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dc.contributorLlanes Pitarch, Luis Miguel
dc.contributor.authorCanals Pou, Alberto María
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.date.accessioned2015-01-13T19:57:43Z
dc.date.available2015-01-13T19:57:43Z
dc.date.issued2014-10
dc.identifier.urihttp://hdl.handle.net/2099.1/24522
dc.description.abstractCemented carbides (WC-Co) are ceramic-metal composite materials made by hard tungsten carbide particles bonded through a metallic binder matrix, mainly of cobalt. It is a hard material characterized by an exceptional combination of strength, toughness and wear resistance. As result, cemented carbides are first choice materials for cutting tools and wear parts. However, final shaping of these components usually require diamond grinding. During this hard machining, surface integrity may became altered, particulary in terms of compression stresses and/or microcracking. Such defects can locally affect the mechanical properties. The aim of this investigation is to analyze the influence of the surface finish quality on the mechanical properties at the surface level for WC-Co materials as well as the influence over the properties of a TiN coating deposited on hardmetal substrates. The study has been done at micrometric (to analyze the general properties) and nanometric scale (local properties aiming to capture residual stress state effects) by using nanoindentation and nanoscratch testing. Tests done in plain view prove that roughness plays an important role in the assessment of mechanical properties at the surface, as it induces significant scatter, as compared to results determined on cross-sections. Finally, a sequential polishing process has been done in order to extract the polishing rate for cemented materials as well as study how roughness affects the mechanical properties measured. This process points out that roughness can mask surface damage, like cracks or chipping, among others. As a final conclusion, an optimized protocol is proposed to study the mechanical properties of the samples with high roughness and exhibiting a compressive residual stress state.
dc.language.isoeng
dc.publisherUniversitat Politècnica de Catalunya
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials::Assaig de fatiga
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials::Assaig de fractura
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Materials compostos
dc.subject.lcshTungsten carbide-colbalt alloys -- Mechanical properties
dc.subject.lcshMetals -- Mechanical properties
dc.subject.lcshCarbides -- Mechanical properties
dc.subject.lcshSurfaces (Physics)
dc.subject.lcshNanostructure materials
dc.titleCorrelation between surface damage and mechanical properties at micro- and nanometric length scale for WC-Co hardmetals
dc.typeMaster thesis (pre-Bologna period)
dc.subject.lemacAliatges de carbur de tungstè i cobalt -- Propietats mecàniques
dc.subject.lemacMetalls -- Propietats mecàniques
dc.subject.lemacCarburs -- Propietats mecàniques
dc.subject.lemacSuperfícies (Física)
dc.subject.lemacMaterials nanoestructurals
dc.rights.accessOpen Access
dc.audience.educationlevelEstudis de primer/segon cicle
dc.audience.mediatorEscola Tècnica Superior d'Enginyeria Industrial de Barcelona
dc.audience.degreeENGINYERIA DE MATERIALS (TITULACIÓ CONJUNTA AMB LA UB) (Pla 2003)


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