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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.