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dc.contributor.authorChikarakara, E.
dc.contributor.authorAqida, S.
dc.contributor.authorBrabazon, D.
dc.contributor.authorNaher, S.
dc.contributor.authorPicas Barrachina, Josep Anton
dc.contributor.authorPunset Fuste, Miquel
dc.contributor.authorForn Alonso, Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.date.accessioned2010-06-07T17:45:38Z
dc.date.available2010-06-07T17:45:38Z
dc.date.created2010
dc.date.issued2010
dc.identifier.citationChikarakara, E. [et al.]. Surface modification of HVOF thermal sprayed WC-CoCr coatings by laser treatment. A: ESAFORM Conference on Material Forming. "13th International ESAFORM Conference on Material Forming". Brescia: Springer, 2010, p. 1-4.
dc.identifier.urihttp://hdl.handle.net/2117/7557
dc.description.abstractIn this work the affects of laser characteristics on microstructure and microhardness of high velocity oxygen fuel sprayed (HVOF) WC–CoCr coatings were investigated. The coating was deposited with a Sulzer Metco WokaJet™-400 kerosene fuel and the laser surface treatments were applied using CO2 laser with 10.6 μm wavelength. Large variations in surface properties were produced from variation in the laser processing parameters. In total, four levels of peak power (100, 200, 300 and 350 W), four levels of spot diameter (0.2, 0.4, 0.6 and 1 mm) and three levels of pulse repetition frequency (PRF) were investigated. An initial set of tests were followed by a more detailed 33 factorial design of experiments. Pulse repetition frequency and duty cycle were set in order to maintain the same overlap in the x and y directions for the raster scanned sample spot impact dimensions. Overlaps of 30% were used in the initial tests and 10% in the more detailed trials. The results have shown that care must be taken to keep the irradiance at a relatively low level compared to uncoated surfaces. High irradiance can in this case result in rough and porous surfaces. Lower levels of irradiance are shown to provide more uniform microstructures, reduced porosity and increased microhardness.
dc.format.extent4 p.
dc.language.isoeng
dc.publisherSpringer
dc.subjectÀrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Làser
dc.subjectÀrees temàtiques de la UPC::Física::Física de l'estat sòlid::Superfícies
dc.subject.lcshSurface preparation
dc.subject.otherThermal spraying
dc.subject.otherLaser surface hardening
dc.subject.otherWC-CoCr
dc.subject.otherTooling
dc.titleSurface modification of HVOF thermal sprayed WC-CoCr coatings by laser treatment
dc.typeConference report
dc.subject.lemacSuperfícies -- Tractament
dc.contributor.groupUniversitat Politècnica de Catalunya. CDAL - Centre de Disseny d'Aliatges Lleugers i Tractaments de Superfície
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac2396987
dc.description.versionPostprint (published version)
local.citation.authorChikarakara, E.; Aqida, S.; Brabazon, D.; Naher, S.; Picas, J.A.; Punset, M.; Forn, A.
local.citation.contributorESAFORM Conference on Material Forming
local.citation.pubplaceBrescia
local.citation.publicationName13th International ESAFORM Conference on Material Forming
local.citation.startingPage1
local.citation.endingPage4


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