Beyond Laser-by-Laser Additive Manufacturing - Voxel-Wise Directed Energy Deposition

dc.creatorNassar, A.R.
dc.creatorReutzel, E.W.
dc.date.accessioned2021-10-19T19:10:06Z
dc.date.available2021-10-19T19:10:06Z
dc.date.issued2015
dc.description.abstractConventional additive manufacturing is a layer-by-layer process, reliant on the sequential deposition of 2-1/2 D layers oriented along a build axis. During directed energy deposition a feedstock is directed into a continuous melt pool formed by a laser or electron beam. The ability to produce overhangs is limited due to the gravitational, surface tensions, and fluid-flow force acting on unsupported melt pools. Here, we present a novel, directed-energy-deposition technique where vertical and overhanging structures are formed by laser power modulation and the motion of a laser beam in three dimensional space along the build-up direction, rather than strictly in a single layer. We demonstrate that highly-overhanging Ti-6Al-4V structure, i.e. in which the overhang angle exceeds 45 degrees with respect to the x-y plane, can be deposited using the developed technique. High-speed imaging is used to gain insight into the physics of the process. The use of a pulsed or power-modulated beam is found to be critical to the formation of overhangs.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/89326
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2014 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectdirected energy depositionen_US
dc.subjectlayer-by-layer manufacturingen_US
dc.subjectadditive manufacturingen_US
dc.subjectoverhangsen_US
dc.subjectTi-6Al-4Ven_US
dc.titleBeyond Laser-by-Laser Additive Manufacturing - Voxel-Wise Directed Energy Depositionen_US
dc.typeConference paperen_US

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