MANUFACTURE OF SINTERED HIGH-SPEED STEEL CONTAINING DISPERSED TITANIUM COMPOUND

摘要

PURPOSE:To disperse more uniformly a titanium compound in a sintered body and to simplify the manufacture by combining a stage for mixing the titanium compound with a stage for blending it so as to finish mixing at a time. CONSTITUTION:Iron oxide powder, metallic oxide powder, metallic powder, alloy powder, carbon powder, titanium nitride powder and titanium carbonitride powder are prepd. as powdery starting materials. Among the materials the necessary materials including the iron oxide powder are reduced, and the materials are blended and mixed so as to provide the composition of high-speed contg. a prescribed titanium compound. The powdery mixture is reduced under heating in vacuum or an inert or reducing atmosphere to form reduced powder having the composition of high-speed steel contg. titanium nitride and/or titanium carbonitride. The reduced powder is press-molded to form a green compact, and sintered high-speed steel contg. a dispersed titanium compound is obtd. by sintering the green compact.