Effect of different forms of application of a laser surface treatment on fatigue crack growth of an AA6013-T4 aluminum alloy.
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2019
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Resumo
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 3 DK 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 b¢ 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.
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Microstructure, Residual stresses
Citação
GONÇALVES, C. M. et al. Effect of different forms of application of a laser surface treatment on fatigue crack growth of an AA6013-T4 aluminum alloy. Journal of Materials Engineering and Performance, v. 28, p. 5832-5842, 2019. Disponível em: <https://link.springer.com/article/10.1007/s11665-019-04295-6>. Acesso em: 10 mar. 2020.