Effect of oscillation frequency on microstructure and properties of WC-Co cemented carbide prepared by hot oscillating pressing
Source abstract
Abstract
In this study, a novel hot oscillating pressing (HOP) was used to prepared WC-Co cemented carbides under various oscillation frequencies. The effects of sintering frequencies on the density, microstructure, and mechanical properties of cemented carbides were systematically investigated. The results show that applying a specific oscillation frequency during the sintering process can greatly aid in the densification process, improve the uniformity of microstructure, help the grain refinement, and prevent the formation of abnormally large WC grains. The mechanical properties of the alloys showed a noticeable improvement as the oscillation frequency increased. The hardness and fracture toughness of cemented carbides were not significantly improved when the oscillation frequency was ≥5 Hz, with the optimal values reaching 1913 kg/m 2 and 13.11 MPa.m 1/2, in turn. The improvement in mechanical properties of cemented carbide can be mainly attributed to higher density, grain refinement, microstructure uniformity and the increase of dislocation/twins caused by plastic deformation.
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