Improved plasticity of Inconel 718 superalloy fabricated by selective laser melting through a novel heat treatment process

dc.contributor.author Li, X.
dc.contributor.author Shi, J. J.
dc.contributor.author Russell, Alan
dc.contributor.author Cao, G. H.
dc.contributor.author Russell, Alan
dc.contributor.author Zhou, Z. J.
dc.contributor.author Li, C. P.
dc.contributor.author Chen, G. F.
dc.contributor.department Materials Science and Engineering
dc.date 2020-01-06T20:31:09.000
dc.date.accessioned 2020-06-30T06:08:37Z
dc.date.available 2020-06-30T06:08:37Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.issued 2019-10-15
dc.description.abstract <p>When Inconel 718 alloy is fabricated by selective laser melting and treated by traditional homogenization plus double aging heat treatment (HA), its strength improves greatly, but ductility decreases. A novel heat treatment (NHT) including higher temperature homogenization at 1150 °C for 2 h and one-time lower temperature aging treatment at 700 °C for 12 h is developed, which can overcome the strength-plasticity trade-off of Inconel 718 alloy. The results show that recrystallized grains with annealing twins and ultrafine strengthening phases form in the specimen subjected to the NHT. These microstructures differ from those in as-built and conventional heat-treated samples. Especially the morphology of strengthening phase γ″-Ni3Nb precipitated in the NHT specimen has changed a lot, it seems to be spherical rather than disc-like shape occurred in the traditional heat-treated samples. Consequently, the NHT process increases plasticity by 41%, while maintaining ultimate strength at the same level achieved by the traditional heat treatment. The enhanced ductility is attributed to the annealing twins and recrystallized grains without local strains, while the strength is provided by the smaller precipitates formed in the NHT one-time aging treatment.</p>
dc.description.comments <p>This article is published as Li, X., J. J. Shi, G. H. Cao, A. M. Russell, Z. J. Zhou, C. P. Li, and G. F. Chen. "Improved plasticity of Inconel 718 superalloy fabricated by selective laser melting through a novel heat treatment process." <em>Materials & Design</em> (2019): 107915. DOI: <a href="http://dx.doi.org/10.1016/j.matdes.2019.107915" target="_blank">10.1016/j.matdes.2019.107915</a>. Posted with permission.</p>
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dc.identifier archive/lib.dr.iastate.edu/mse_pubs/366/
dc.identifier.articleid 1369
dc.identifier.contextkey 16118225
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath mse_pubs/366
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/55712
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/mse_pubs/366/2019_RussellAlan_ImprovedPlasticity.pdf|||Fri Jan 14 23:48:15 UTC 2022
dc.source.uri 10.1016/j.matdes.2019.107915
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Metallurgy
dc.subject.keywords Inconel 718
dc.subject.keywords Selective laser melting
dc.subject.keywords Heat treatment
dc.subject.keywords Plasticity
dc.subject.keywords Annealing twins
dc.title Improved plasticity of Inconel 718 superalloy fabricated by selective laser melting through a novel heat treatment process
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication fb7c222e-fdb7-4931-9aa4-4bc43bea8231
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
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