On the fracture toughness of cemented carbides

Sigl, Lorenz S.; Fischmeister, H. F.

doi:10.1016/0001-6160(88)90143-5

Cited by 216 publications

(95 citation statements)

References 23 publications

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“…An example of such damage evolution within a binder ligament is shown in Figure 5. Obtained micrographs represent experimental evidence (and thus validate) several statements postulated by Sigl and co-workers after their systematic and thorough investigation on the fracture behavior of WC-Co cemented carbides [6,10,11,13], as follows:…”

Section: Toughening Mechanisms In Wc-co Cemented Carbidessupporting

confidence: 85%

“…Within this context, cracks propagate throughout the composite assembly, leaving isolated metallic ligaments behind the crack tip. As first described by Evans et al [8], cracks open with increasing applied load, and a multiligament zone develops at the crack wake [9][10][11]. For WCCo cemented carbides, this zone is reported to measure about five times the microstructural length scale (carbide grain size) and comprises between 2 and 4 ligaments in the direction of crack propagation [10,11].…”

Section: Introductionmentioning

confidence: 85%

“…As first described by Evans et al [8], cracks open with increasing applied load, and a multiligament zone develops at the crack wake [9][10][11]. For WCCo cemented carbides, this zone is reported to measure about five times the microstructural length scale (carbide grain size) and comprises between 2 and 4 ligaments in the direction of crack propagation [10,11]. The energy required to plastically deform the constrained ductile ligaments is the main contribution to the toughness of these materials [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 89%

“…This deformation is compensated by the formation of microcavities inside the ligament to uphold volume constancy [10,11]. Then, localized plastic deformation occurs at the bridges between the voids, leading to final failure of the ligaments by growth and coalescence of the microcavities ( Figure 5).…”

Section: Toughening Mechanisms In Wc-co Cemented Carbidesmentioning

confidence: 99%

“…The energy required to plastically deform the constrained ductile ligaments is the main contribution to the toughness of these materials [5][6][7][8][9][10][11][12]. Plastic deformation of these reinforcing ligaments is restricted to the binder regions crossed by the crack plane and proceeds through nucleation, growth and coalescence of microcrocavities [6,[9][10][11][12][13][14][15]. As in the case for brittle solids reinforced with a ductile phase (e.g.…”

Section: Introductionmentioning

confidence: 99%

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FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Tarragó

Jiménez‐Piqué

Schneider

et al. 2015

Materials Science and Engineering: A

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Exceptional fracture toughness levels exhibited by WC-Co cemented carbides (hardmetals) are due mainly to toughening derived from plastic stretching of crack-bridging ductile enclaves. This takes place due to the development of a multiligament zone at the wake of cracks growing in a stable manner. As a result, hardmetals exhibit crack growth resistance (R-curve) behavior.In this work, the toughening mechanics and mechanisms of these materials are investigated by combining experimental and analytical approaches. Focused Ion Beam technique (FIB) and Field-Emission Scanning Electron Microscopy (FESEM) are implemented to obtain serial sectioning and imaging of crack-microstructure interaction in cracks arrested after stable extension under monotonic loading. The micrographs obtained provide experimental proof of the developing multiligament zone, including failure micromechanisms within individual bridging ligaments. Analytical assessment of the multiligament zone is then conducted on the basis of experimental information attained from FIB/FESEM images, and a model for the description of R-curve behavior of hardmetals is proposed. It was found that, due to the large stresses supported by the highly constrained and strongly bonded bridging ligaments, WC-Co cemented carbides exhibit quite steep but short R-curve behavior. Relevant strength and reliability attributes exhibited by hardmetals may then be rationalized on the basis of such toughening scenario.

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Section: Toughening Mechanisms In Wc-co Cemented Carbidessupporting

confidence: 85%