Electrical characterization of 316L metal powder used in additive manufacturing

dc.contributor.advisor Nicola Bowler
dc.contributor.author Filbert, Joseph
dc.contributor.department Electrical and Computer Engineering
dc.date 2020-09-23T19:12:44.000
dc.date.accessioned 2021-02-25T21:33:52Z
dc.date.available 2021-02-25T21:33:52Z
dc.date.copyright Sat Aug 01 00:00:00 UTC 2020
dc.date.embargo 2020-09-10
dc.date.issued 2020-01-01
dc.description.abstract <p>This research explores the feasibility of using the electrical properties of a metal powder to characterize the overall quality of the powder for use in powder bed fusion additive manufacturing. Feed powder which is recycled over multiple build cycles will no longer build quality parts; manufacturers and operators are interested in the ability to measure the powder degradation over time, to determine when the feed powder needs to be replaced or refreshed. The effects of reuse have been monitored using both chemical and mechanical characterization tests. The characterization tests investigate the particle size distribution (PSD), density, morphology, and surface chemistry of the feed powder. Additionally, strength and ductility of the built parts have also been assessed using mechanical testing, allowing correlation of the feed powder properties with the built part quality. Mechanical and chemical testing is expensive and time consuming. It is hypothesized that changes to the electrical properties of feed powder from reuse offers a pathway to in-line monitoring of feed powder quality. As a first step to developing an electromagnetic nondestructive evaluation method, broadband dielectric spectroscopy (BDS) measurements of wax-based metal powder composites were conducted. Seven different stainless-steel powder samples were prepared by altering their PSD, morphology and surface chemistry. It was shown that changes in PSD, morphology, and surface chemistry could be detected using BDS. These results will aid in the development of an in-line capacitive sensor for monitoring feed powder quality.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/18125/
dc.identifier.articleid 9132
dc.identifier.contextkey 19236671
dc.identifier.doi https://doi.org/10.31274/etd-20200902-44
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/18125
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/94277
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/18125/Filbert_iastate_0097M_19036.pdf|||Fri Jan 14 21:37:18 UTC 2022
dc.subject.keywords additive manufacturing
dc.subject.keywords nondestructive evaluation
dc.subject.keywords powder characterization
dc.title Electrical characterization of 316L metal powder used in additive manufacturing
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication a75a044c-d11e-44cd-af4f-dab1d83339ff
thesis.degree.discipline Electrical Engineering(Electromagnetics, Microwave,and Nondestructive Evaluation)
thesis.degree.level thesis
thesis.degree.name Master of Science
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