Nanoindentation study of WC–12Co hardmetals obtained from nanocrystalline powders: Evaluation of hardness and modulus on individual phases

Bonache, V.; Rayón, E.; Salvador, M. D.; Busquets, D.

doi:10.1016/j.msea.2010.01.026

Cited by 59 publications

(47 citation statements)

References 31 publications

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“…The hardness for the carbonitride phases was consistent with the values reported for the following binary ceramic phases: TiC, TiN, NbC, NbN, TaC and TaN [45]. However, the nanohardness obtained for the binder phases composed of intermetallic compounds was, as expected, significantly higher than the values found for constrained Co in hardmetals and cermets [14,54,55]. The values observed were more characteristic of brittle intermetallic compounds.…”

Section: Mechanical Propertiessupporting

confidence: 87%

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Chicardi

Gotor

Medri

et al. 2016

Chemical Engineering Journal

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A mechanically induced self-sustaining reaction (MSR) has been successfully employed for manufacturing powdered cermets based on Ti, Ti-Ta and Ti-Nb carbonitrides using Co as the binder phase and Mo2C as the sintering additive. The powders were sintered by hot-pressing, and complete chemical, microstructural and mechanical characterizations were performed on the densified cermets. When elemental Ta, Nb and/or Mo2C were added to the initial raw mixture submitted to the MSR process, smaller ceramic grains were observed after sintering, which suggested that ceramic particle growth was hindered by the presence of Ta, Nb and/or Mo in the host titanium carbonitride structure. Nanoindentation measurements enabled the determination of the hardness of the ceramic and binder phases, and values in the range of 26-29 GPa and 14-16 GPa were found, respectively. The high hardness values of the binder were related to the formation of intermetallic phases.2

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Section: Mechanical Propertiessupporting

confidence: 87%

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Chicardi

Gotor

Medri

et al. 2016

Chemical Engineering Journal

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“…The largest deviation between K Ic and W K was calculated by the Niihara, Morrena, and Hasselman (NMH) model, which could be explained by different origins of the crack. The NMH model is developed for the realistic length of a crack (0.25 ≤ L/a ≤ 2.5), while WM is built on the asymptotic approximation of very long cracks (L > a) [14]. The same trend was noted for all samples.…”

Section: Analysis and Discussionmentioning

confidence: 81%

“…The values determined by the Warren and Matzke (WM) model do not differ much from the Palmqvist and SWMC values, but are lower. The reason for such a good agreement of WM-SWMC and WM models is due to the same physical ideas of the twodimensional trough-crack along the surface and spherical expansion of the stress field [14]. Additionally, the SWMC crack model was made on the basis of the WM model, but avoids the need for an asymptotic calculation and makes a minimum number of assumptions based on experimental observations of geometric cracks.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…Additionally, the SWMC crack model was made on the basis of the WM model, but avoids the need for an asymptotic calculation and makes a minimum number of assumptions based on experimental observations of geometric cracks. The equation for the SWMC model includes the dimensionless factor of 0.0889, which is derived from the geometry of the Vickers indent and Poisson's ratio of cemented carbides instead of being determined from the experiments [14]. The KIc deviation is decreased with a lowering of the Co content.…”

Section: Analysis and Discussionmentioning

confidence: 99%

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Vickers Indentation Fracture Toughness of Near-Nano and Nanostructured WC-Co Cemented Carbides

Fabijanić

Ćorić

Šnajdar

et al. 2017

Metals

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Abstract:In this paper, the fracture toughness K Ic of near-nano and nanostructured WC-Co cemented carbides by Vickers indentation fracture toughness (VIF) was investigated. The aim was to research the type of cracking occurring in near-nano and nano-grained WC-Co cemented carbides with respect to the Co content and, consequently, to evaluate the appropriateness of different models for the fracture toughness calculation. The mixtures with different binder content-4, 6, and 9 wt. % Co-were consolidated by sintering in a hydrogen atmosphere. Vickers indentation using a test force of 294 N was used for the determination of fracture toughness. The type of crack that occurred as a consequence of the applied load on the corners of the Vickers indentations was analysed with optical microscopy before and after repolishing the samples. Different crack models, Palmqvist and radial-median, were applied for the calculation of K Ic . Instrumented indentation testing was used to determine the modulus of elasticity of the consolidated samples. From the research it was found that near-nano and nanostructured cemented carbides with 9 and 6 wt. % Co do not exhibit median cracking and the indenter cracks remain radial in nature, while near-nano and nanostructured cemented carbides with 4 wt. % Co exhibit both radial and median cracking. Accordingly, it was concluded that the critical amount of the binder phase in near-nano and nanostructured WC-Co at which the crack changes its geometry from Palmqvist to radial-median is around 4 wt. % Co. Comparing different models it was found that K Ic values are not consistent and differ for each method used. Models from Exner crack resistance for the Palmqvist crack showed good agreement. Radial-median crack models showed significant K Ic deviations for the same testing conditions for all samples.

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“…The location of each test was guided by an optical microscope. Only in cases where coatings were found very fragile (high porosity or low density), the indentation depth was reduced below 150 nm and tests were guided by images of the coating topography using the Nanovision technology [29]. The images obtained by this method served to choose locations far from pores or defects for nanoindentation tests.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

Klyatskina

Rayón

Darut

et al. 2015

Surface and Coatings Technology

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Nanoindentation study of WC–12Co hardmetals obtained from nanocrystalline powders: Evaluation of hardness and modulus on individual phases

Cited by 59 publications

References 31 publications

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Vickers Indentation Fracture Toughness of Near-Nano and Nanostructured WC-Co Cemented Carbides

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

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