power generation industry are subject to fatigue during normal operation which includes transient events such as start-ups and steady state operation. Surface treatment methods, such as shot peening (SP) and roller burnishing, to induce surface compressive residual stresses in critical areas and improve fatigue life are commonly used, but the depth of the induced residual stresses is limited by the process. Laser shock peening (LSP) is a more recent development that has been applied in the aerospace industry on titanium blades, but is not yet commonly used in the power generation industry. The current research is focused on optimizing LSP parameters for the application of the process on 12Cr steels used for turbine blades. Evaluation of the induced residual stress was done with both conventional laboratory X-ray diffraction (XRD) and synchrotron X-ray diffraction (SXRD) techniques.
Laser Shock Peening, Residual Stress, Synchrotron, Diffraction
Published online 4/20/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: M. Newby, A. Steuwer, D. Glaser, C. Polese, D.G. Hattingh, C. Gorny, ‘Synchrotron XRD Evaluation of Residual Stresses Introduced by Laser Shock Peening for Steam Turbine Blade Applications’, Materials Research Proceedings, Vol. 4, pp 97-102, 2018
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