Abstract: 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. 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; a region R2 interposed between the imaginary line A and an imaginary line B; and a region R3 other than the region R1 and R2. 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, a ratio C5/C20 of a maximum atomic concentration C5 at % of cobalt in the region R1 and a maximum atomic concentration C20 at % of cobalt in the region R3 is more than 1.

Abstract: A cutting tool is made of a cemented carbide including a first hard phase and a binder phase. The first hard phase is composed of WC particles. The binder phase contains Co and/or Ni. The cutting tool includes a main body part and a surface layer part. A thickness of the surface layer part is equal to or less than an average particle diameter of the first hard phase. On a surface of a plain part in a rake face, 1.0 GPa or more of a compressive residual stress is applied to the first hard phase. A ratio (B/A) of the average particle diameter (B) of the first hard phase on the surface of the plain part in the rake face to an average particle diameter (A) of the first hard phase on a cross section of the main body part is 0.7 or more and less than 1.

Abstract: Cemented carbide contains a first hard phase and a binder phase. The first hard phase is composed of tungsten carbide particles. The binder phase is composed of cobalt, nickel, iron, and copper as constituent elements. An average content of each of the constituent elements is not lower than 10 atomic % and not higher than 30 atomic %. Cemented carbide contains no second hard phase, or a content of the second hard phase is equal to or lower than 2 mass % of a total amount of cemented carbide. The second hard phase is composed of a compound containing at least one type of a metal element selected from the group consisting of a group-IV element, a group-V element, and a group-VI element in a periodic table except for tungsten and at least one type of an element selected from the group consisting of carbon, nitrogen, and oxygen.

Abstract: A base material according to an aspect of the present disclosure is made of a cemented carbide. The cemented carbide includes a first hard phase and a binder phase. The first hard phase consists of WC particles. The binder phase includes at least one element selected from Co and Ni. The base material includes a body portion, and a surface portion provided on a surface of the body portion. The surface portion has a thickness less than or equal to an average particle size in the first hard phase. A ratio (B/A) of an area proportion (B) of the binder phase in a surface of the surface portion to an area proportion (A) of the binder phase in a cross section of the body portion is not less than 1.2 and not more than 2.0.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: A cutting tool comprising a base material and a coating arranged on the base material; wherein: the coating comprises an ?-Al2O3 layer composed of a plurality of ?-Al2O3 particles; the average particle diameter a of the ?-Al2O3 particles in a first region of the ?-Al2O3 layer is 0.10 ?m or more and 0.30 ?m or less; the average particle diameter b of the ?-Al2O3 particles in a second region of the ?-Al2O3 layer is 0.30 ?m or more and 0.50 ?m or less; the average particle diameter c of the ?-Al2O3 particles in a third region of the ?-Al2O3 layer is 0.50 ?m or more and 1.50 ?m or less; and the ratio b/a is 1.5 or more and 5.0 or less.

Abstract: Cemented carbide contains a first hard phase and a binder phase. The first hard phase is composed of tungsten carbide particles. The binder phase is composed of cobalt, nickel, iron, and copper as constituent elements. An average content of each of the constituent elements is not lower than 10 atomic % and not higher than 30 atomic %. Cemented carbide contains no second hard phase, or a content of the second hard phase is equal to or lower than 2 mass % of a total amount of cemented carbide. The second hard phase is composed of a compound containing at least one type of a metal element selected from the group consisting of a group-IV element, a group-V element, and a group-VI element in a periodic table except for tungsten and at least one type of an element selected from the group consisting of carbon, nitrogen, and oxygen.

Abstract: 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. 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; a region R2 interposed between the imaginary line A and an imaginary line B; and a region R3 other than the region R1 and R2. 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, a ratio C5/C20 of a maximum atomic concentration C5 at % of cobalt in the region R1 and a maximum atomic concentration C20 at % of cobalt in the region R3 is more than 1.

Abstract: A cemented carbide includes a first hard phase, a second hard phase, and a binder phase, wherein the first hard phase is composed of tungsten carbide grains, the second hard phase is composed of carbide grains including niobium or tantalum as a constituent element, the binder phase includes cobalt, nickel, and chromium as constituent elements, at least part of the carbide grains further include tungsten as a constituent element, and when a volume ratio of the second hard phase to the cemented carbide is represented by A volume % and a volume ratio of a total of a niobium element and a tantalum element to the cemented carbide is represented by B volume %, a ratio A/B of A to B is more than 1.2.

Abstract: Provided is a cemented carbide including a first hard phase and a binder phase, the first hard phase consisting of WC, the binder phase being composed of either three elements which are Co, Ni and Cr or four elements which are Co, Ni, Cr and Mo, when a Co content is M1, a total content of Cr and Mo is M2, a total content of Ni, Cr, and Mo is M3, and a total content of Co, Ni, Cr, and Mo is M4, ratio M1/M4 being from 15 to 50%, ratio M2/M3 being from 15 to 40%, a ratio of an area of Cr/Mo-rich particles being lower than 1%, wherein the Cr/Mo-rich particles are particles constituting a region where a concentration of at least one of Cr and Mo is higher than the ratio of M1 to M4 in cross sectional elemental mapping of the cemented carbide.

Abstract: A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co. 70% or more of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride. The peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size ?, the peripheral portion has an average particle size ?, and ? and ? satisfy 1.1??/??1.7. The hard phase particles in the cermet have an average particle size of more than 1.0 ?m.

Abstract: A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co, and 70% or more (by number) of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride, and the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size ?, the peripheral portion has an average particle size ?, and ? and ? satisfy 1.1??/??1.7.

Abstract: A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co. 70% or more of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride. The peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr. The core has an average particle size ?, the peripheral portion has an average particle size ?, and ? and ? satisfy 1.1??/??1.7. The hard phase particles in the cermet have an average particle size of more than 1.0 ?m.

Abstract: A cermet contains hard phase particles containing Ti and a binding phase containing at least one of Ni and Co, and 70% or more (by number) of the hard phase particles have a cored structure containing a core and a peripheral portion around the core. The core is composed mainly of at least one of Ti carbide, Ti nitride, and Ti carbonitride, and the peripheral portion is composed mainly of a Ti composite compound containing Ti and at least one selected from W, Mo, Ta, Nb, and Cr, The core has an average particle size ?, the peripheral portion has an average particle size ?, and ? and ? satisfy 1.1??/??1.7.