Wear tracks - Hard Cr coating

Wear tracks - Hard Cr coating - Coating defects

Figure 1: Wear tracks after sliding distance of 200 m, normal load value of 30 N and sliding speed of 1 ms-1 (a) without coating; (b) hard Cr coating.

Defect name: No data.
Record No.: 2943
Type of defect (Internal/Surface): Surface
Defect classification: Coating defects
Steel name: Steel
Steel composition in weight %: No data.
Note: Primarily we should say that adhesive wear occurs when the contact pressure between sliding surfaces is high enough to cause local plastic deformation and welding between the contacting asperities. Abrasive wear, however, occurs between two hard sliding surfaces when hard debris particles are indented and make grooves in the sliding surface of the material. Both kinds of wear can be lessened by either a decrease on the contact pressure or an increase in the mechanical strength of the material itself. Fig. 1 presents wear tracks of tested samples in the conditions without lubrication and after sliding road of 200 m. Displayed tracks in Fig. 1 are created in condition of the highest sliding speeds and maximum normal load in this test. Based on the appearance of wear tracks, we can conclude that the dominant wear mechanism is abrasive wear.
Reference: Not shown in this demonstration version.