On the structural integrity of Fe-36Ni Invar alloy processed by selective laser melting

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dc.date.accessioned2023-12-22T13:23:59Z
dc.date.available2023-12-22T13:23:59Z
dc.date.issued2020
dc.description© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/eng
dc.identifierdoi:10.17170/kobra-202311309142
dc.identifier.urihttp://hdl.handle.net/123456789/15325
dc.language.isoeng
dc.relation.doidoi:10.1016/j.addma.2020.101603
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectInvar 36eng
dc.subjectadditive manufacturingeng
dc.subjectselective laser meltingeng
dc.subjectlow-cycle fatiqueeng
dc.subjectmicrostructureeng
dc.subject.ddc600
dc.subject.ddc660
dc.subject.swdInvar-Legierungger
dc.subject.swdRapid Prototyping <Fertigung>ger
dc.subject.swdSelektives Laserschmelzenger
dc.subject.swdErmüdung bei niedrigen Lastspielzahlenger
dc.subject.swdMikrostrukturger
dc.subject.swdMechanische Eigenschaftger
dc.titleOn the structural integrity of Fe-36Ni Invar alloy processed by selective laser meltingeng
dc.typeAufsatz
dc.type.versionacceptedVersion
dcterms.abstractSpecimens made from pre-alloyed Invar (Fe-36Ni) powder were fabricated by selective laser melting and stress-relief heat treated afterwards. A relative density of the fabricated parts of 99.6 % was determined by computed tomography. The microstructure and mechanical behavior under monotonic and particularly cyclic loading at ambient temperature were investigated. Results reveal a bimodal microstructure containing columnar and equiaxed grains with an average grain size of 75 μm and pronounced texture 〈001〉 || BD. The selective laser melted Invar is characterized by a homogeneous hardness distribution revealing no gradient with respect to the height of the fabricated parts. The mechanical response under monotonic tensile loading is characterized by a fairly ductile behavior. Total strain controlled low-cycle fatigue tests with varying strain amplitudes were performed. The cyclic deformation response is characterized by highly reproducible behavior in terms of stress amplitudes and number of cycles to failure. The corresponding half-life hysteresis loops reveal perfect Masing behavior. Post-mortem fractography revealed crack initiation in direct vicinity of the surfaces. The damage tolerance of Invar is found to be promoted by its high ductility. Finally, a low coefficient of thermal expansion, very similar to conventionally processed Invar, was shown by dilatometer tests in the temperature range of 0 °C–180 °C.eng
dcterms.accessRightsopen access
dcterms.creatorWegener, Thomas
dcterms.creatorBrenne, Florian
dcterms.creatorFischer, Andreas
dcterms.creatorMöller, Timo
dcterms.creatorHauck, Christoph
dcterms.creatorAuernhammer, Stefan
dcterms.creatorNiendorf, Thomas
dcterms.source.articlenumber101603
dcterms.source.identifiereissn:2214-7810
dcterms.source.journalAdditive Manufacturingeng
dcterms.source.volumeVolume 37
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