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Grain Boundary Engineering of Stainless Steel Via Additive Manufacturing

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dc.contributorLi, Lin
dc.contributorKubacki, Gregory W
dc.contributor.advisorDaniewicz, Steven R
dc.contributor.authorMcAllister, Sarah
dc.date.accessioned2023-08-03T18:42:54Z
dc.date.available6/1/2028
dc.date.available2023-08-03T18:42:54Z
dc.date.issued2023
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractAdditive manufacturing followed by thermomechanical processing was investigated as a means to achieve grain boundary engineering. Different combinations of a 930°C recovery treatment, 0-30% cold-rolling, and a 1150°C solution annealing treatment were systematically applied to 316L stainless steel samples produced by laser powder bed fusion. The resulting microstructures were analyzed, including calculations of the special boundary and triple junction statistics, in order to assess the effects of each processing route. It was determined that a temperature above the recovery temperature was necessary to recrystallize the as-built microstructure and to relax internal strain created by the additive process. The lowest amount of cold-rolling resulted in the highest twin boundary length percentage in each sample set, so applying additional cold work did not help toward achieving grain boundary engineering. Longer time at the solution annealing temperature, however, did improve the grain boundary character distribution. While one sample was able to reach a twin boundary length percentage over 60%, none of the samples showed a breakup of the random-angle grain boundary network. Further research on breaking up the random-angle grain boundary network is recommended.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otherhttp://purl.lib.ua.edu/187892
dc.identifier.otheru0015_0000001_0004714
dc.identifier.otherMcAllister_alatus_0004M_15151
dc.identifier.urihttps://ir.ua.edu/handle/123456789/10527
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.
dc.subjectAdditive manufacturing
dc.subjectGrain boundary engineering
dc.subjectLaser powder bed fusion
dc.subjectStainless steel
dc.subjectTwin boundaries
dc.titleGrain Boundary Engineering of Stainless Steel Via Additive Manufacturingen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineMaterials Science
etdms.degree.grantorThe University of Alabama
etdms.degree.levelmaster's
etdms.degree.nameM.S.

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