|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Modelling Microstructural Alterations in Bearing Steels under Rolling Contact Fatigue
||Hanwei Fu, Wenwen Song, Enrique I. Galindo-Nava, Pedro E. J. Rivera-Díaz-del-Castillo
|On-Site Speaker (Planned)
Bearings operate in severe environments reaching temperatures up to 100 celsius and cyclic loading up to a billion cycles. Although high-strength martensitic steels are typically used for bearings, subsurface-initiated rolling contact fatigue (RCF) cannot be avoided. Despite great efforts devoted from the 1940s on characterising microstructural transitions due to contact fatigue, their formation mechanisms remain unclear. Here, a unified novel theory is proposed to model three major such alterations in bearing steels: dark etching regions (DERs), white etching bands (WEBs) and white etching areas (WEAs). The models, for the first time, yield accurate predictions of formation, progress and corresponding mechanical properties evolution with respect to the number of cycles. High-resolution electron microscopy and atom probe tomography are also employed to validate the suggested mechanisms. The work presented here reduces the necessity of carrying out a large number of time-consuming endurance tests and is thus of great importance to bearing industry.
||Planned: Supplemental Proceedings volume