Volume 37, Number 3, June 2019
|Page(s)||628 - 635|
|Published online||20 September 2019|
Effects of HfC Particles on Crack Initiation and Propagation Behavior of WC/Co Composites
School of Mechanical Engineering, Jinan University, Jinan 250022, China
Tungsten carbide composites were prepared by cold-pressing and hot-pressing sintering; fracture toughness and bending strength of the specimens were tested. The microstructures of HfC/WC/Co composites were observed with the SEM. The mathematical models were established to investigate the relationship between stress intensity factors of crack straight-through, crack deflection, and crack bifurcation with crack length, based on the crack propagation energy release rate. The simulation software ABAQUS was used to verify the four crack propagation methods of crack straight-through, crack deflection, crack bifurcation and crack pinning. The simulation results show that adding appropriate amount of HfC can effectively improve the fracture toughness and bending strength of the composites. The homogeneous distribution of HfC and Co in the matrix has a significant effect on the improvement of the strength and toughness of the composites, and the improvement mechanism is to disperse or transfer the stress at the crack tip to HfC by crack deflection, crack bifurcation, crack pinning, transcrystalline fracture, etc. As a result, the stress concentration at the crack tip in the matrix is reduced, and the toughness of the composites is improved.
Key words: ABAQUS / crack tips / HfC particle / crack propagation / energy release rate / toughening
关键字 : 碳化铪 / 裂纹扩展 / 能量释放率 / 增强增韧 / ABAQUS
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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