About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
Spatial Inhomogeneity of Build Defects Across the Build Plate in Laser Powder Bed Fusion |
Author(s) |
Terrence P. Moran, Derek Warner, Arash Soltani-Tehrani, Nam Phan, Nima Shamsaei |
On-Site Speaker (Planned) |
Terrence P. Moran |
Abstract Scope |
The population of build defects as a function of position on the build plate was examined in Ti-6Al-4V specimens fabricated on two common commercial laser powder bed fusion (LPBF) systems. Using standard build parameters, X-ray computed tomography revealed that spatial heterogeneity of the defect population can be substantial, relative to the variations in defect population that can occur due to other parameters, e.g. part geometry, build orientation, and laser power schedule. To understand the potential importance of such variability, its impact on fatigue performance is considered. Systemic asymmetries inherent to LPBF fabrication are investigated as potential sources of the spatial heterogeneity. Shielding gas flow simulations are shown to correlate well with the observed build quality heterogeneity. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |