Research Article
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 (, 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 () | Chipping and interfacial spalling at a high number of cycles () controlled by high cycle fatigue. | Coating/interface properties of utmost importance. | Region B2 () | Chipping and interfacial spalling at a high number of cycles () controlled by high cycle fatigue. | Coating/interface properties of utmost importance. | Region C ( | Chipping and interfacial spalling at a relatively low number of cycles () controlled by low cycle fatigue. | Interface properties of utmost importance. | Region D () | 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. |
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