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dc.contributor.advisorLiu, Stephen
dc.contributor.authorWilson, Davis M.
dc.date.accessioned2019-06-14T15:39:27Z
dc.date.accessioned2022-02-03T13:17:25Z
dc.date.available2019-12-12T15:39:27Z
dc.date.available2022-02-03T13:17:25Z
dc.date.issued2019
dc.identifierWilson_mines_0052N_11746.pdf
dc.identifierT 8737
dc.identifier.urihttps://hdl.handle.net/11124/173079
dc.descriptionIncludes bibliographical references.
dc.description2019 Spring.
dc.description.abstractUtilization of austenitic stainless steels as a structural material is common across many industries due to the exceptional combination of strength, ductility, toughness, corrosion resistance and weldability. Recent improvements in the capabilities of metal additive manufacturing (AM) has brought these materials into focus for potential additional structural applications. Although the mechanical properties and solidification behavior is well understood for traditionally manufactured components, the same understanding is not directly transferable to an additively manufactured part. Deposits of 304L stainless steel were made from the same powder feedstock, using both Laser Powder Bed Fusion (L-PBF) and Laser Powder Directed Energy Deposition (LP-DED). Initial mechanical and metallographic testing results revealed a consistent anisotropic behavior related to the build direction as well as differences in solidification behavior between the two processes. Analysis of the solidification morphologies revealed that current predictive methods developed for welding can be applied to powder-based AM processes to predict the solidification morphology. \textit{In-situ} tensile testing with simultaneous electron backscatter diffraction (EBSD) allowed for observation of the deformation mechanisms that occur in both orientations. Through these tests, it was observed that deformation twinning occurs preferentially over slip in the as built direction, lowering the initial strain hardening rate of the material.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.rightsCopyright of the original work is retained by the author.
dc.subjectanisotropy
dc.subjectstainless steel
dc.subjectsolidification
dc.subjectadditive manufacturing
dc.titleMetallurgical and mechanical property characterization of additively manufactured 304L stainless steel
dc.typeText
dc.contributor.committeememberYu, Zhenzhen
dc.contributor.committeememberClarke, Amy
dc.contributor.committeememberMaguire, Michael
dc.contributor.committeememberRodelas, Jeffrey
dcterms.embargo.terms2019-12-12
dcterms.embargo.expires2019-12-12
thesis.degree.nameMaster of Science (M.S.)
thesis.degree.levelMasters
thesis.degree.disciplineMetallurgical and Materials Engineering
thesis.degree.grantorColorado School of Mines
dc.rights.accessEmbargo Expires: 12/12/2019


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