Authors:
Josué Dávila (Bundesanstalt für Materialforschung und -prüfung, Germany)
Rafael Kleba-Ehrhardt (Technische Universität Berlin, Faculty III Process Sciences, Germany)
Gunther Mohr (Bundesanstalt für Materialforschung und -prüfung, Germany)
Kai Hilgenberg (Bundesanstalt für Materialforschung und -prüfung, Germany)
Abstract:
This study examines the impact of varying oxidation levels in nickel-based Haynes 282 powder on particle degradation during laser powder bed fusion (PBF-LB|M). Four powder batches with oxygen content levels of approximately from 140 ppm to1400 ppm were processed using PBF-LB|M. A powder collection container was fabricated to sample unmelted powder from heat-affected regions of the powder bed. Recoating and melting proceeded without issues; however, increased fume emissions were observed at higher oxidation levels, indicating intensified spatter formation. Post-process analysis revealed that finer particles exhibited greater surface oxidation due to their higher surface-to-volume ratio. Despite significant oxygen uptake, chemical analysis showed no measurable changes in key alloying elements in either the unmelted or spatter particles. Additionally, changes in particle size distribution became more pronounced at high oxidation levels. These findings provide a basis for understanding oxidation-driven degradation and optimizing powder reuse strategies to maintain material performance.
DOI:
https://doi.org/10.59499/EP256767986
