Abstract
Cutting performance for S48C of nitrogen-free TiC-10 vol%Mo2C-10 vol%Ni cermet (A-cermet) was mainly studied comparing with nitrogen contained TiC-20 vol%TiN-10 vol%Mo2C-10 vol%Ni cermet (B-cermet), in relation to their mechanical properties such as transverse-rupture strength, hardness from room temperature to 1000°C, creep resistance at 1050°C. Specimens having grain sizes of 2.5, 1.5 and 1.0 /μm were used in both cermets. It was found that, at low cutting speed (130 m/min), a coarse grained A-cermet was the most excellent in flank wear (VB) among both cermets with different grain size, and the VB value of A-cermet was always lower than B-cermet with the same grain size. On the other hand, at high cutting speed (250 m/min), VB of a fine grained A-cermet was excellent and nearly the same that of coarse grained B-cermet. As for the resistance to fracture, B-cermet seemed to be superior to A-cermet. A further study is needed to test whether the nitrogen contained cermet was really useful for cutting tool materials or not.
