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Article Dans Une Revue Journal of Materials Processing Technology Année : 2023

Microstructure formation in 6061 aluminum alloy during nano-second pulsed laser processing

Résumé

Pulsed lasers are very promising branch of the laser material processing in terms of high productivity and quality of the resulting welds. However, laser welding of Al-based alloys is challenging due to their solidification hot cracking susceptibility. In this paper, AA6061 alloy, one of the widely used engineering materials, was processed with a nanosecond pulsed welding in the keyhole mode. The influence of process parameters, such as the laser power and the pulse duration, on the weld seam microstructure and geometrical characteristics was investigated. It was found that this welding allows to produce crack-free welds for all tested processing conditions. Unexpectedly, the lack of visible dendritic structure as well as heat affected zone (HAZ) in the weld pool were observed. These phenomena were explained by extremely high temperature gradients determined from the geometrical analysis of the weld pools, and were confirmed by solidification microstructure modeling.
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Dates et versions

hal-04213241 , version 1 (21-09-2023)

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D. Zhemchuzhnikova, Julien Zollinger. Microstructure formation in 6061 aluminum alloy during nano-second pulsed laser processing. Journal of Materials Processing Technology, 2023, 314, pp.117898. ⟨10.1016/j.jmatprotec.2023.117898⟩. ⟨hal-04213241⟩
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