Show simple item record

dc.contributor.authorWilliams, Desen
dc.date.accessioned2020-08-21T20:10:19Z
dc.date.available2020-08-21T20:10:19Z
dc.identifier.urihttp://hdl.handle.net/1974/28022
dc.description.abstractA failure analysis was performed on an alloy C-276 pull rod which underwent unexpected brittle, fracture after exposure to nuclear-relevant, high temperature aqueous environments: Pb-contaminated alkaline (8.5 < pH300C < 9.5), and sulfate-containing acidic solutions (3.0 < pH300C < 5.0). The component was characterized using advanced electron microscopy methods to demonstrate the benefits of these techniques for determining the nanoscale chemical and material factors contributing to stress corrosion cracking (SCC), and to provide insight into the mechanism of failure. Site-specific transmission electron microscopy samples containing crack tips were prepared using a focused ion beam. Nanoscale chemical characterization methods revealed that Pb was present in some oxidized regions of cracks, suggesting that the element may be inhibiting or impairing the passivity of the Cr-rich oxide. Complementary nanoscale microstructural analysis was performed. At an intergranular to transgranular cracking mode transition, it was observed that the transgranular crack (and corrosion process) propagated along the (110) crystallographic plane. Also, the cracking mode was highly dependent on the tensile stress direction relative to grain boundary orientation, the crystallographic orientation of grains, and slip systems. A comparison of results with proposed mechanisms for SCC of Ni alloys in similar environments are discussed; the highly directional nature of cracking is consistent with a slot-tunnel corrosion mechanism.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectStress Corrosion Crackingen
dc.subjectHastelloy C-276en
dc.subjectTransmission Electron Microscopyen
dc.subjectScanning Electron Microscopyen
dc.subjectFocused Ion Beamen
dc.subjectTransmission Kikuchi Diffractionen
dc.subjectSlot-Tunnel Corrosionen
dc.titleApplication of Nano-Scale Characterization Techniques in Failure Analysis of Stress Corrosion Cracking in an Alloy C-276 Pull Roden
dc.typethesisen
dc.description.degreeM.A.Sc.en
dc.contributor.supervisorPersaud, Suraj
dc.contributor.departmentMechanical and Materials Engineeringen
dc.degree.grantorQueen's University at Kingstonen


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
Except where otherwise noted, this item's license is described as Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada