Effects of NbC additions on the microstructure and properties of non-uniform structure WC-Co cemented carbides

Gao, Yang; Yan, Ming‐Yuan; Luo, Binghui; Ouyang, Sheng; Chen, Wei; Bai, Zongqing; Jing, Hui-bo; Zhang, Wen

doi:10.1016/j.msea.2017.01.077

Cited by 65 publications

(23 citation statements)

References 34 publications

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“…However, it was found that the fracture toughness decreases gradually as the Cr 2 C 3 /VC content increases, as shown in Figure 9 . As well known, the fracture toughness is inversely proportional to the hardness and thus the fracture toughness decreases as the hardness increases [ 39 ]. Among all studied samples, sample 1# has the highest fracture toughness of 9.88 MPa.m 1/2 due to the lowest hardness.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cr3C2 and VC Content on WC Grain Size, WC Shape and Mechanical Properties of WC–6.0 wt. % Co Cemented Carbides

et al. 2021

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In this paper, the influences of Cr3C2/VC content on WC grain size, WC grain shape and mechanical properties of WC–6 wt. % Co cemented carbides were investigated. The results showed that the grain size first rapidly decreased and then slightly decreased with the increasing Cr3C2/VC content, and VC led to finer grain size and narrower size distribution. HRTEM/EDS analysis of the WC/Co interface indicates that the segregation concentration of V is much larger than that of Cr, which may be a strong response to the higher inhibition efficiency of VC. The addition of Cr3C2 induced triangular prism shape WC grains while VC generated stepped triangular prism grains. Despite the grain growth inhibitor (GGI) mechanisms of Cr3C2/VC have been extensively studied in the literature, the doping amount, especially the doping limit, has not been systematically investigated. In this work, the saturated solubilities of Cr and V in cobalt binder phase along with carbon content hare been predicted based on thermodynamic calculations. Based on the theoretical calculations, the doping amount of Cr3C2/VC is designed to be gradually increasing until more or less over their maximum solubilities in the binder phase, thereby investigating the subsequent microstructure and mechanical properties. When the doping of Cr3C2/VC exceeds the maximum solubility in Co phase, Co-rich Cr-carbides and Co-deficient V-carbides would form respectively, which were detrimental to the transverse rupture strength (TRS) and impact toughness. The hardness increased with the increasing Cr3C2/VC content, while the fracture toughness decreased with the increasing Cr3C2/VC content. The TRS initially enhanced and then declined, but the stepped triangular prism shape grains and low fraction of WC/Co interface in WC–6Co–VC cemented carbide led to a more pronounced decline in the TRS. The sample with 0.6 wt. % Cr3C2 addition had good comprehensive mechanical properties, its hardness, fracture toughness and TRS were 1880 kg/mm2, 9.32 MPa·m1/2 and 3450 MPa, respectively.

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Section: Resultsmentioning

confidence: 99%

Influence of Cr3C2 and VC Content on WC Grain Size, WC Shape and Mechanical Properties of WC–6.0 wt. % Co Cemented Carbides

et al. 2021

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“…It is noted in Figure 3C, the (Nb, W)C solid solution appeared in the WC-8(Co-Ni-Nb) sintered sample, which is due to the solubility of WC in NbC could reach 38 wt.% at 1300°C. 25 However, the solubility of NbC in the binder phase at room temperature is very low. 26 Therefore, the WC phase will be partially dissolved in NbC to form a (Nb, W)C solid solution.…”

Section: Characterizationmentioning

confidence: 99%

Effects of composite binder phase on microstructure and mechanical properties of ultrafine‐grained cemented carbides

