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Plate-like WC–Co cemented carbides via plasma milling and carbon-deficient phases: microstructure and mechanical properties
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DOI：10.1007/s10853-026-13135-7.png)
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Abstract
En 中文
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.
Journal
IF:
3.9
Papers:
3.2W
Citations:
7.2W