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An approach was made to estimate the endurance limit in rolling contact fatigue in dependence of the operational conditions for the bearing steels M50 (AMS 6491), M50 NiL (AMS 6278) and the nitrogen-alloyed Cronidur 30 (AMS 5898) by investigating the changes in the residual stress profiles after 5 million cycles of overrolling. Real main shaft bearings with a pitch diameter of 168 mm have been tested. To simulate the heat generated in the turbine engines even under boundary operational conditions oil inlet temperatures between 80° and 210°C have been applied, the rotational speed has been varied between 2500 and 14000 r/min and the interference fit has been changed to produce different hoop stress levels.
rolling contact fatigue, heat resistant steel, residual stress, main shaft bearing, nitrogen-alloyed steel
Material scientist, FAG OEM & Handel AG, Schweinfurt,
Division head of the physical analysis department, Institut für Werkstofftechnik, Bremen,
FAG Aircraft/Super Precision Bearings GmbH, Schweinfurt,