SURFACE-COATED CUTTING TOOL COMPRISING HARD COATING LAYER THAT EXHIBITS EXCELLENT CHIPPING RESISTANCE

摘要

The hard coating layer includes at least a complex nitride or complex carbonitride layer expressed by the composition formula (Ti 1-x Al x )(C y N 1-y ). The average Al content ratio x avg the average C content ratio y avg satisfy 0.60‰¤x avg ‰¤0.95 and 0‰¤y avg ‰¤0.005, respectively, each of the x avg and y avg is in atomic ratio. The crystal grains constituting the complex nitride or complex carbonitride layer include a crystal grain having the cubic structure. Predetermined average crystal grain misorientation and inclined angle distribution exist in the crystal grains having the cubic structure.