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dc.contributor.authorKotas, Agnieszka Betzwar
dc.contributor.authorDanninger, Herbert
dc.contributor.authorWeiss, Brigitte
dc.contributor.authorMingard, K.P.
dc.contributor.authorSánchez, José
dc.contributor.authorLlanes Pitarch, Luis Miguel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.identifier.citationKotas, A.B., Danninger, H., Weiss, B., Mingard, K.P., Sánchez, J., Llanes, L. Fatigue testing and properties of hardmetals in the gigacycle range. "International journal of refractory metals and hard materials", 1 Gener 2017, vol. 62, núm. Part B, p. 183-191.
dc.description.abstractHardmetal products are frequently fatigue loaded in service, such as e.g. cutting tools for milling or percussion drills. In the present work, the fatigue behaviour of hardmetals was investigated into the gigacycle range using ultrasonic resonance fatigue testing at 20 kHz in push-pull mode at R = - 1. Liquid cooling was afforded using water with addition of a corrosion inhibitor. Hourglass shaped specimens were prepared, the surface being ground and polished with subsequent stress-relieving anneal to remove the high compressive residual stresses introduced during grinding. S-N curves with fairly low scatter were obtained, which indicates microstructure-controlled and not defect-controlled failure. Low binder content as well as fine WC grains were found to improve the fatigue endurance strength. In no case, however, a horizontal branch of the S-N curve was observed, i.e. there is no fatigue “limit” at least up to 1010 cycles. The initiation sites were in part difficult to identify; in such cases when the site was clearly visible, decohesion of the binder from large WC grains seems to have caused crack initiation. This further corroborates that microstructural features and not singular defects as e.g. inclusions are the initiation sites, which underlines the high purity of the hardmetal grades used. Based on fracture mechanical consideration a damage diagram was determined allowing to deduce critical defect sizes.
dc.format.extent9 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subject.otherGigacycle fatigue
dc.subject.otherWC-Co hardmetals
dc.subject.otherUltrasonic fatigue testing
dc.subject.otherFatigue endurance strength
dc.subject.otherFracture mechanics
dc.subject.otherCrack initiation
dc.titleFatigue testing and properties of hardmetals in the gigacycle range
dc.subject.lemacMaterials -- Fatiga
dc.subject.lemacMaterials durs
dc.contributor.groupUniversitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorKotas, A.B.; Danninger, H.; Weiss, B.; Mingard, K.P.; Sánchez, J.; Llanes, L.
local.citation.publicationNameInternational journal of refractory metals and hard materials
local.citation.numberPart B

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