Plain bearing failure index

9.0 Incompatible Journal or Thrust Collar Material

Incompatible Journal or Thrust Collar Material Index


9.1 Failure of Bearings with Nitrided Steel Shaft

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	Failure of Bearings with Nitrided Steel Shaft
Main Characteristics	The bearing damage is in the form of sharp vee-shaped grooves pointing against the direction of rotation
Cause	The presence of hard particles loosely adhering to the nitrided surface.
Note
Possible Confusion with Other Types of Damage	Both dirt erosion (see Section 2: Wear) and cavitation erosion (see Section 4) produce arrow-shaped damage on the bearing surface; in these cases, however, the whole of the arrowhead has a matt appearance.
Comment	Nitrided steels should be cleaned and polished before being used as bearing surfaces.

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