Abstract
The effects of additing vanadium carbide (VC) and/or titanium nitride (TiN) to sintered high speed steel tools are described. Results are presented for Al-8%Si alloy and Al-25%Si alloy in turning tests. Following conclusions are obtained.
(1) Wear resistance of the high speed steel tools increases with increase in the amount of VC and/or TiN.
(2) The improvement of wear resistance is due to hard VC or TiN particles which are resisting and remaining on the tool edge against the scratching by hard Si particles in the work materials.
(3) Addition of VC is more effective than that of TiN.
(4) The difference in wear resistance is ascribed to the difference in frictional characteristics or affinity between Si and VC or TiN.
(5) The addition of VC or TiN has no deficiency from the view points of cutting force, surface roughness and chip treatment.
