Vers des structures hautes performances en alliages d'aluminium 7xxx obtenues par fabrication additive : Wire Arc Additive Manufacturing et Additive Friction Stir Deposition

Details

Supervisors

Simar, Aude

Faculty

Ecole polytechnique de Louvain

Degree label

Master [120] : ingénieur civil en chimie et science des matériaux, à finalité spécialisée

Abstract

enThe aim of this thesis is to compare Wire Arc Additive Manufacturing (WAAM), a liquid-state additive manufacturing technology, with Additive Friction Stir Deposition (AFSD), a solid-state technique, for the manufacture of 7xxx series aluminum alloys. Alloy 7075 was used as a feed material, supplied in the form of a metal bar in AFSD, and in the form of plates subjected to TIG welding passes to approach WAAM. WAAM is a technology with which the scientific and industrial world is already familiar, while AFSD is relatively new and has not yet been the focus of much research, especially in its application to high-strength alloys such as 7xxx aluminum. Their principles, advantages and limitations will be presented in this first section. Macroscopic, microscopic and mechanical analyses are then carried out and explained in the second part of the paper. A TIG (Tungsten Arc Welding) process on sheet metal was applied as an alternative to the analysis of WAAM samples, and multi-layer walls were fabricated by AFSD. The results obtained highlight the differences in granular structure and mechanical behavior between the two technologies. In the case of TIG, the microstructure was shown to be highly dependent on the manufacturing process. The AFSD process, on the other hand, confirms its ability to refine the material's microstructure.