Cemented carbide and cutting tool

Abstract

A cemented carbide including a hard phase, a binding phase, and inevitable impurities. The hard phase satisfies a first hard phase composed mainly of tungsten carbide, and a second hard phase composed mainly of a compound. The compound contains multiple types of metallic elements including tungsten and at least one element selected from carbon, nitrogen, oxygen, and boron. The second hard phase satisfies D10/D90<0.4, wherein D10 denotes a cumulative 10% grain size in an area-based grain size distribution on a surface or cross section of the cemented carbide, and D90 denotes a cumulative 90% grain size in the area-based grain size distribution, and satisfies σ<5.0, wherein σdenotes the variance of the distance between the centroids of the nearest two of the second hard phases. The average grain size Dof the first hard phase ranges from 0.8 to 4.0 μm and satisfies D/D<1.0, wherein Ddenotes the average grain size of the second hard phase.