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Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles

1
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Max-Planck-Straße 1, 21502 Geesthacht, Germany
2
Leuphana University of Lüneburg, Institute of Product and Process Innovation, Universitätsallee 1, 21335 Lüneburg, Germany
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 655; https://doi.org/10.3390/met9060655
Received: 9 April 2019 / Revised: 29 May 2019 / Accepted: 30 May 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Laser Shock Processing and Related Phenomena)
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Abstract

Laser Peening (LP) is a surface modification technology that can induce high residual stresses in a metallic material. The relation between LP process parameters, in particular laser sequences, as well as pulse parameters and the resulting residual stress state was investigated in this study. The residual stress measurements, performed with the hole drilling technique, showed a non-equibiaxial stress profile in laser peened AA2024-T3 samples with a clad layer for certain parameter combinations. Shot overlap and applied energy density were found to be crucial parameters for the characteristic of the observed non-equibiaxial residual stress profile. Furthermore, the investigation showed the importance of the advancing direction, as the advancing direction influences the direction of the higher compressive residual stress component. The direction of higher residual stresses was parallel or orthogonal to the rolling direction of the material. The effect was correlated to the microstructural observation obtained via electron backscattered diffraction. Additionally, for peening with two sequences of different advancing directions, the study showed that the order of applied advancing directions was important for the non-equibiaxiality of the resulting residual stress profile. View Full-Text
Keywords: laser peening; laser shock peening; residual stresses; shot pattern; energy density; overlap; hole drilling; AA 2024; cladded aluminum laser peening; laser shock peening; residual stresses; shot pattern; energy density; overlap; hole drilling; AA 2024; cladded aluminum
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Kallien, Z.; Keller, S.; Ventzke, V.; Kashaev, N.; Klusemann, B. Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles. Metals 2019, 9, 655.

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