Influence of MnS inclusion characteristics on generation of white etching cracks in 100Cr6 bearing steel
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Authors
Organisational units
External Organisational units
- Max-Planck-Institut für Eisenforschung GmbH
- Chalmers University of Technology
Abstract
Wind turbine gearbox (WTGB) bearings suffer from premature failures through white etching cracks (WECs). To investigate causes of this failure mechanism, we tested two types of 100Cr6 bearing steel components. We carried out rolling contact fatigue experiments on standard washers and material extracted from a WTGB bearing. These differed strongly in morphology and orientation of non-metallic inclusions (NMIs) with respect to the raceway, especially of MnS-type. While the standard washer did not exhibit WECs formation, the WTGB bearing did - even under moderate conditions (1.9 GPa Hertzian pressure, 10 7 cycles). We therefore conclude that MnS-inclusions are a key factor in initiation of WECs in WTGB bearings.
Details
Original language | English |
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Article number | 205129 |
Number of pages | 16 |
Journal | Wear |
Volume | 534-535.2023 |
Issue number | 15 December |
Early online date | 22 Sept 2023 |
DOIs | |
Publication status | Published - 15 Dec 2023 |