Microstructural effects on the R-curve behavior of WC-Co cemented carbides

Tarragó, J.M.; Coureaux, D.; Torres, Yadir; Casellas, Daniel; Al-Dawery, I.; Schneider, L.; Llanes, L.

doi:10.1016/j.matdes.2016.02.115

Cited by 39 publications

(31 citation statements)

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“…Second, as previously commented in the introduction, cemented carbides exhibit a rising crack growth resistance behavior that imparts reliability and damage tolerance to hardmetals tools and components [29][30][31][32]. The effective reliability enhancement derived from the crack bridging mechanism is a function of both fracture toughness and fracture strength of the composite material [22].…”

Section: Accepted Manuscriptmentioning

confidence: 87%

“…This mechanism entails the development of a rising crack growth resistance curve [21]. The authors of this paper recently reported a relevant influence of microstructure on the R-curve characteristics of hardmetals [22]. It is the purpose of this investigation to evaluate the microstructure-strength relations for a series of experimental WC-Co grades on the basis of R-curve failure criteria.…”

Section: Accepted Manuscriptmentioning

confidence: 97%

“…for d WC + λ Co lengths of around 1 μm [22]. Consequently, it is reasonable to expect lower Weibull modulus for hardmetals with short binder mean paths than for coarser materials.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The crack growth resistance curve for investigated hardmetals can be estimated from an equation recently published by the authors to describe R-curve behavior of cemented carbides [21,22]:…”

Section: Estimation Of the Critical Flaw Sizementioning

confidence: 99%

“…According to tangency criterion, rising R-curve materials fracturing from the propagation of "short" cracks are not able to develop the whole toughening capability, and fracture at effective toughness levels (K eff ) lower than the intrinsic fracture toughness measured for long cracks [21,22,32,35,36]. Furthermore, Rcurve materials also exhibit stable subcritical crack growth extension before catastrophic failure.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

See 4 more Smart Citations

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

Tarragó

Coureaux

Torres

et al. 2018

International Journal of Refractory Metals and Hard Materials

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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.

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Section: Accepted Manuscriptmentioning

confidence: 87%

Section: Accepted Manuscriptmentioning

confidence: 97%

“…for d WC + λ Co lengths of around 1 μm [22]. Consequently, it is reasonable to expect lower Weibull modulus for hardmetals with short binder mean paths than for coarser materials.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Estimation Of the Critical Flaw Sizementioning

confidence: 99%