Effect of Two-Step Sintering Process on Microstructure and Properties of Ultrafine-Grained WC-12%Co Cemented Carbides AITranslate

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Chinese Library Classification Number:TG135.5[一般工业技术]

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With the rapid development and industrial upgrading of the manufacturing industry,market demands for high efficiency,high quality and low cost of solid carbide cutting tools are continuously increasing.The performance improvement of ultrafine-grained cemented carbide rods,as the matrix material for solid carbide cutting tools,has attracted extensive attention.In this paper,based on the traditional liquidphase sintering process,ultrafine-grained WC-12%Co cemented carbide rods were designed and prepared via a two-step sintering process using WC as the matrix,Co as the binder phase,and Cr₃C₂ and VC as inhibitors.Through comparative experiments,the effects of the two-step sintering process and the traditional liquid-phase sintering process on the physical and mechanical properties,microstructure,and cutting performance of the alloy rods were systematically investigated.The difference between the two-step sintering process and the traditional liquid-phase sintering process lies in the special high-temperature stage procedure of“heating to sintering temperature-high-pressure controlled-speed cooling to eutectic temperaturereheating to sintering temperature for heat preservation”.This process optimization enables more sufficient dissolution and precipitation of WC,effectively improving the WC/Co interface bonding state and grain size distribution.Consequently,the alloy achieves a synergistic enhancement in fracture toughness and bending strength,with a significant improvement in the stability of bending strength.The solid carbide end mill made from the cemented carbide matrix prepared by the two-step sintering process exhibits significantly improved tool life when machining NAK80 plastic mold steel,with reduced micro-chipping failure and enhanced life stability.This study provides a process reference for the preparation of high-performance ultrafine-grained cemented carbides.