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Strength and reliability of WC-Co cemented carbides: understanding microstructural effects on the basis of R-curve behavior and fractography

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10.1016/j.ijrmhm.2017.11.031
 
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hdl:2117/112707

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Tarragó Cifre, Jose María
Coureaux Mustelier, David
Torres Hernández, Yadir
Jiménez Piqué, EmilioMés informacióMés informacióMés informació
Schneider, Ludwig
Fair, Jonathan
Llanes Pitarch, Luis MiguelMés informacióMés informacióMés informació
Document typeArticle
Defense date2018-02
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Strength and reliability of WC-Co cemented carbides (hardmetals) are dependent on effective fracture toughness as well as on nature, size and distribution of processing flaws. Regarding toughness, they exhibit a crack growth resistance (R-curve) behavior, derived from the development of a multiligament bridging zone at the crack wake. Accordingly, successful implementation of fracture mechanics requires consideration of tangency criterion, between applied stress intensity factor and R-curve, in addition to fractographic inspection. It is the aim of this study to evaluate the strength behavior of a series of experimental WC-Co grades on the basis of R-curve failure criteria. Results indicate that microstructural effects on the strength of hardmetals may be satisfactorily rationalized following the referred criterion. The analysis includes consideration of nature and distribution of fracture origins, found to be more diverse and wider, respectively, for the harder fine-grained grades. This experimental evidence, together with the fact that these hardmetals exhibit steeper rising R-curves than tougher coarse-grained ones, leads to lower reliability for the former. This investigation documents and validates the great relevance of R-curve behavior for optimizing the mechanical performance of WC-Co cemented carbides on the basis of microstructural design.
CitationTarrago, J., Coureaux, D., Torres, Y., Jimenez-Pique, E., Schneider, L., Fair, J., Llanes, L. Strength and reliability of WC-Co cemented carbides: understanding microstructural effects on the basis of R-curve behavior and fractography. "International journal of refractory metals and hard materials", Febrer 2018, vol. 71, p. 221. 
URIhttp://hdl.handle.net/2117/112707
DOI10.1016/j.ijrmhm.2017.11.031
ISSN0263-4368
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0263436817307631?via%3Dihub
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  • Departament de Ciència dels Materials i Enginyeria Metal·lúrgica - Articles de revista [961]
  • CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials - Articles de revista [217]
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