Patent ID: 10655230

Abstract:
A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, the coated cutting tool having a rake surface and a flank, in which the coating layer includes an α-type aluminum oxide layer, wherein: the α-type aluminum oxide layer has, on an opposite side to the substrate, a first interface, being the rake surface or a surface substantially parallel to the rake surface, a second interface, being the flank or a surface substantially parallel to the flank, and an intersecting edge between the first interface and the second interface; and a residual stress value (unit: GPa) measured near each of the first and second interfaces increases continuously or stepwise as a measurement position for the residual stress value becomes distant from the intersecting edge with distances of 10 μm, 50 μm, 100 μm, 150 μm and 200 μm.(In the above formulae, σ11 denotes a residual stress value (MPa) in a direction parallel to the intersecting edge, σ22 denotes a residual stress value (MPa) in a direction orthogonal to the intersecting edge, and each of the residual stress values is a value measured by a 2D method.)