Effect of Laser Power in Laser Powder Bed Fusion on Ni Content and Structure of Nitinol

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aut.relation.journalMaterials Today: Proceedings
dc.contributor.authorSequeda Leon, EM
dc.contributor.authorSingamneni, S
dc.contributor.authorGuraya, T
dc.contributor.authorChen, ZW
dc.date.accessioned2023-07-11T02:30:08Z
dc.date.available2023-07-11T02:30:08Z
dc.date.issued2023-06-10
dc.description.abstractLaser powder bed fusion (LPBF) additive manufacturing is capable of producing Nitinol stents of complex shapes, but a slight change of Ni content during LPBF can result in the stents not being suitable. Thus, there is a need to predict how laser power (P) and thus energy (E) affects the two important outcomes of Nitinol LPBF: defect level and Ni content. In this study, how Ni content may change during LPBF has been studied under two conditions: a sufficiently low P (thus E) but close to fully dense condition and a sufficiently high P that has caused keyhole pore formation. The loss of Ni has been found to be 0.36at% and 0.56at% for the sufficiently low and sufficiently high P conditions. Thus, 0.4–0.5at%Ni loss is expected for defect-free Nitinol LPBF. The morphological features of the melt pool affecting defect formation and relating to how P affects Ni loss will be discussed. With the significant loss of Ni due to LPBF, for the starting powder, which contains 50.5at%Ni and is fully austenitic, the LPBF as-built structure has remained mainly austenitic, but the samples also contain a small amount of martensite.
dc.identifier.citationMaterials Today: Proceedings, ISSN: 2214-7853 (Print), Elsevier BV. doi: 10.1016/j.matpr.2023.05.678
dc.identifier.doi10.1016/j.matpr.2023.05.678
dc.identifier.issn2214-7853
dc.identifier.urihttp://hdl.handle.net/10292/16416
dc.languageen
dc.publisherElsevier BV
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S2214785323033217
dc.rights.accessrightsOpenAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject4014 Manufacturing Engineering
dc.subject40 Engineering
dc.subject0306 Physical Chemistry (incl. Structural)
dc.subject0912 Materials Engineering
dc.subject0914 Resources Engineering and Extractive Metallurgy
dc.subject4016 Materials engineering
dc.titleEffect of Laser Power in Laser Powder Bed Fusion on Ni Content and Structure of Nitinol
dc.typeJournal Article
pubs.elements-id510820
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