STUDY ON TESTING METHOD AND FRACTURE MODE OF WC-20(Fe/Co/Ni) CEMENTED CARBIDE
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摘要: 用电火花加工的单边缺口试样,外推得到WC-20(Fe/Co/Ni)硬质合金的平面应变断裂韧性KIc,发现表观裂纹扩展能量释放率GQ(ρ)与试样缺口根部曲率半径ρ呈线性关系,即GQ(ρ)=GIC+Aρ。在扫描电镜下观察断口形貌,认为有4种断裂模式:粘结相撕裂、WC晶粒解理断裂、WC-WC晶界开裂和WC-粘结相边界开裂,讨论了各种断裂模式的断裂过程。Abstract: The plane strain fracture toughness KIC of WC-20 (Fe/Co/Ni) cemented carbides was obtained on single-edge notched specimen machined by electric discharge usiny extrapolation. The results showed a linear correlation between appearance strain energy release rate GQ(ρ) and curvature radius ρ of the specimen notch, i. e. GQ(ρ)=GIC +Aρ. By observation of fracture morphology using scanning electionic microscope, 4 kinds of fracture modes were considered:ductile rupture in binder phase,WC grain cleavage,intergranular fracturee along WC grain boundary and fracture near the interface of WC/binder. The fracture process of various fracture modes has been discussed.
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Key words:
- cemented carbide /
- fracture toughness /
- tasting technology
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