Rolling contact fatigue behavior of heat resistant bearing steels at high operational temperatures

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:316165

Boehmer, H J ^[1]; Hirsch, T ^[2]; Streit, E ^[3]

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1. FAG OEM and Handel AG, Schweinfurt (Germany)
2. Inst. fuer Werkstofftechnik, Bremen (Germany). Physical Analysis Dept.
3. FAG Aircraft/Super Precision Bearings GmbH, Schweinfurt (Germany)

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 2,500 and 14,000 r/min and the interference fit has been changed to produce different hoop stress levels.

• OSTI ID: 316165
• Report Number(s): CONF-9611259--; ISBN 0-8031-2421-X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
BEARINGS
FATIGUE
GAS TURBINE ENGINES
HEAT RESISTING ALLOYS
RAMJET ENGINES
RESIDUAL STRESSES
STEELS