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《POWDER METALLURGY TECHNOLOGY》 1995-01
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STUDY ON TESTING METHOD AND FRACTURE MODE OF WC-20(Fe/Co/Ni) CEMENTED CARBIDE

Tong Guoquan(Nanjing University of Aeronautics and Astronautics, Nanjing 210016 )Wang Erde; He Shaoyuan(Harbin Institute of Technology,Harbin 150006)  
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.
【CateGory Index】: TF125.3
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