Effect of V, Cr and Mn additions on the microstructure of WC–Co

Weidow, Jonathan; Norgren, Susanne; Andrén, Hans-Olof

doi:10.1016/j.ijrmhm.2009.02.002

Cited by 68 publications

(44 citation statements)

References 15 publications

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“…12. The V addition used is rather typical for WC grain growth inhibition, and a significantly smaller WC grain size was reported for this material compared with a reference straight WC-Co. 12 Using the THERMOCALC software 66 with appropriate databases, 21,46 the material's μ VC -T curve was calculated and is superposed on the interface diagram of Fig. 4.…”

Section: An Example Materialsmentioning

confidence: 79%

Section: An Example Materialsmentioning

confidence: 99%

“…4 to make predictions for a real V-doped WC-Co material, which was produced and investigated by Weidow et al 12,42 The composition of the material is given in Table I and details regarding its manufacture can be found in Ref. 12. The V addition used is rather typical for WC grain growth inhibition, and a significantly smaller WC grain size was reported for this material compared with a reference straight WC-Co. 12 Using the THERMOCALC software 66 with appropriate databases, 21,46 the material's μ VC -T curve was calculated and is superposed on the interface diagram of Fig.…”

Section: An Example Materialsmentioning

confidence: 99%

“…Apart from varying the relative W, C, and Co contents, adding various transition metals also influences the material's microstructure. 12,13 Much research has been aimed at producing cemented carbides with as small WC grain size as possible, down to the nanometer scale, as it has been speculated that such materials have excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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First-principles study of an interfacial phase diagram in the V-doped WC-Co system

Johansson

Wahnström

2012

Phys. Rev. B

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We present a method of determining an interfacial phase diagram using density functional theory calculations for interface energetics. Cluster expansions based on these calculations are used in Monte Carlo simulations to obtain configurational free energies. The method is applied to study the segregation of V to the WC(0001)/Co interface and to construct the corresponding interface diagram, a "complexion" phase diagram. By CALPHADtype analysis for the adjoining bulk phases, a connection with real materials is made. We find that, in equilibrium, the interface contains a thin V-rich film for a wide range of temperatures and chemical potentials of V corresponding to V additions below the (V,W)C x solubility limit. The results are compared with available experimental data, and implications of the strong segregation of V for the sintering process of V-doped WC-Co are discussed.

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Section: An Example Materialsmentioning

confidence: 79%

Section: An Example Materialsmentioning

confidence: 99%

Section: An Example Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First-principles study of an interfacial phase diagram in the V-doped WC-Co system

Johansson

Wahnström

2012

Phys. Rev. B

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“…Numerous attempts to achieve nanostructured cemented carbides have failed due to high sintering activity of WC nanopowders [2,3]. For that reason, the nano-and near nanopowders with very low sintering activity with respect to the re-crystallization during liquid phase sintering were developed [2,4]. Furthermore, powders with small amounts of the so-called grain growth inhibitors, GGIs, homogeneously distributed in powder mixtures, were used.…”

Section: Introductionmentioning

confidence: 99%

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

Fabijanić

Jakovljević

Franz

et al. 2016

Metals

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Abstract:The influence of grain growth inhibitors and powder size on the microstructure and mechanical properties of ultrafine and nanostructured cemented carbides was researched. Three different WC powders, with an addition of different type and content of grain growth inhibitors GGIs, VC and Cr 3 C 2 and with d BET grain sizes in the range from 95 to 150 nm were selected as starting powders. Four different mixtures with 6 and 9 wt. % Co were prepared. The consolidated samples are characterized by different microstructural and mechanical properties with respect to the characteristics of starting powders. Increased sintering temperatures led to microstructural irregularities in the form of a discontinuous WC growth, carbide agglomerates and abnormal grain growth as a consequence of coalescence via grain boundary elimination. The addition of 0.45% Cr 3 C 2 contributed to microstructure homogeneity, reduced discontinuous and continuous grain growth, and increased Vickers hardness by approximately 70 HV and fracture toughness by approximately 0.15 MN/m 3/2 . The reduction of the starting powder to a real nanosize of 95 nm resulted in lower densities, and significant hardness increase, with a simultaneously small increase in fracture toughness. The consolidation of real nanopowders (d BET < 100 nm) solely by conventional sintering in hydrogen without isostatic pressing is not preferred.

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Effect of V, Cr and Mn additions on the microstructure of WC–Co

Cited by 68 publications

References 15 publications

First-principles study of an interfacial phase diagram in the V-doped WC-Co system

First-principles study of an interfacial phase diagram in the V-doped WC-Co system

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

Tungsten Carbides

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