Show simple item record

dc.contributor.authorAllen, Gregory
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2011-01-17 20:39:25.621en
dc.date.accessioned2011-01-18T16:58:03Z
dc.date.available2011-01-18T16:58:03Z
dc.date.issued2011-01-18T16:58:03Z
dc.identifier.urihttp://hdl.handle.net/1974/6275
dc.descriptionThesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2011-01-17 20:39:25.621en
dc.description.abstractZirconium alloy pressure tubes are an important component in CANDU nuclear reactors. During operation these tubes can pick up hydrogen as a result of a corrosion reaction, which can eventually lead to the precipitation of a secondary, brittle zirconium hydride phase. Hydrides tend to first form at flaws (stress concentrations), and when they fracture can initiate a time-controlled crack growth mechanism known as delayed hydride cracking (DHC). Since DHC is a known failure mechanism for pressure tubes, and an ongoing concern in the nuclear industry, more fundamental knowledge is required about the behaviour of hydrides precipitated at flaws. Several approaches were employed in this thesis to better characterize the effects and behaviour of hydrides at such stress concentrations. High energy X-ray diffraction, as well as in-situ SEM testing coupled with digital image correlation, were used to map the strains around stress concentrations where hydrides were present. These studies highlighted important differences in the behaviour of the hydride phase and the surrounding zirconium. To gain greater insight into hydride morphology, neutron tomography was used in an attempt to measure the through-thickness hydride distribution at flaws. A finite element model was also developed and verified against the X-ray strain mapping results. This model provided greater insight into details that could not be obtained directly from the experimental approaches, as well as providing a framework for future modeling to predict the effects of hydride precipitation under different conditions. Taken as a whole, these studies provide important information for improving service guidelines and avoiding conditions that favour embrittlement due to hydride precipitation.en
dc.languageenen
dc.language.isoenen
dc.relation.ispartofseriesCanadian thesesen
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.subjectMaterials Scienceen
dc.subjectNuclear Materialsen
dc.subjectZirconiumen
dc.subjectHydridesen
dc.titleADVANCED TECHNIQUES FOR THE CHARACTERIZATION OF HYDRIDED ZIRCONIUM ALLOYen
dc.typethesisen
dc.description.degreeMasteren
dc.contributor.supervisorDaymond, Mark R.en
dc.contributor.supervisorHolt, Richard A.en
dc.contributor.departmentMechanical and Materials Engineeringen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record