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Title:: Dynamic Response and Failure Characteristics of WC-Co Cemented Carbide Under Platform-Based Brazilian Splitting Test

Author(s):: ZHANG Jian; ZHANG Qinggui; XIN Hongmin; 1. Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle, Hubei University of Arts and Science, Xiangyang 441053, China 2. Key Laboratory of High Performance Manufacturing for Aero Engine, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi‘a(chǎn)n 710072, China 3. Hubei Chaozhuo Aviation Technology Co., Ltd., Xiangyang 441000, China

Keywords:: WC-Co cemented carbide; platform-based Brazil splitting; dynamic mechanical property; fracture mechanism

Abstract:: The dynamic platform-based Brazilian splitting experiments were designed in order to obtain the mechanical property and failure mechanism of WC-Co cemented carbide under dynamic tensile loading. Results show that the WC-Co cemented carbide has the typical elastic-brittle characteristic, and its failure strain increases slightly with the strain rates. The dynamic tensile strength of WC-Co cemented carbide increases with the strain rates under onedimensional stress wave loading, which indicates that the strain rate sensitivity of the composite has obvious positive correlation. The mechanism is consistent with typical ceramic materials, which is decided by subcritical propagation of typeI cracks. The microstructure characterizing results of recycled specimen show that the fracture mode of middle position of platform-based disc is mainly intergranular fracture, and forms dimple fracture by tensile stress. At the location near loading point, the fracture microstructure not only has the dimple fracture, but also has river-patterned cleavage fracture for individual grains under multi-directional stress effect. From macroscopical view, the WC-Co cemented carbide shows obvious brittle characteristics, but from microscopic view, local plastic deformation characteristics exists.