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dc.contributor.authorTucho, Wakshum Mekonnen
dc.contributor.authorHansen, Vidar Folke
dc.date.accessioned2021-06-08T08:01:16Z
dc.date.available2021-06-08T08:01:16Z
dc.date.created2021-05-20T14:18:14Z
dc.date.issued2021-02
dc.identifier.citationTucho, W.M., Hansen, V.F. (2021) Studies of Post-Fabrication Heat Treatment of L-PBF-Inconel 718: Effects of Hold Time on Microstructure, Annealing Twins, and Hardness. Metals, 11 (2), 1-20.en_US
dc.identifier.issn2075-4701
dc.identifier.urihttps://hdl.handle.net/11250/2758434
dc.description.abstractThe widely adopted temperature for solid solution heat treatment (ST) for the conventionally fabricated Inconel 718 is 1100 °C for a hold time of 1 h or less. This ST scheme is, however, not enough to dissolve Laves and annihilate dislocations completely in samples fabricated with Laser metal powder bed fusion (L-PBF) additive manufacturing (AM)-Inconel 718. Despite this, the highest hardness obtained after aging for ST temperatures (970–1250 °C) is at 1100 °C/1 as we have ascertained in our previous studies. The unreleased residual stresses in the retained lattice defects potentially affect other properties of the material. Hence, this work aims to investigate if a longer hold time of ST at 1100 °C will lead to complete recrystallization while maintaining the hardness after aging or not. For this study, L-PBF-Inconel 718 samples were ST at 1100 °C at various hold times (1, 3, 6, 9, 16, or 24 h) and aged to study the effects on microstructure and hardness. In addition, a sample was directly aged to study the effects of bypassing ST. The samples (ST and aged) gain hardness by 43–49%. The high density of annealing twins evolved during 3 h of ST and only slightly varies for longer ST.en_US
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleStudies of Post-Fabrication Heat Treatment of L-PBF-Inconel 718: Effects of Hold Time on Microstructure, Annealing Twins, and Hardnessen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright: © 2021 by the authorsen_US
dc.subject.nsiVDP::Teknologi: 500en_US
dc.source.pagenumber1-20en_US
dc.source.volume11en_US
dc.source.journalMetalsen_US
dc.source.issue2en_US
dc.identifier.doi10.3390/met11020266
dc.identifier.cristin1911090
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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