Cutting wear, microstructure and mechanical properties of (Ti0.5,W0.5)C-based cermet inserts containing Mo2C

Abstract

(Ti0.5,W0.5)C-15wt%Co cermets containing Mo2C were prepared and used for cutting tool inserts. The microstructure and mechanical properties were characterized, and cutting wear was compared during machining VDEH 90CrSi5 alloy steel. Tool wear mechanism was analyzed by SEM and EDS. The Mo2C-added inserts possess refined ceramic grains and solid-solution strengthened binder, and further they have higher coercive force, hardness, fracture toughness, and transverse rupture strength. Owing to these factors, obvious superiority for them is displayed on the flank wear over non-Mo2C one in continuously machining VDEH 90CrSi5 alloy steel. It is also found that wearing of the inserts is the integrated results of abrasive wearing, adhesive wearing, oxidative wearing and diffusive wearing. After introducing Mo2C to the inserts, the abrasive wear resistance, adhesive wearing and diffusive wearing are all hindered effectively, still oxidative wearing is not reduced yet.