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Article
Effects of cold work on near-surface conductivity profiles in laser shock peened and shot peened nickel-base superalloy
Center for Nondestructive Evaluation Conference Papers, Posters and Presentations
  • Tyler J. Lesthaeghe, Iowa State University
  • Brian F. Larson, Iowa State University
  • Ramya Chandrasekar, Iowa State University
  • Anatoli M. Frishman, Iowa State University
  • Chester C.H. Lo, Iowa State University
  • Norio Nakagawa, Iowa State University
Document Type
Conference Proceeding
Conference
Review of Progress in Quantitative Nondestructive Evaluation
Publication Date
7-1-2012
Geolocation
(39.737567, -104.9847179)
Abstract

This paper reports on a study of the effects of cold work induced by surface enhancement treatment on conductivity profiles in nickel-base superalloys, as part of the on-going efforts aimed at evaluating the feasibility of characterizing near-surface residual stress profiles in peened engine components using a swept frequency eddy current (SFEC) technique. The approach is based on the empirical piezoresistivity effect that correlates conductivity changes with residual stress, but recent studies have shown that conductivity changes induced by peening processes are also influenced by metallurgical factors such as cold work. In this study, conductivity deviation profiles were obtained by model-based inversion of SFEC signals from a set of aged Inconel 718 samples, which were either shot peened or laser shock peened to produce different residual stress and cold work profiles. The laser shock peened samples exhibit a larger increase in surface conductivity and deeper conductivity profiles, which are attributed to a smaller amount of surface cold work and deeper residual stress profiles created by laser shock peening than by shot peening.

Comments

Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

This article appeared in AIP Conference Proceedings 1511 (2012): 1219–1226 and may be found at http://dx.doi.org/10.1063/1.4789182.

Copyright Owner
American Institute of Physics
Language
en
Citation Information
Tyler J. Lesthaeghe, Brian F. Larson, Ramya Chandrasekar, Anatoli M. Frishman, et al.. "Effects of cold work on near-surface conductivity profiles in laser shock peened and shot peened nickel-base superalloy" Denver, CO(2012)
Available at: http://works.bepress.com/tyler_lesthaeghe/1/