Influence of consolidation process and sintering temperature on microstructure and mechanical properties of near nano- and nano-structured WC-Co cemented carbides

Fabijanić, Tamara Aleksandrov; Alar, Željko; Ćorić, Danko

doi:10.1016/j.ijrmhm.2015.07.017

Cited by 51 publications

(23 citation statements)

References 8 publications

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“…The powders have an average grain size d BET in the range from 95 nm to 150 nm and a specific surface area (BET) in the range from 2.5 m 2 /g to 4.0 m 2 /g [13,14]. Grain growth inhibitors GGIs were added to the starting WC powders.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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Abstract:In this paper, the electrochemical corrosion resistance of near-nano and nanostructured WC-Co cemented carbides was investigated. WC powders with an average grain size d BET in the range from 95 nm to 150 nm and with an addition of vanadium carbide (VC) and chromium carbide Cr 3 C 2 as grain growth inhibitors were used as starting powders. The mixtures with 6 wt. % and 9 wt. % Co were consolidated by two different processes; sintering in hydrogen atmosphere and the sinter-HIP process. WC-Co samples were researched by direct current and alternating current techniques in the solution of 3.5% NaCl at room temperature. Corrosion parameters such as corrosion potential (E corr ), corrosion current density (j corr ) and polarization resistance (R p ) were determined by electrochemical techniques. From the conducted research, it was found that the consolidation processes and microstructural characteristics-grain growth inhibitors, grain size of the starting WC powders and η-phase-influenced the electrochemical corrosion resistance. η-phase enhanced the formation of a passive layer on the samples' surfaces, thereby reducing the tendency of the sample dissolution and increasing the stability of oxides forming therewith a passive layer on the sample surface.

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Section: Methodsmentioning

confidence: 99%

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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Section: Introductionmentioning

confidence: 99%

“…One of the biggest challenges of sintering ultrafine and nanoscaled powders is the retention of a small WC grain size in the sintered product [1,2]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…Continuous growth is characterized by uniform growth of WC grains, while discontinuous growth characterizes growth of isolated WC grains or groups of WC grains, which grow faster and larger compared to the surrounding grains [8][9][10]. Both growth processes must be avoided in order to obtain satisfactory properties in the sintered products since mechanical properties of ultrafine and nanostructured cemented carbides are directly dependent on the developed microstructure: WC grain size, mean free path of Co and contiguity of WC grains [2,10]. Homogeneous microstructure without grain growth and homogeneous distribution of cobalt between carbide grains lead to optimal strength and improvements of hardness and toughness, while microstructural irregularities, like porosity and especially abnormal grain growth, result in poor transverse rupture strength [11].…”

Section: Introductionmentioning

confidence: 99%

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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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Influence of consolidation process and sintering temperature on microstructure and mechanical properties of near nano- and nano-structured WC-Co cemented carbides

Cited by 51 publications

References 8 publications

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

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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