Wear behavior of PVD and CVD coated carbide tools when face milling Inconel 718

The wear behavior of two types of coated cemented carbide tools has been st udied when face milling a nickel-based superalloy Inconel 718. PVD-TiN and CVD-TiCN+Al2O3 tools were used. It was found that the coatings were detache d after only five seconds of cutting. An attrition type wear mechanism asso ciated with workpiece material adhesion was observed which eventually led t o severe chipping, flaking, plastic deformation and cracking. It was noted that the coatings had no significant effect on tool performance under the c utting conditions tested.