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dc.contributor.advisorDe Moor, Emmanuel
dc.contributor.authorJohnson, R. James
dc.date.accessioned2007-01-03T05:41:30Z
dc.date.accessioned2022-02-09T08:40:57Z
dc.date.available2014-03-01T04:18:44Z
dc.date.available2022-02-09T08:40:57Z
dc.date.issued2013
dc.identifierT 7355
dc.identifier.urihttps://hdl.handle.net/11124/80051
dc.description2013 Fall.
dc.descriptionIncludes illustrations (some color).
dc.descriptionIncludes bibliographical references (pages 49-53).
dc.description.abstractAustempering and Quenching & Partitioning steels are two processing approaches that may produce third generation advanced high strength steel properties, which are attractive to the automotive industry. Three 0.25C-2Mn-(1.5, 0.6, and 0.1)Si steels were austenitized and subsequently isothermally held at temperatures of 200-450 °C for 10-300 s. Significant fractions of retained austenite with differing morphologies, namely blocky retained austenite following austempering and fine film-like austenite following one-step Q&P were observed with X ray diffraction, Magnetic Saturation, Secondary Electron Imaging, and Electron Backscatter Diffraction. Tensile and hole expansion tests were conducted and correlated to strain hardening and microstructure rotation angle in the shear affected zone adjacent the sheared edge. At a given strength level, one-step Q&P produced superior hole expansion properties when compared to bainitic and mixed bainite/martensite microstructures.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2010-2019 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectretained austenite
dc.subjectadvanced high strength steel
dc.subjectsilicon
dc.subjectquenching and partitioning
dc.subjecthole Expansion
dc.subjectaustempering
dc.subject.lcshBainitic steel
dc.subject.lcshAustenite
dc.subject.lcshSteel, High strength -- Microstructure
dc.subject.lcshSteel, High strength -- Ductility
dc.subject.lcshMetals -- Quenching
dc.subject.lcshSilicon
dc.titleHole expansion of retained austenite containing CMnSi bainitic/martensitic steels
dc.typeText
dc.contributor.committeememberSpeer, J. G.
dc.contributor.committeememberFindley, Kip Owen
dcterms.embargo.terms2014-03-01
dcterms.embargo.expires2014-03-01
thesis.degree.nameMaster of Science (M.S.)
thesis.degree.levelMasters
thesis.degree.disciplineMetallurgical and Materials Engineering
thesis.degree.grantorColorado School of Mines
dc.rights.access6-month embargo


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