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Moisture in Metal Powder and Its Implication for Processability in L-PBF and Elsewhere
Swerim AB. (Powder Metallurgy)
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
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2020 (English)In: Berg- und Huttenmännische Monatshefte (BHM), ISSN 0005-8912, E-ISSN 1613-7531, Vol. 166, no 1, p. 33-39Article in journal (Refereed) Published
Abstract [en]

The impact of moisture on flowability and spread- ability is discussed. More notably we also present research on the impact of moisture on built nickel-base material. One lot of a newly opened Hastelloy X (HX) L-PBF powder was split into two equal batches. One batch was moisturized using a programmable climate chamber, the other was un- treated. We built bars with both batches for mechanical testing, in an EOS M100, with a cold build plate. The mois- ture content of the two powder batches, before and after the build-jobs, were determined using Karl Fischer titration (KF). Regarding the periodical monitoring of moisture con- tent, it is not needed according to the findings of this paper. More moisture contributes to a slightly higher O-content in the built material, and in turn, a very slight reduction in im- pact toughness. If a newly purchased powder exhibits poor flowability or high oxygen content, the analysis using oven- desorption followed by KF is recommended. If the moisture content is high, a drying of the powder is recommended

Place, publisher, year, edition, pages
2020. Vol. 166, no 1, p. 33-39
Keywords [en]
Moisture, Metal powder, Laser powder bed fusion, Spreadability, Flowability
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-301153OAI: oai:DiVA.org:kth-301153DiVA, id: diva2:1591076
Note

QC 20210916

Available from: 2021-09-05 Created: 2021-09-05 Last updated: 2022-06-25Bibliographically approved

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Marchetti, LorenzoHulme-Smith, Christopher

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CiteExportLink to record
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Citation style
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