Authors:
Marco Mitterlehner (voestalpine Böhler Edelstahl GmbH & Co KG, Austria),
Harald Gschiel (voestalpine Böhler Edelstahl GmbH & Co KG, Austria),
Michael Schatz (voestalpine Böhler Edelstahl GmbH & Co KG, Austria),
Helena Weingrill (Anton Paar GmbH, Austria),
Timothy Aschl (Anton Paar GmbH, Austria)
Abstract:
When it comes to the characterization and processing of metal powders used in laser beam powder bed fusion (LB-PBF) processes, moisture has been a recurring topic for quite some time. In general, a distinction must be made between water from the air surrounding the metal powder and water adsorbed on the metal powder surface. To investigate the actual influence of these two water sources, a gas atomized superalloy powder BÖHLER L718 AMPO was exposed to different humidity levels and examined under these conditions. Thus, the correlation between the prevailing air humidity and the adsorbed water content on the metal powder surface and further, the influence on well-known (flow time and apparent density) as well as modern (shear cell parameters such as the flowability coefficient) powder characteristics was investigated. The water content adsorbed on the metal powder surface was determined by Karl Fischer titration.
DOI:
https://doi.org/10.59499/WP225372079