Effect of texture on the residual stress response from laser peening of an aluminium-lithium alloy

S. Zabeen, K. Langer, M. E. Fitzpatrick

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3 Citations (Scopus)
52 Downloads (Pure)

Abstract

Laser shock peening can improve the damage tolerance of metallic materials by introducing deep compressive residual stress that inhibits crack initiation and growth. This study investigates the laser peening of aluminium alloy in a product form – an extruded T-section – that has different crystallographic textures in different locations. The alloy studied is Al 2099, an aluminium-lithium alloy that shows anisotropy in the mechanical properties when texture is present. Specimens extracted from different regions of the extrusion were laser shock peened with a power density of 3 GW/cm2 in single shocks as well as in a pattern. Residual stresses were characterized primarily using incremental hole drilling. The results show 20% higher residual stresses in the web area of the extrusion compared to the flange after peening with a single laser shock, with this difference decreasing as the number of shocks increases. This effect can be explained by the difference in yield strength between those locations. No significant differences were observed in the residual stresses from peening onto different planes of a textured sample at a given location.

Original languageEnglish
Pages (from-to)317-329
Number of pages13
JournalJournal of Materials Processing Technology
Volume251
Early online date31 Jul 2017
DOIs
Publication statusPublished - 1 Jan 2018

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Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Materials Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Processing Technology, [251, (2017)] DOI: 10.1016/j.jmatprotec.2017.07.032

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Al 2099
  • Extrusion
  • Incremental hole drilling
  • Laser shock peening (LSP)
  • Residual stress
  • Texture

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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