WC-BASED CEMENTED CARBIDE CUTTING TOOL EXHIBITING EXCELLENT DEFECT RESISTANCE FOR HEAT-RESISTANT ALLOY CUTTING, AND SURFACE-COATED WC-BASED CEMENTED CARBIDE CUTTING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool that exhibits excellent defect resistance throughout a long period of use in a rolling cutting process for a heat-resistant alloy such as a Ni-based alloy or a Co-based alloy.;SOLUTION: In a WC-based cemented carbide cutting tool, the content of bonding phase component Co is 4 to 12 mass%, the content of bonding phase Re is 3 to 20 mass%, an Re enriched area is formed in the vicinity of the inner interface of a hard phase WC grain, and the enriched area is formed from the surface of the WC grain across an area having a depth that is 1% to 10% of the diameter of the WC grain. Further, average Re content in the area is 0.2 to 7 mass%, and, if necessary, cemented carbide components such as VC, Cr₃C₂, TiC, TaC, and NbC are included or a hard coating layer is formed on the surface of the cutting tool by vapor deposition.;COPYRIGHT: (C)2012,JPO&INPIT