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Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

2019Journal article Open access
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dc.contributor.authorBarros, Rafael
dc.contributor.authorSilva, Francisco J.
dc.contributor.authorGouveia, Ronny M.
dc.contributor.authorSaboori, Abdollah
dc.contributor.authorMarchese, Giulio
dc.contributor.authorBiamino, Sara
dc.contributor.authorSalmi, Alessandro
dc.contributor.authorAtzeni, Eleonora
dc.date.accessioned2020-04-29T16:48:23Z
dc.date.available2020-04-29T16:48:23Z
dc.date.issued2019
dc.description.abstractResidual stresses (RS) of great magnitude are usually present in parts produced by Laser Powder Bed Fusion (PBF-LB), mainly owing to the extreme temperature gradients and high cooling rates involved in the process. Those “hidden” stresses can be detrimental to a part’s mechanical properties and fatigue life; therefore, it is crucial to know their magnitude and orientation. The hole-drilling strain-gage method was used to determine the RS magnitude and direction-depth profiles. Cuboid specimens in the as-built state, and after standard solution annealing and ageing heat treatment conditions, were prepared to study the RS evolution throughout the heat treatment stages. Measurements were performed on the top and lateral surfaces. In the as-built specimens, tensile stresses of ~400 MPa on the top and above 600 MPa on the lateral surface were obtained. On the lateral surface, RS anisotropy was noticed, with the horizontally aligned stresses being three times lower than the vertically aligned. RS decreased markedly after the first heat treatment. On heat-treated specimens, magnitude oscillations were observed. By microstructure analysis, the presence of carbides was verified, which is a probable root for the oscillations. Furthermore, compressive stresses immediate to the surface were obtained in heat-treated specimens, which is not in agreement with the typical characteristics of parts fabricated by PBF-LB, i.e., tensile stresses at the surface and compressive stresses in the part’s core.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3390/met9121290pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.22/15934
dc.language.isoengpt_PT
dc.publisherMDPIpt_PT
dc.relation.publisherversionhttps://www.mdpi.com/2075-4701/9/12/1290pt_PT
dc.subjectMetals Additive Manufacturingpt_PT
dc.subjectPBF-LBpt_PT
dc.subjectSuperalloypt_PT
dc.subjectHole-drilling strain-gage methodpt_PT
dc.subjectHeat treatmentspt_PT
dc.subjectResidual stresspt_PT
dc.subjectMicrostructurept_PT
dc.titleLaser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatmentpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue12pt_PT
oaire.citation.startPage1290pt_PT
oaire.citation.titleMetalspt_PT
oaire.citation.volume9pt_PT
person.familyNameBarros
person.familyNameSilva
person.givenNameRafael
person.givenNameFrancisco
person.identifier1422904
person.identifier.ciencia-idB81C-4758-2D59
person.identifier.orcid0000-0003-2864-074X
person.identifier.orcid0000-0001-8570-4362
person.identifier.ridI-5708-2015
person.identifier.scopus-author-id56870827300
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication752ec53a-685d-40f9-b6da-c26a98aa7f19
relation.isAuthorOfPublicationd050c135-4d9d-4fb2-97d1-cac97be3f6b9
relation.isAuthorOfPublication.latestForDiscovery752ec53a-685d-40f9-b6da-c26a98aa7f19

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