Strengthening mechanism of cemented carbide containing Re

Jing, Kaifeng; Guo, Zhixing; Hua, Tao; Xiong, Ji; Lei, Jun; Liang, Lei; Yang, Senlin; Yi, Jiansong; Zhang, Hong

doi:10.1016/j.msea.2022.142803

Cited by 21 publications

(9 citation statements)

References 42 publications

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“…Table 4 shows a comparison of the measured data with those reported in the literature. 14,16,[38][39][40][41][42][43][44][45][46] For a given Co content, the hardness of cemented carbides reported in the literature is higher than that reported in this study. This is mainly because, during the conventional liquid phase sintering process, the grain size of WC increased significantly, whereas SPS is a low-temperature and rapid sintering technology which is beneficial for inhibiting grain growth, thus improving the hardness of cemented carbides.…”

Section: Hardness and Fracture Toughnesscontrasting

confidence: 82%

“…Table 4 shows a comparison of the measured data with those reported in the literature 14,16,38–46 . For a given Co content, the hardness of cemented carbides reported in the literature is higher than that reported in this study.…”

Section: Resultsmentioning

confidence: 49%

“…The addition of grain growth inhibitors such as VC, Mo 2 C, and Al 2 O 3 can effectively inhibit the growth of WC grains during sintering. Compared with the cemented carbides reported in the literature, 14,16,38–46 the cemented carbides prepared in this study show satisfactory fracture toughness, probably because of the relatively large WC grains, which can prevent crack propagation.…”

Section: Resultsmentioning

confidence: 65%

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Effects of carbothermal prereduction temperature and Co content on mechanical properties of WC–Co cemented carbides

Deng

Kang

Zhang

2023

Int J Applied Ceramic Tech

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WC–Co cemented carbides were prepared via an in situ synthesis method, including the carbothermal prereduction of WO3 and Co2O3 to remove all oxygen and a subsequent carbonization‐vacuum sintering process. The experimental results revealed that as the prereduction temperature increased from 1000 to 1200°C, the grain sizes of WC in WC–6Co and WC–12Co cemented carbides increased from .91 to 1.09 and .97 to 1.19 μm, respectively. Further, the fracture toughness of the sintered WC–6Co and WC–12Co cemented carbides increased from 9.97 to 10.83 and 11.11 to 18.30 MPa m1/2, respectively. In contrast, the hardness of the WC–6Co and WC–12Co cemented carbides decreased from 1477 to 1368 and 1351 to 1184 HV30, respectively. For a given prereduction temperature, an increase in Co content can improve the fracture toughness while lowering the hardness. In addition, an increase in the prereduction temperature or Co content led to an increase in the grain size of WC, which resulted in a transgranular fracture as the dominant mode.

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Section: Hardness and Fracture Toughnesscontrasting

confidence: 82%

Section: Resultsmentioning

confidence: 49%

Section: Resultsmentioning

confidence: 65%

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Effects of carbothermal prereduction temperature and Co content on mechanical properties of WC–Co cemented carbides

Deng

Kang

Zhang

2023

Int J Applied Ceramic Tech

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“…Minor shape changes in WC grains were also observed through the alloying of conventional WC-Co cemented carbides using Fe [ 34 , 35 ], Fe–Ni [ 28 , 29 , 36 , 37 , 38 , 39 ], Fe–Ni–Cr [ 40 , 41 ], Fe–Ni–Cr 3 C 2 [ 42 ], Re [ 43 ], Ni, Nb [ 44 ] and Ni–Al–W [ 45 ].…”

Section: Alloying Conventional Cobalt Binders Using Various Metalsmentioning

confidence: 99%

Faceting/Roughening of WC/Binder Interfaces in Cemented Carbides: A Review

Straumal

Konyashin

2023

Materials

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Hardmetals (or cemented carbides) were invented a hundred years ago and became one of the most important materials in engineering. The unique conjunction of fracture toughness, abrasion resistance and hardness makes WC-Co cemented carbides irreplaceable for numerous applications. As a rule, the WC crystallites in the sintered WC-Co hardmetals are perfectly faceted and possess a truncated trigonal prism shape. However, the so-called faceting–roughening phase transition can force the flat (faceted) surfaces or interfaces to become curved. In this review, we analyze how different factors can influence the (faceted) shape of WC crystallites in the cemented carbides. Among these factors are the modification of fabrication parameters of usual WC-Co cemented carbides; alloying of conventional cobalt binder using various metals; alloying of cobalt binder using nitrides, borides, carbides, silicides, oxides; and substitution of cobalt with other binders, including high entropy alloys (HEAs). The faceting–roughening phase transition of WC/binder interfaces and its influence on the properties of cemented carbides is also discussed. In particular, the increase in the hardness and fracture toughness of cemented carbides correlates with transition of WC crystallites from a faceted to a rounded shape.

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“…It can differ from the ideal trigonal prism and become additional facets [ 43 ]. After the alloying with ruthenium [ 44 , 45 ], vanadium [ 46 ], iron [ 22 , 47 ], rhenium [ 48 ], as well as after the addition of TaC nanoparticles [ 49 ], the WC facets also become rounded. In an extreme case, the WC crystallites completely lose their flat facets and obtain a spherical shape [ 50 ].…”

Section: Introductionmentioning

confidence: 99%

Topology of WC/Co Interfaces in Cemented Carbides

et al. 2023

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WC–Co cemented carbides build one of the important classes of metal matrix composites. We show in this paper that the use of machine vision methods makes it possible to obtain sufficiently informative statistical data on the topology of the interfaces between tungsten carbide grains (WC) and a cobalt matrix (Co). For the first time, the outlines of the regions of the cobalt binder were chosen as a tool for describing the structure of cemented carbides. Numerical processing of micrographs of cross sections of three WC–Co alloys, which differ in the average grain size, was carried out. The distribution density of the angles in the contours of cobalt “lakes” is bimodal. The peaks close to 110° (so-called outcoming angles) correspond to the contacts between the cobalt binder and the WC/WC grain boundaries. The peaks close to 240° (or incoming angles) correspond to the WC “capes” contacting the cobalt “lakes” and are determined by the angles between facets of WC crystallites. The distribution density of the linear dimensions of the regions of the cobalt binder, approximated with ellipses, were also obtained. The distribution density exponentially decreases with the lengths of the semi-axes of the ellipsoid, approximating the area of the cobalt binder. The possible connection between the obtained data on the shape of cobalt areas and the crack trajectories in cemented carbides is discussed.

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Strengthening mechanism of cemented carbide containing Re

Cited by 21 publications

References 42 publications

Effects of carbothermal prereduction temperature and Co content on mechanical properties of WC–Co cemented carbides

Effects of carbothermal prereduction temperature and Co content on mechanical properties of WC–Co cemented carbides

Faceting/Roughening of WC/Binder Interfaces in Cemented Carbides: A Review

Topology of WC/Co Interfaces in Cemented Carbides

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