Fracture of WC–Ni cemented carbides with different shape of WC crystals

Shatov, A.V.; Ponomarev, S. S.; Фирстов, С. А.

doi:10.1016/j.ijrmhm.2007.03.002

Cited by 48 publications

(21 citation statements)

References 16 publications

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“…Ref. [1,4,[13][14][15][16][17][18]). Gurland and Bardzil documented that the strength initially increases with the binder mean free path (λ Co ) until it reaches a maximum at λ Co values around 0.3-0.6 μm, and then it starts decreasing [13].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…In addition to the average size and distribution of the carbide phase, the shape of WC particles is also an important microstructural factor to characterize. In this regard, Shatov and coworkers have suggested that it may also have a significant influence on the mechanical properties of hardmetals [22]. Determined circularity for studied materials is shown in From Table 2 it is interesting to point out that LI and IA -A measurement methods yield obtained, using the three investigated measurement methods, is shown in Figure 2 for the 10C?…”

Section: Carbide Grain Size Distributionmentioning

confidence: 90%

Implementation of an effective time-saving two-stage methodology for microstructural characterization of cemented carbides

Tarragó

Coureaux

Torres

et al. 2016

International Journal of Refractory Metals and Hard Materials

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Linear intercept on scanning electron microscopy micrographs is the most commonly used measurement method to determine carbide grain size and contiguity in WC-Co cemented carbides (hardmetals). However, it involves manual time-consuming measurements and is critically dependent on the quality of the micrographs as well as on the identification and definition of grain boundaries. In this study a two-stage methodology for microstructural characterization of hardmetals is presented.

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“…Secondly, the flatter shape of WC crystals increases both the likelihood for the crack tip to meet the bigger basal facets and the average length of the path around WC crystals, thus it is more advantageous to break through WC crystals than to go around it through the cobalt, WC/Co, and WC/WC interfaces. 5) Therefore the amount of trans-crystalline fracture through WC increases when the shape of WC crystals becomes flatter triangular prism with lower value of P WC .…”

Section: 2mentioning

confidence: 98%

“…Fracture C and C/C belong to brittle fracture, while fracture B/C and B belong to ductile fracture. 5,14,15) Figure 4 shows the effect of seed addition on the propagation path of the vickers indentation crack. Although WC-10Co added by the seeds still shows a mixed fracture mode including major brittle fracture and minor ductile fracture, an increase in the amount of C fracture can be observed.…”

Section: The Effect Of Seed Addition On the Fracturementioning

confidence: 99%

“…In recent years, the researchers have found that the toughness of cemented carbides with plate-like WC grains can be increased without the decrease of hardness. [1][2][3][4][5][6] It also exhibits higher fatigue strength, creep resistance and thermal shock resistance at elevated temperatures than traditional cemented carbides. 7) Therefore, cemented carbides with plate-like WC grains will have a great future.…”

Section: Introductionmentioning

confidence: 99%

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Hardening and Toughening Mechanisms of Cemented Carbides with Plate-Like WC Grains Prepared by Seeding

Liu

Zhu

2011

Mater. Trans.

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WC-10Co (mass pct.) cemented carbides containing plate-like WC grains were prepared by using plate-like WC single crystals as seeds. With the increase of seed addition amount, more and bigger plate-like WC grains are formed, the hardness and transverse rupture strength (TRS) increase first and then decrease. When 2.5 mass% seeds are added in WC-10Co, the density is hardly affected, whereas the hardness and TRS increase simultaneously, especially TRS increases by 12.8%. The hardening and toughening mechanisms of WC-10Co cemented carbides with plate-like WC grains were discussed.

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Fracture of WC–Ni cemented carbides with different shape of WC crystals

Cited by 48 publications

References 16 publications

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

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

Implementation of an effective time-saving two-stage methodology for microstructural characterization of cemented carbides

Hardening and Toughening Mechanisms of Cemented Carbides with Plate-Like WC Grains Prepared by Seeding

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