About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Symposium
|
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
Effects of Induced Powder Bed Feedstock Particle Size Distribution Differences on Processability and Quality in PBF-LB/M |
Author(s) |
Nicolas A. Pielczyk, Jorge Mireles, Ryan B. Wicker |
On-Site Speaker (Planned) |
Nicolas A. Pielczyk |
Abstract Scope |
The impact of alternating particle size distribution (PSD) on melt pool characteristics and hardness in laser-based powder bed fusion of metals (PBF-LB/M) was investigated. Two PSD design cases (∆D50 = 18.3%) were prepared using custom-developed software, with blend repeatability statistically validated. A gravity-fed recoater, developed for the ACONITY MIDI+, enabled rapid single- and multilayer scan campaigns on 1”×1” substrates using <100 g of powder. Single-layer experiments with randomly assigned line energy density parameter sets revealed that the finer PSD improved process stability across the underlying process parameter window. Cross-section analysis showed more consistent melt pool depth-to-height ratios for the finer PSD. Multilayer samples processed at constant energy density and unidirectional hatching showed a significant 6.8% increase in Vickers hardness (HV0.1) for the finer PSD. These findings highlight the influence of PSD on stability and product properties, offering insights into designed powder blends and effects of spatial PSD differences in PBF-LB/M. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |