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dc.contributor.authorHarooni, Arshad
dc.date.accessioned2016-11-29 14:54:28 (GMT)
dc.date.available2017-03-30 04:50:10 (GMT)
dc.date.issued2016-11-29
dc.date.submitted2016-11-02
dc.identifier.urihttp://hdl.handle.net/10012/11084
dc.description.abstractZirconium is commonly used in nuclear, chemical processing and biomedical applications due to its low thermal neutron cross-section, relatively high corrosion resistance and great biocompatibility. Although it is an ideal candidate for laser cladding and Laser Additive Manufacturing (LAM), prior to this work very little research existed to prove that this was possible. This study used a Direct Energy Deposition (DED) method with localized shielding to successfully deposit commercially pure zirconium on zirconium alloy substrate. Effects of laser power, laser scan speed, laser spot size and powder feed rate were evaluated on deposition rate, dilution, geometrical circularity and presence of defects for single layer clads. Optimized parameters were used to deposit multilayer clads using recycled and as-received powder. Tempered as-received powder LAM deposits had higher ductility and Ultimate Tensile Strength (UTS) than commercially manufactured zirconium alloy. It is suggested that recycled powder deposits had reduced ductility due to presence of higher porosity and/or powder particles that were highly contaminated with atmospheric gases. These contaminated particles adhered poorly with the surrounding matrix and appeared as porosities during sample preparation and fracture testing. The optimized shielding gas nozzle design achieved levels of atmospheric contamination in LAM deposits comparable to conventionally manufactured zirconium alloys. Lack of adequate shielding resulted in changes in microstructure, microhardness, chemistry and appearance. Further optimization of shielding gas nozzle can allow in-situ repair of zirconium components and other reactive metals with just localized shielding.en
dc.language.isoenen
dc.publisherUniversity of Waterlooen
dc.subjectLaser Additive Manufacturingen
dc.subjectZirconiumen
dc.subjectLaser Claddingen
dc.subjectMechanical Propertiesen
dc.subjectMicrostructureen
dc.subjectShieldingen
dc.subjectProcessing Parametersen
dc.subjectPorosityen
dc.titlePowder Spray Laser Additive Manufacturing of Zirconiumen
dc.typeMaster Thesisen
dc.pendingfalse
uws-etd.degree.departmentMechanical and Mechatronics Engineeringen
uws-etd.degree.disciplineMechanical Engineeringen
uws-etd.degree.grantorUniversity of Waterlooen
uws-etd.degreeMaster of Applied Scienceen
uws-etd.embargo.terms4 monthsen
uws.contributor.advisorGerlich, Adrian
uws.contributor.advisorKhajepour, Amir
uws.contributor.affiliation1Faculty of Engineeringen
uws.published.cityWaterlooen
uws.published.countryCanadaen
uws.published.provinceOntarioen
uws.typeOfResourceTexten
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen


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