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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Gautier Doumenc; David Gloaguen; Pascal Paillard; Bruno Courant; Patrice Peyre; Aude Simar; Damien Fabrègue; Frédéric Deschaux-Beaume; Laurent Couturier; Université de Nantes (1962-....).; École doctorale Sciences pour l'ingénieur (Nantes).; Institut des Matériaux Jean Rouxel (Nantes).; Institut de Recherche en Génie Civil et Mécanique (Nantes). |
OCLC Number: | 1273971358 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Gautier Doumenc ; sous la direction de David Gloaguen et de Pascal Paillard et de Bruno Courant. |
Abstract:
Additive manufacturing or 3D printing makes it possible to optimise the performance of a part, as well as its environmental impacts. Wire and Arc Additive Manufacturing (WAAM), due to its high deposition rate, offers the possibility to manufacture large components at a lower cost. Age hardened aluminium alloys such as AA6061 are widely used for structural applications because of their high specific properties. In age hardening alloys, microstructures and nanostructures are strongly influenced by the main process parameters and do have a critical influence on the mechanical performances of the built part. The recent development of a variant of the Metal Inert Gas (MIG) deposition process, based on a low-energy short-circuit transfer mode called Cold Metal Transfer® (CMT), enabled the use of poorly weldable alloys. This process was successfully applied to produce defect-free 6061 parts. The effect of the process parameters on the material health and weld bead geometry has been examined. With optimised parameters, achieved thin-walls have a low porosity ratio and no hot cracking. The resultant microstructures have been analysed and are reliant on the WAAM process parameters and the deposition strategy. Stacked structures consisting of successive alternating layers of columnar and equiaxial grains are observed. Precipitation state has also been studied. Nanometric phases investigations have shown that built parts can reach a standard precipitation state. Mechanical testing and residual stress analysis (by XRay and Neutron diffraction) have been performed showing standard mechanical properties and high tensile stresses in the built parts. This work is presented as a participation in the development of the WAAM concept and on a wider scale in 3D printing.
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