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dc.contributor.advisorSpeer, J. G.
dc.contributor.advisorFindley, Kip Owen
dc.contributor.authorHosoda, Takashi
dc.date.accessioned2007-01-03T06:24:58Z
dc.date.accessioned2022-02-09T09:04:36Z
dc.date.available2007-01-03T06:24:58Z
dc.date.available2022-02-09T09:04:36Z
dc.date.issued2014
dc.date.submitted2014
dc.identifierT 7597
dc.identifier.urihttp://hdl.handle.net/11124/10611
dc.description2014 Fall.
dc.descriptionIncludes illustrations (some color).
dc.descriptionIncludes bibliographical references (pages 148-155).
dc.description.abstractThe microstructural and texture development with thermomechanical processing, performed through a combination of cold-rolling and annealing, in MA-956 plate consisting of a layered and inhomogeneous microstructure was systematically assessed. The alloy contained in mass percent, 20 Cr, 4.8 Al, 0.4 Ti, 0.4 Y2O3, and the balance iron. The starting material was as-hot-rolled plate, 9.7 mm thick. The as-hot-rolled plate was subjected to 40%, 60%, and 80% cold-rolling reduction and subsequently annealed at 1000, 1200, or 1380. Assessment of microstructural and texture developments before and after cold-rolling and annealing was performed using light optical microscopy (LOM), Vickers hardness testing, and electron backscatter diffraction (EBSD). Locally introduced misorientations by cold-rolling in each region were evaluated by Kernel Average Misorientation (KAM) maps. The as-hot-rolled condition contained a layered and inhomogeneous microstructure consisting of thin and coarse elongated grains, and aggregated regions which consisted of fine grains and sub-grains with {100} <011> texture parallel to the longitudinal direction. The microstructure of the 40% cold-rolled condition contained deformation bands, and the 60% and 80% cold-rolled conditions also contained highly deformed regions where the deformation bands were intricately tangled. A predominant orientation of (001) parallel to the rolling direction was developed during cold-rolling, becoming more prominent with increasing reduction. The magnitudes of KAM angles varied through the thickness depending on the initial microstructures. Recrystallization occurred in regions where high KAM angles were dense after annealing and nucleation sites were the aggregation regions, deformation bands, and highly deformed regions. The shape and size of the recrystallized grains varied depending on the nucleation sites.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2014 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectMA-956
dc.subject.lcshAlloys -- Microstructure
dc.subject.lcshAlloys -- Heat treatment
dc.subject.lcshRecrystallization (Metallurgy)
dc.subject.lcshAnnealing of metals
dc.subject.lcshAlloys -- Testing
dc.titleMicrostructure and texture evolution in cold-rolled and annealed alloy MA-956
dc.typeText
dc.contributor.committeememberVan Tyne, C. J.
dc.contributor.committeememberThompson, S. W. (Steven W.)
thesis.degree.nameMaster of Science (M.S.)
thesis.degree.levelMasters
thesis.degree.disciplineMetallurgical and Materials Engineering
thesis.degree.grantorColorado School of Mines


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