1994 年 60 巻 1 号 p. 124-127
Micro-cracks were mechanically induced in the CVD coating layers on a cemented carbide tool. With decreasing mean value of distance between cracks from 200 μm to 20 μm, tensile residual stress in the coating decreased from 0.55 GPa to 0.05 GPa, the initiation time of thermal fatigue cracks in face milling became longer, and the chipping resistance in interrupted cutting tripled. It seems that the improvement of tool performance is closely related to the relief of tensile residual stress in the coating.