Tool damage of TiN coated cutting tools deposited by arc ion plating were investigated after turning of alloy 718.

Plastic deformation of the coating was observed at rake and flank face edges.

Fracture of the coating was caused from coating defects like droplet.

Oxidation and diffusion did not occur in the interface between the adhesive material and the TiN coating.

High temperature stability and lower defects of the coatings can reduce damage of the coated cutting tools.