CEMENTED CARBIDE AND CUTTING TOOL COMPRISING SAME AS BASE MATERIAL

• Main Authors: YAMANISHI, Takato, HAMAKI, Kensei, TSUDA, Keiichi
• Format: Patent
• Language: English; French; German
• Published: 19.01.2022
• Subjects: ALLOYS; BORING; CASTING; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TURNING; WORKING METALLIC POWDER

A cemented carbide includes a first hard phase and a binder phase. The first hard phase is composed of tungsten carbide grains. The binder phase includes cobalt and nickel as constituent elements. The binder phase further includes aluminum or chromium as a constituent element. An arbitrary surface or arbitrary cross section of the cemented carbide has: a region R1 interposed between an interface between the tungsten carbide grains and the binder phase and an imaginary line A indicating a location separated by 5 nm from the interface to the binder phase side; a region R2 interposed between the imaginary line A and an imaginary line B indicating a location separated by 20 nm from the interface to the binder phase side; and a region R3 other than the region R1 and the region R2 in the binder phase. When a line analysis is performed in a range including the region R1 and the region R3 adjacent to the region R1 with the region R2 being interposed between the region R3 and the region R1, a ratio C5/C20 of a maximum atomic concentration C5 at% of the cobalt in the region R1 and a maximum atomic concentration C20 at% of the cobalt in the region R3 is more than 1.