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。
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 ρof 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.
出处
《粉末冶金技术》
EI
CSCD
北大核心
1995年第1期38-43,共6页
Powder Metallurgy Technology
关键词
硬质合金
断裂韧性
测试技术
cemented carbide
fracture toughness
tasting technology
