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Powder Rheology within AM production: Evaluating Compressibility, Permability, & Aeration for 316L Powders Within SLM Processes
University of Borås, Faculty of Textiles, Engineering and Business.
2022 (English)Independent thesis Basic level (university diploma), 180 HE creditsStudent thesisAlternative title
Pulver Reologi Inom AM Production : Utvärdering av Kompressibilitet, Permeabilitet, och Luftning för 316L pulver inom SLM processer (Swedish)
Abstract [en]

Additive manufacturing with the use of metals have been a steadily increasing field, being able to create products with a higher degree of complexity than traditional processing techniques. SLM is a popular AM process that uses metal powder as feedstock, and one of the key components of this process is the powder rheology. In recent years the use of a powder rheometer has been shown to be a good way of evaluating powder rheology of metal powders used within AM processes, but there is a clear lack of standardised tests and methods. In this study the Compressibility, Permeability, and Aeration test for 316L powders used within SLM processes was evaluated with a FT4 powder rheometer. 15 powders that had undergone printing in SLM processes were studied. This showed that the compressibility test had the best results in differentiating the bad preforming powders, thereafter the Aeration test. The Permeability test wasn’t able to differentiate the bad preforming powders with the settings used. This study demonstrates that some tests with a powder rheometer can evaluate the powder performance in SLM processes, but further research to evaluate the tests and standardise the settings are needed for clearer test results.

Abstract [sv]

Additiv tillverkning med metall är ett område som stadigt ökat i intresse, främst på grund av möjligheten att producera produkter med en mycket högre grad av komplexitet i jämförelse med traditionella processmetoder. SLM är en populär AM process som använder metallpulver som råmaterial, och en av huvudkomponenterna för processen är pulvrets reologi. Under senare år har användningen av en pulver-reometer visat sig ett bra sätt att utvärdera pulver-reologi för metallpulver som används inom AM, men det finns en klar avsaknad av standardiserade test och metoder. I denna studie utvärderas Kompressabilitet, Permeabilitet, och Aerabilitet testen för 316L pulver producerade för SLM processer med en FT4 pulver-reometer. 15 pulver som genomgått SLM printing studerades. Studien visar att kompressabilitets testets utfall bäst överensstämde med det som setts under SLM processen, och bäst urskilde pulvren som fungerat dåligt att printa med, därefter Aerations testet. Permeabilitets testet kunde inte urskilja de sämre pulvren med de inställningarna som användes. Studien demonstrerar att vissa test och index samlade med ett pulver reometer är mer tillförlitliga än andra när det gäller för att utvärdera pulvrets prestanda inom SLM processer, men vidare forskning och studier krävs för att utvärdera testen och standardisera inställningar baserat på pulvret som testas.

Place, publisher, year, edition, pages
2022.
Keywords [en]
Powder rheology, AM, Additive manufacturing, BPF, Powder bed fusion, SLM, Selective laser melting, FT4 powder rheometer, Compressibility, Permeability, Aeration
Keywords [sv]
Pulver reologi, AM, Additiv tillverkning, BPF, Pulver bed fusion, SLM, Selektiv lasersmältning, FT4 pulver reometer, kompressibilitet, permeabilitet, luftning
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-28395OAI: oai:DiVA.org:hb-28395DiVA, id: diva2:1688105
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Available from: 2022-08-17 Created: 2022-08-17 Last updated: 2022-08-17Bibliographically approved

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CiteExportLink to record
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