To provide a surface-coated cutting tool having a hard coated layer that exhibits excellent superior chipping resistance in interrupted heavy-duty cutting.
In the surface-coated cutting tool, a hard coated layer including a CrN layer having an average layer thickness of 0.2-2 μm is formed on a tool base surface of WC-based cemented carbide by vapor deposition. In the surface-coated cutting tool, the CrN layer has a height equal to the average layer thickness and comprises oblong flat plate-shaped CrN crystal grains grown perpendicularly to the tool base surface. When a crystal grain structure in a horizontal cross-section at the depth of 0.1 μm from the surface of the CrN layer is observed, the area ratio of the oblong flat plate-shaped CrN crystal grains each having a short side of 5-100 nm and an aspect ratio of 3 or more is 30% or more of the total horizontal cross-sectional area.
TAKAOKA HIDEMITSU
Kazuo Tomita
Masayuki Miyake
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