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Effect of Different Forms of Application of a Laser Surface Treatment on Fatigue Crack Growth of an AA6013-T4 Aluminum Alloy

  • C. M. Gonçalves
  • L. B. GodefroidEmail author
  • M. S. F. Lima
  • N. P. Sampaio
Article
  • 28 Downloads

Abstract

This work analyzes the effect of surface-localized laser heating treatment on the fatigue crack growth (FCG) rate on region II of the sigmoidal da/dN × ΔK curve of an aerospace-grade AA6013-T4 aluminum alloy sheet with 1.3 mm thickness. The influence on microstructure changes is also evaluated. Aiming to improve the FCG resistance without changing the mechanical behavior of the alloy, a Yb:fiber laser beam is defocused to generate a laser spot diameter of 2 mm, using 200 W power and a laser speed of 2 mm/s. Two laser lines are applied over fatigue C(T) specimens in two different forms: on only one and on both lateral specimen surfaces. Guinier–Preston zones, dispersoids and coarse constituent particles are found on the base material. On the heat-treated material, the same precipitates and also β′ and Q′ precipitates are found. These microstructural variations due to the laser thermal cycle, together with the presence of induced compressive residual stresses, improved the fatigue behavior of the material. The FCG retardation is optimized when two laser lines were applied on both lateral surfaces of the specimen.

Keywords

aluminum alloy fatigue crack growth laser surface treatment microstructure residual stresses 

Notes

Acknowledgments

The authors would like to acknowledge the Center of Microscopy at the Universidade Federal de Minas Gerais (Brazil) for providing the equipment and technical support for experiments involving transmission electron microscopy. C.M. Gonçalves would like to acknowledge CAPES for providing her financial support.

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Copyright information

© ASM International 2019

Authors and Affiliations

  • C. M. Gonçalves
    • 1
  • L. B. Godefroid
    • 1
    Email author
  • M. S. F. Lima
    • 1
    • 2
  • N. P. Sampaio
    • 3
  1. 1.REDEMATUniversidade Federal de Ouro PretoOuro PrêtoBrazil
  2. 2.Photonics DivisionInstitute for Advanced StudiesSão José dos CamposBrazil
  3. 3.CM-UFMGUniversidade Federal de Minas GeraisBelo HorizonteBrazil

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