Separation of the Formation Mechanisms of Residual Stresses in LPBF 316L

dc.contributor.authorUlbricht, Alexander
dc.contributor.authorAltenburg, Simon J.
dc.contributor.authorSprengel, Maximilian
dc.contributor.authorSommer, Konstantin
dc.contributor.authorMohr, Gunther
dc.contributor.authorFritsch, Tobias
dc.contributor.authorMishurova, Tatiana
dc.contributor.authorSerrano-Munoz, Itziar
dc.contributor.authorEvans, Alexander
dc.contributor.authorHofmann, Michael
dc.contributor.authorBruno, Giovanni
dc.date.accessioned2020-11-05T14:24:41Z
dc.date.available2020-11-05T14:24:41Z
dc.date.issued2020-09-14
dc.date.updated2020-10-07T22:19:34Z
dc.description.abstractRapid cooling rates and steep temperature gradients are characteristic of additively manufactured parts and important factors for the residual stress formation. This study examined the influence of heat accumulation on the distribution of residual stress in two prisms produced by Laser Powder Bed Fusion (LPBF) of austenitic stainless steel 316L. The layers of the prisms were exposed using two different border fill scan strategies: one scanned from the centre to the perimeter and the other from the perimeter to the centre. The goal was to reveal the effect of different heat inputs on samples featuring the same solidification shrinkage. Residual stress was characterised in one plane perpendicular to the building direction at the mid height using Neutron and Lab X-ray diffraction. Thermography data obtained during the build process were analysed in order to correlate the cooling rates and apparent surface temperatures with the residual stress results. Optical microscopy and micro computed tomography were used to correlate defect populations with the residual stress distribution. The two scanning strategies led to residual stress distributions that were typical for additively manufactured components: compressive stresses in the bulk and tensile stresses at the surface. However, due to the different heat accumulation, the maximum residual stress levels differed. We concluded that solidification shrinkage plays a major role in determining the shape of the residual stress distribution, while the temperature gradient mechanism appears to determine the magnitude of peak residual stresses.en
dc.identifier.eissn2075-4701
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11841
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10731
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc530 Physikde
dc.subject.otheradditive manufacturingen
dc.subject.otherLaser Powder Bed Fusionen
dc.subject.otherLPBFen
dc.subject.otherAISI 316Len
dc.subject.otheronline process monitoringen
dc.subject.otherthermographyen
dc.subject.otherresidual stressen
dc.subject.otherneutron diffractionen
dc.subject.otherX-ray diffractionen
dc.subject.othercomputed tomographyen
dc.titleSeparation of the Formation Mechanisms of Residual Stresses in LPBF 316Len
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber1234en
dcterms.bibliographicCitation.doi10.3390/met10091234en
dcterms.bibliographicCitation.issue9en
dcterms.bibliographicCitation.journaltitleMetalsen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume10en
tub.accessrights.dnbfreeen
tub.affiliationFak. 5 Verkehrs- und Maschinensysteme::Inst. Werkzeugmaschinen und Fabrikbetrieb::FG Verfahren und Technologien für hochbeanspruchte Schweißverbindungende
tub.affiliation.facultyFak. 5 Verkehrs- und Maschinensystemede
tub.affiliation.groupFG Verfahren und Technologien für hochbeanspruchte Schweißverbindungende
tub.affiliation.instituteInst. Werkzeugmaschinen und Fabrikbetriebde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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