Analysis of Residual Stresses in Laser-Shock-Peened and Shot-Peened Marine Steel Welds

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Abstract

Laser peening is now the preferred method of surface treatment in many applications. The magnitude and depth of the compressive residual stress induced by laser peening can be influenced strongly by the number of peen layers (the number of laser hits at each point) and by processing conditions including the use of a protective ablative layer. In this study, residual stresses have been characterized in laser and shot-peened marine butt welds with a particular focus at the fatigue crack initiation location at the weld toe. X-ray diffraction, synchrotron X-ray diffraction, incremental center-hole drilling, and the contour method were used for determination of residual stress. Results showed that the use of ablative tape increased the surface compressive stress, and the depth of compressive stress increased with an increase in number of peening layers. A key result is that variation of residual stress profile across laser peen spots was seen, and the residual stress magnitude varies between the center and edges of the spots.

Published Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s11661-016-3867-y
Original languageEnglish
Pages (from-to)759-770
Number of pages12
JournalMetallurgical and Materials Transactions A
Volume48
Issue number2
Early online date21 Nov 2016
DOIs
Publication statusPublished - Feb 2017

Bibliographical note

A read-only copy of the paper can be found here: http://rdcu.be/ot8u

Keywords

  • Residual stress
  • Laser peening
  • shot peening
  • contour method
  • synchrotron X-Ray diffraction

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