2004 Volume 45 Issue 4 Pages 1391-1394
Superplasticity and cavitation were investigated for WC-Co cemented carbides with the different WC grain sizes of 5.2 μm (C.G.), 1.7 μm (M.G.) and 0.7 μm (F.G.) by tensile tests at 1473 K. The largest elongation of 212% was obtained not for the F.G. specimen, but for the M.G. specimen. Furthermore, the flow stress was lower, the m value was larger and cavity formation was less for the M.G. specimen than for the F.G. specimen. The low elongation for the F.G. specimen is because less WC grains contacted the Co phase. This points out the importance of the distribution of the Co phase for superplasticity of the cemented carbides.
