Alphabetical Index
Keyword Search

Casting Defects
Ingot Defects
Slab Defects

Drawing Defects
Forging Defects
Rolling Defects

Bearing Defects
Coating Defects
Corrosion Defects
Fractography
Heat Treatment Defects
Machining Defects
Other Defects
Pipeline Defects
Polishing Defects
Rail Defects
Tool Steel Defects
Welding Defects

Internal Defects
New Records
Surface Defects

Contact Us
Help
Home

Bluish or purplish discoloration on raceway surface - Bearing defects


Figure 1: Bluish or purplish discoloration on raceway surface.

Defect name: Discoloration
Record No.: 1429
Type of defect (Internal/Surface): Surface
Defect classification: Bearing defects
Steel name: Steel
Steel composition in weight %: No data.
Note:  
Damage conditions: Discoloration of cage, rolling elements, and raceway ring occurs due to a reaction with lubricant and high temperature.
Possible cause: Poor lubrication. Oil stain due to a reaction with lubricant. High temperature.
Measures: Improve the lubrication method.
Part: Inner ring of an angular contact ball bearing.
Symptom: Bluish or purplish discoloration on raceway surface.
Cause: Heat generation due to poor lubrication.
Reference: Not shown in this demonstration version.