Mechanical and Tribological Properties of PVD-Coated Cemented Carbide as Evaluated by a New Multipass Scratch-Testing Method

Table 4

Schematic illustrations summarizing the observed coating damage mechanisms during the circular multi-pass scratch testing.

	Region A (𝐹norm≤0.15, loads below the fatigue limit)
	Coating damage restricted to mild plastic deformation, minor cracking and wear caused by chipping or delamination.
	Coating properties of utmost importance.
	Region B1 (0.15≤𝐹norm≤0.20)
	Chipping and interfacial spalling at a high number of cycles (𝑁>1000) controlled by high cycle fatigue.
	Coating/interface properties of utmost importance.
	Region B2 (0.20≤𝐹norm≤0.25)
	Chipping and interfacial spalling at a high number of cycles (200<𝑁<1000) controlled by high cycle fatigue.
	Coating/interface properties of utmost importance.
	Region C (0.25≤𝐹norm≤0.60)
	Chipping and interfacial spalling at a relatively low number of cycles (10<𝑁<200) controlled by low cycle fatigue.
	Interface properties of utmost importance.
	Region D (𝐹norm≥0.60)
	Chipping and interfacial spalling due to elastic recovery caused by pronounced plastic deformation of the cemented carbide substrate.
	Interface/substrate material properties of utmost importance.