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<p>This study presents an effective strategy for fabricating plate-like WC–Co cemented carbides through plasma milling combined with controlled formation of carbon-deficient intermediate phases. Microstructural characterization revealed that plasma milling promoted W powder flattening and defect introduction, facilitating the formation of flake-shaped carbon-deficient phases (Co<sub>2</sub>W<sub>4</sub>C, Co<sub>3</sub>W<sub>9</sub>C<sub>4</sub>) which served as templates for plate-like WC growth. The alloy with 10&#xa0;wt% carbon compensation exhibited optimal comprehensive properties: Vickers hardness of 1418&#xa0;Kgf/mm<sup>2</sup>, fracture toughness of 14.0&#xa0;MPa·m<sup>1/2</sup> and transverse rupture strength of 3523&#xa0;MPa. The strengthening–toughening mechanism mainly originated from crack deflection&#xa0;and&#xa0;bridging induced by high-aspect-ratio WC grains and plastic dissipation in the Co binder, with an auxiliary contribution from locally observed low-angle WC/WC boundaries. This work not only clarifies the transformation pathway from platelet W to the plate-like carbon-deficient phase and then to plate-like WC, but also offers a novel microstructural design approach for plate-like WC–Co cemented carbides.</p>

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Plate-like WC–Co cemented carbides via plasma milling and carbon-deficient phases: microstructure and mechanical properties

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Qianchi Chen,
  • Hui Wang,
  • Weifeng Liu,
  • Zhongchen Lu

摘要

This study presents an effective strategy for fabricating plate-like WC–Co cemented carbides through plasma milling combined with controlled formation of carbon-deficient intermediate phases. Microstructural characterization revealed that plasma milling promoted W powder flattening and defect introduction, facilitating the formation of flake-shaped carbon-deficient phases (Co2W4C, Co3W9C4) which served as templates for plate-like WC growth. The alloy with 10 wt% carbon compensation exhibited optimal comprehensive properties: Vickers hardness of 1418 Kgf/mm2, fracture toughness of 14.0 MPa·m1/2 and transverse rupture strength of 3523 MPa. The strengthening–toughening mechanism mainly originated from crack deflection and bridging induced by high-aspect-ratio WC grains and plastic dissipation in the Co binder, with an auxiliary contribution from locally observed low-angle WC/WC boundaries. This work not only clarifies the transformation pathway from platelet W to the plate-like carbon-deficient phase and then to plate-like WC, but also offers a novel microstructural design approach for plate-like WC–Co cemented carbides.