Use of FIB/SEM to assess the tribo-corrosion of WC/Co hardmetals in model single point abrasion experiments

Gant, A.J.; Gee, M.G.; Gohil, D D; Jones, Helen; Orkney, L.P.

doi:10.1016/j.triboint.2012.11.008

Cited by 43 publications

(25 citation statements)

References 23 publications

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“…Alloying elements such as Co, Fe and Ni would improve the mechanical properties by reducing the brittle nature. Corrosion of cemented carbides (WC/Co) proceeds through selective binder dissolution at acidic condition, whereas the WC phase is not much affected by the corrosion attack in acidic medium, WC phase shows the active dissolution in alkaline medium, and may induce a detrimental effect on other critical performance [8][9][10][11][12][13]. Throughout mining, the tungsten carbide components are exposed to severe mechanical, chemical and thermal interaction.…”

Section: Introductionmentioning

confidence: 99%

Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Katiyar

Singh

et al. 2016

International Journal of Refractory Metals and Hard Materials

121

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Section: Introductionmentioning

confidence: 99%

Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Katiyar

Singh

et al. 2016

International Journal of Refractory Metals and Hard Materials

121

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“…Refs. [15][16][17][18][19]). Cemented carbides exhibit brittle fracture behaviour related to the propagation of pre-existing flaws which may be processing-, shaping-or service-induced defects (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The combined use of Focused Ion Beam (FIB) and Field Emission Scanning Electron Microscopy (FESEM) has been proved as an extremely useful technique for characterizing microstructure [28,29] and damage phenomena [19,27,28,[30][31][32] in cemented carbides. Following the above ideas, the aim of this investigation is two-fold: (1) to provide a thorough characterization of corrosion damage in cemented carbides immersed in a mine water solution, and (2) to study the detrimental effects of corrosion as a degrading factor of their mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Microstructural influence on tolerance to corrosion-induced damage in hardmetals

et al. 2016

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The influence of the microstructure on the tolerance of WC-Co cemented carbides to corrosion damage was studied by using residual strength as the critical design parameter. In doing so, samples were immersed in synthetic mine water solution for different times, and changes induced by corrosion exposure were assessed. A detailed 3D FIB/FESEM tomography characterization of corrosion damage-microstructure interactions is included. Results reveal that corrosion damage may result in relevant strength degradation on the basis of stress rising effects associated with the formation of surface corrosion pits. Thus, as immersion time increases strength gradually decreases. Fractographic examination reveals the formation of semi-elliptical and sharp corrosion pits for studied medium-and ultrafine-sized cemented carbides, respectively. The latter has a much more pronounced stress rising effect, and consequently higher strength losses were determined for ultrafine grades. Corrosion process consists of a selective attack of the binder that is dissolved in the corrosive media. Initially, it is located at centres of binder pools and as exposure time in the media increases, corrosion evolves consuming the rest of the pools which finally leaves an unsupported WC grain skeleton at the surface.

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“…Refs. [15,38,39]). For these reasons, the aim of this study is to investigate the fracture behavior of WC-Co cemented carbides by documenting and analyzing toughening phenomena through serial FIB sectioning and field emission scanning electron microscopy (FESEM) imaging.…”

Section: Introductionmentioning

confidence: 99%

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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Use of FIB/SEM to assess the tribo-corrosion of WC/Co hardmetals in model single point abrasion experiments

Cited by 43 publications

References 23 publications

Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Microstructural influence on tolerance to corrosion-induced damage in hardmetals

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

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