About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
On the Utility of Using Volumetric Energy Density for Microstructure and Defect Predictions in Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Charles Thomas Smith, Elias Roll, Olivia DeNonno, Matthew Schreiber, Anthony Petrella, Craig Brice, Joy Gockel, Amy Clarke, Jonah Klemm-Toole |
On-Site Speaker (Planned) |
Charles Thomas Smith |
Abstract Scope |
Volumetric energy density is often used to guide parameter selection for laser powder bed fusion (LPBF) additive manufacturing. Within common values of hatch spacing and powder layer height, volumetric energy density can use useful to select laser power and travel speed that minimize lack of fusion and keyhole porosity. However, with the same volumetric energy density, it is possible to experience vastly different mesoscale defects and considerably different microstructural scales. In this presentation, we show that volumetric energy density has very little predictive capability when different hatch spacings and powder layer heights are evaluated. Different parameter sets of 316L LPBF were printed with the same energy density, and we show how total porosity, porosity type (keyhole vs lack of fusion), dendrite spacing, and grain size all significantly vary. Alternate concepts to both guide selection and accurately report process LPBF process parameters will be discussed. |