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Process Monitoring of Directed-Energy Deposition of Inconel-718 via Plume Imaging

Nassar, A.R.; Starr, Brandon; Reutzel, E.W. (University of Texas at Austin, 2015)

Laser-metal interactions typically results in vaporization and plume formation. These phenomena are complex and depend upon the details of the laser-vapor-melt interactions. As such, plume characteristics are sensitive ...

Optical, Layerwise Monitoring of Powder Bed Fusion

Foster, B.K.; Reutzel, E.W.; Nassar, A.R.; Hall, B.T.; Brown, S.W.; Dickman, C.J. (University of Texas at Austin, 2015)

In powder bed fusion additive manufacturing, pre-placed layers of powder are successively fused to form three-dimensional components. During part build-up, flaws in the material or part geometry can occur and lead to an ...

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

Nassar, A.R.; Reutzel, E.W. (University of Texas at Austin, 2015)

Conventional 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 ...

System Identification and Feedback Control for Directed-Energy, Metal-Based Additive Manufacturing

Seltzer, D.M.; Wang, X.; Nassar, A.R.; Schiano, J.L.; Reutzel, E.W. (University of Texas at Austin, 2015)

Additive manufacturing of metal parts is a complex process where many variables determine part quality. In addition to manipulated process variables, such as travel speed, feedstock flow pattern, and energy distribution, ...