Semi-empirical model for predicting LAB and HAB formation in bearing steels

The formation of white etching bands (WEBs), including both low- (LAB) and high- (HAB) angle bands, in the subsurface steel bearings due to rolling contact fatigue (RCF) has been investigated over decades understand their characteristics predict during operation. A few studies recently have modelled development LABs theoretically based on thickening lenticular carbides adjacent band controlled by dislocation-assisted carbon migration. To date, no study reported HABs. Based percentage etched region formed bearings, this presents a semi-empirical model that predicts HABs for different pressures. LAB is compared with theoretical from literature experimental data. According this, new more realistically initiation than carbide model. This achieved involving ferrite (cellular elongated) shown as areas under optical images. Literature data used evaluate HAB models. growth pattern obtained provides strong evidence diffusion-based mechanism leading WEB formation.