Abstract
The transverse-rupture strength and cutting performance of TiC coated cemented carbide were investigated as a function of thickness of β-free layer of substrate. The WC-β (N)-Co alloy (β(N) = (W, Ti, Ta) (C, N)) was used as the substrate.
The transverse-rupture strength of the coated alloy increased with increasing thickness of β-free layer, and it attained a constant value when the thickness was over about 15μm. On the other hand, the results of interrupted turning tests showed that the resistance to impact-failure was improved with increasing thickness. Discussions on the difference in the dependencies of the strength and cutting performance on the thickness of β-free layer were given.