Wang

Sun

et al. 2020

Int J Applied Ceramic Tech

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In order to develop a new high-performance binder phase, four different alloys Co-Ni-Fe, Co-Ni-Cr, Co-Ni-Nb, and AlCoCrNiNb 0.5 were used as a binder in cemented carbides. The room-temperature mechanical properties and high-temperature flexural strength of cemented carbides were studied. The results show that the optimal mechanical properties for the WC-8(Co-Ni-Fe, Co-Ni-Cr, Co-Ni-Nb, and AlCoCrNiNb 0.5) can be obtained at the sintering temperatures of 1200°C, 1350°C, 1350°C, and 1300°C, respectively. Compared with cemented carbides with Co as binder phase, the hardness of the four kinds of alloys is increased, the WC grain size becomes finer, but the fracture toughness is slightly decreased. When the temperature is under 600°C, there is no visible oxidation of the four kinds of cemented carbides, and their bending strengths are basically not reduced. When the temperature increased from 600°C to 900°C, the WC-8(Co-Ni-Nb) and WC-8(Co-Ni-Fe) samples present the better high-temperature bending resistance compared with the WC-8(Co-Ni-Cr) and WC-8AlCoCrNiNb 0.5 samples, with respective decrease in bending strength of 11.7% and 7.3%. K E Y W O R D S carbides, composite binder phase, mechanical properties, spark plasma sintering How to cite this article: Yu B, Wang Z, Sun N, et al. Effects of composite binder phase on microstructure and mechanical properties of ultrafine-grained cemented carbides.

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“…For TW10, cracks mainly extend along grain boundaries of WC. It is well known that cracks mainly propagate along WC/WC and WC/ Co in ultrafine WC-Co because the fracture energy for transgranular fracture is higher than that of intergranular fracture [8,29]. It is difficult to observe the cracks passing through (Ti, W)C phases due to the low (Ti, W)C content, as shown in Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Some studies have reported that adding some cubic carbides (TiC, TaC, NbC) to WC-Co brings out the (M, W)C (M = Ti/Ta/Nb) solid solution [6,7]. Gao et al [8] reported that adding NbC in WC-Co causes W dissolved into NbC grains to form (Nb,W)C. TiC is a kind of stable carbide with higher hardness than WC. The addition of TiC effectively increases the hardness and improves wear resistance of WC-Co materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of (Ti, W)C Addition on the Microstructure and Mechanical Properties of Ultrafine WC–Co Tool Materials Prepared by Spark Plasma Sintering

Wang

Yuan

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this study, powder mixtures containing (Ti, W)C additions (10, 20, 30 and 40 wt%) were prepared and then consolidated at 1200, 1250, 1300 and 1350 °C by spark plasma sintering. The effect of (Ti, W)C additions on the microstructure and mechanical properties of ultrafine WC-Co materials was investigated. The results demonstrate that the (Ti, W)C not only retards the sintering densification but also increases the porosity of sintered samples. The increasing sintering temperature is beneficial to the densification but results in the grain coarsening and the dissolution of W in (Ti, W)C. Moreover, there are no (Ti, W)C grains with obvious core/rim structure in the microstructure. With the (Ti, W)C increasing from 10 to 20 wt%, the hardness increases and fracture toughness changes hardly. However, the hardness and fracture toughness decrease slightly as the (Ti, W)C further increases. The transgranular fracture of (Ti, W)C phases is responsible for the slight reduction in fracture toughness. The sample with 20 wt% (Ti, W)C has high hardness and fracture toughness (H V : 21.3 GPa, K IC : 9.8 MPa m 1/2).

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Effects of NbC additions on the microstructure and properties of non-uniform structure WC-Co cemented carbides

Cited by 65 publications

References 34 publications

Influence of Cr3C2 and VC Content on WC Grain Size, WC Shape and Mechanical Properties of WC–6.0 wt. % Co Cemented Carbides

Influence of Cr3C2 and VC Content on WC Grain Size, WC Shape and Mechanical Properties of WC–6.0 wt. % Co Cemented Carbides

Effects of composite binder phase on microstructure and mechanical properties of ultrafine‐grained cemented carbides

Effects of (Ti, W)C Addition on the Microstructure and Mechanical Properties of Ultrafine WC–Co Tool Materials Prepared by Spark Plasma Sintering

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