Influence of MnS inclusion characteristics on generation of white etching cracks in 100Cr6 bearing steel

Kiranbabu Srikakulapu, Lutz Morsdorf, Ivan Gonzalez, Michael Kölling, Christian Broß, Dirk Ponge, Michael Herbig, David Mayweg

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


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.

Ausgabenummer15 December
Frühes Online-Datum22 Sept. 2023
PublikationsstatusVeröffentlicht - 15 Dez. 2023

Bibliographische Notiz

Funding Information:
The authors acknowledge the German Federal Ministry of Education and Research (BMBF) for funding through grant 03SF0535 . We thank Mr. Marti Lopez Freixes for assistance with the technical drawings.

Publisher Copyright:
© 2023 Elsevier B.V.

Dieses zitieren