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- W1901363705 abstract "Resumen:La integridad mecanica de carburos cementados WC-Co ha sido estudiada por medio del analisis del crecimiento subcritico de grietas y de la resistencia a la degradacion por cargas ciclicas. La investigacion se llevo a cabo en tres grados de metales duros con diferente contenido de aglutinante y/o tamano de grano, mediante el analisis del crecimiento de grietas por fatiga y ensayos de resistencia a la fatiga a temperatura ambiente. Los resultados de resistencia a fatiga fueron comparados con datos experimentales de tenacidad de fractura y resistencia a la flexion. Bajo cargas ciclicas y dentro del contexto de la mecanica de la fatiga se puede determinar el umbral de propagacion de grietas por fatiga como la tenacidad de fractura efectiva. Adicionalmente, se encontro que la aglomeracion de granos gruesos y granos anormalmente gruesos constituyen los defectos criticos presentes en estos tipos de metal duro. Los resultados de EBSD sugieren que la transformacion martensitica de la fase de cobalto (de fcc a hcp) no esta asociada exclusivamente a la carga ciclica aplicada, sino que probablemente puede ser inducida por procedimientos de desbaste de las superficies expuestas. Desde la perspectiva de los micromecanismos de fatiga, dicha deformacion se encuentra claramente localizada dentro de la fase aglutinante. Abstract:The mechanical integrity of WC-Co hardmetals has been studied by the occurrence of subcritical crack growth and strength degradation under cycling loading. The investigation is conducted on three WC-Co hardmetals grades with different binder content and/or grain size by assessing fatigue crack growth (FCG) behavior and fatigue life tests at room temperature . Experimental fatigue results are compared to fracture toughness and flexural strength data. An analysis of the results within a fatigue mechanics context permits to corroborate FCG threshold as the effective fracture toughness under cyclic loading. Critical defects are evidenced to be agglomerates of coarse grains and abnormally coarse grains. EBSD mapping on stable propagated cracks has been accomplished to characterize the crack-microstructure interactions within the cobalt phase. EBSD results suggest that martensitic transformation of cobalt phase (from fcc to hcp) is not exclusively associated with cyclic loading, as it had been postulated in the literature. On the other hand, it seems to be induced by rough grinding of the exposed surfaces. From the perspective of fatigue micromechanisms, they are clearly localized within the binder phase." @default.
- W1901363705 created "2016-06-24" @default.
- W1901363705 creator A5038215406 @default.
- W1901363705 date "2014-08-31" @default.
- W1901363705 modified "2023-09-24" @default.
- W1901363705 title "Fatigue Behavior and Associated Binder Deformation Mechanisms in WC-Co Cemented Carbides" @default.
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- W1901363705 doi "https://doi.org/10.33333/rp.v34i1.327" @default.
- W1901363705 hasPublicationYear "2014" @default.
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