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Mechanics and mechanisms of fatigue in a WC-Ni hardmetal and a comparative study with respect to WC-Co hardmetals

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10.1016/j.ijfatigue.2014.09.011
 
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hdl:2117/26227

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Tarragó Cifre, Jose María
Ferrari, Claudio
Reig, Begoña
Coureaux Mustelier, David
Schneider, Ludwig
Llanes Pitarch, Luis MiguelMés informacióMés informacióMés informació
Document typeArticle
Defense date2015-01-01
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
There is a major interest in replacing cobalt binder in hardmetals (cemented carbides) aiming for materials with similar or even improved properties at a lower price. Nickel is one of the materials most commonly used as a binder alternative to cobalt in these metal-ceramic composites. However, knowledge on mechanical properties and particularly on fatigue behavior of Ni-base cemented carbides is relatively scarce. In this study, the fatigue mechanics and mechanisms of a fine grained WC-Ni grade is assessed. In doing so, fatigue crack growth (FCG) behavior and fatigue limit are determined, and the attained results are compared to corresponding fracture toughness and flexural strength. An analysis of the results within a fatigue mechanics framework permits to validate FCG threshold as the effective fracture toughness under cyclic loading. Experimentally determined data are then used to analyze the fatigue susceptibility of the studied material. It is found that the fatigue sensitivity of the WC-Ni hardmetal investigated is close to that previously reported for Co-base cemented carbides with alike binder mean free path. Additionally, fracture modes under stable and unstable crack growth conditions are inspected. It is evidenced that stable crack growth under cyclic loading within the nickel binder exhibit faceted, crystallographic features. This microscopic failure mode is rationalized on the basis of the comparable sizes of the cyclic plastic zone ahead of the crack tip and the characteristic microstructure length scale where fatigue degradation phenomena take place in hardmetals, i.e. the binder mean free path. (C) 2014 Elsevier Ltd. All rights reserved.
CitationTarrago, J. [et al.]. Mechanics and mechanisms of fatigue in a WC-Ni hardmetal and a comparative study with respect to WC-Co hardmetals. "International journal of fatigue", 01 Gener 2015, vol. 70, p. 252-257. 
URIhttp://hdl.handle.net/2117/26227
DOI10.1016/j.ijfatigue.2014.09.011
ISSN0142-1123
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0142112314002394#
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  • Departament de Ciència dels Materials i Enginyeria Metal·lúrgica - Articles de revista [961]
  • CIEFMA - Centre d'Integritat Estructural, Fiabilitat i Micromecànica dels Materials - Articles de revista [283]
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