WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

Straumal, Boris B.; Konyashin, I.

doi:10.3390/met13010171

Cited by 12 publications

(7 citation statements)

References 84 publications

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“…Vickers hardness does not change much. In the cemented carbides with various compositions, it can scatter between 1000 and 2200 HV [ 63 ]. However, the coercive force is the most sensitive to the structural features (since cobalt has ferromagnetic properties) [ 64 ].…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…Vickers hardness does not change much. In the cemented carbides with various compositions, it can scatter between 1000 and 2200 HV [63]. In Table 3, the bulk properties of the studied WC-Co alloys are given with different cobalt content and different grain size.…”

Section: The Length Distribution For Ellipse Semiaxesmentioning

confidence: 99%

Topology of WC/Co Interfaces in Cemented Carbides

et al. 2023

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“…Notably, what sets cemented carbides apart is their unique amalgamation of hardness and toughness, offering a competitive edge over alternative cutting materials such as diamond and high-speed steel. [1][2][3] During machining processes, cemented carbide tools are subjected to complex thermal-mechanical loads, leading to significant friction and wear. This wear adversely affects their performance and service life.…”

Section: Introductionmentioning

confidence: 99%

In-situ-growth of hard-coating, its impact on mechanical performances in cemented-carbides

Wu,

Gong,

et al. 2024

Surface Engineering

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This study focuses on preparing two types of cemented carbides: one with Ti elements and the other without, using a stepwise sintering process, primarily evaluating their mechanical properties. The research includes a thorough analysis of microstructure changes and post-wear surface alterations, coupled with assessments of phase composition, element content, relative density, surface hardness, fracture toughness, and wear properties. Results reveal that cemented carbides treated with in-situ surface modification under high-temperature nitrogen atmospheres exhibit exceptional densification. An in-situ hard-phases layer, predominantly TiN or Ti(C, N), is gradually grown on the surface of the WC-Co-Mo-TiNC cemented carbides, enhancing surface hardness and fracture toughness. This technology fortifies the material against indentation, crack expansion, and fracture, significantly improving wear resistance and extending service life. In essence, the in-situ surface modification technology, especially under high-temperature nitrogen atmospheres, emerges as a transformative approach, enhancing mechanical properties and substantially improving wear resistance for prolonged practical applications.

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“…The most common cutting materials used for their processing, especially in turning operations, are hard alloys or cemented carbides. The reason for this is their advantages in the field of physical, mechanical and cutting properties compared to other cutting materials, which makes hard alloys one of the most common products of powder metallurgy in the world [9,10]. Hard alloys consist of refractory metal carbides, nitrides or carbonitrides placed in a ductile metal bond.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic foundations of the rational cutting modes choice under conditions of machining

et al. 2023

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Durability and tribological tests of standard grades of high-speed steels and experimental single-carbide hard alloys with modified cobalt binder, created on the basis of the standard VK8 grade, under conditions of friction and turning of structural steels 45 and 12Х18Н10Т were carried out. The experiments were carried out for various cutting speeds and friction in order to determine the dependence of the optimal modes from the point of view of reducing the wear rate for cutting materials with different structural and thermodynamic characteristics. It has been experimentally established that high-speed steels with high values of thermal entropy have greater wear resistance in comparison with low-entropy grades, and cutting (sliding) speeds corresponding to minimal wear rates are higher for them. For experimental hard alloys grades characterized by greater thermal entropy values of the binder lower wear rates at optimal cutting speeds compared to the base alloy were also recorded; the values of the optimal cutting speeds for these materials are also higher. Thus, high-entropy cutting materials allow machining at higher speeds, while reducing the wear intensity.

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WC-Based Cemented Carbides with High Entropy Alloyed Binders: A Review

Cited by 12 publications

References 84 publications

Topology of WC/Co Interfaces in Cemented Carbides

Topology of WC/Co Interfaces in Cemented Carbides

In-situ-growth of hard-coating, its impact on mechanical performances in cemented-carbides

Thermodynamic foundations of the rational cutting modes choice under conditions of machining

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