Réparation de pièces et développement de matériaux à gradients fonctionnels à l'aide de la déposition sous énergie dirigée
|Abstract:||Additive Manufacturing (AM) is a novel manufacturing process that allows the creation of complex shaped metallic parts from scratch in a layer-by-layer fashion conversely to conventional subtractive processes. This new technology is interesting for many manufacturing industries since it can enable significant cost savings and allows the creation of completely new and more efficient designs that were not achievable before. Directed Energy Deposition (DED) is a sub-category of AM processes that set itself apart from the others with its clever deposition process design.Using a high-density energy source such as an electron beam, a laser or a plasma arc, this process melts feedstock in powder or wire form onto a base plate the create a dense depositand a final part in an iterative way. Thanks to its deposition process, DED apparatuses can create Functionally Graded Materials (FGM) parts exhibiting varying mechanical or physical properties within their volume and repair defective or broken parts. These two main applications were the subject of three different studies that are presented in this master’s thesis. In the first one, complex shaped Ti-6Al-4V Metal Matric Composites (MMC) reinforced with different fraction of tungsten carbides (WC) created with a DED apparatus were studied in terms of mechanical behavior and wear properties.The next paper looked at tensile properties and microstructure of completely built and repaired 316L-Si stainless steel parts with DED. Finally, the last one studied the microstructure and the mechanical properties of entirely built and repaired AlSi7Mgparts using DED.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||18 October 2019|
|Collection:||Thèses et mémoires|
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