Semi-empirical model for predicting LAB and HAB formation in bearing steels
Semi-empirical model for predicting LAB and HAB formation in bearing steels
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DOI：
10.1016/j.ijfatigue.2021.106230
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发表时间：
2021-03-24
影响因子：
6
通讯作者：
Vierneusel, Bernd
中科院分区：
文献类型：
--
作者：
El Laithy, Mostafa;Wang, Ling;Vierneusel, Bernd
由于滚动接触疲劳（RCF），在钢轴承的表面下形成白色蚀刻带（WEBs），包括低（LAB）和高（HAB）角度带，已经研究了几十年，以了解它们的特性并预测它们在操作期间的形成。最近的一些研究模拟了LAB的发展，理论上基于增厚的透镜状碳化物附近的带控制的位错辅助碳迁移。迄今为止，还没有研究报告预测有害赤潮的形成。基于白色蚀刻区域形成的轴承的次表面的百分比，这项研究提出了一个半经验模型，预测形成的LAB和HAB在钢轴承不同的接触压力。LAB半经验模型进行了比较，从文献和实验数据的理论模型。据此，新模型比碳化物增厚模型更真实地预测了LABs的萌生。这是通过在光学图像下形成显示为白色区域的铁素体（蜂窝状和细长的）来实现的。文献数据已被用来评估LAB和HAB模型。在这项研究中获得的生长模式提供了强有力的证据，扩散为基础的机制，导致WEB的形成。
The formation of white etching bands (WEBs), including both low- (LAB) and high- (HAB) angle bands, in the subsurface of steel bearings due to rolling contact fatigue (RCF) has been investigated over decades to understand their characteristics and predict their formation during operation. A few studies recently have modelled the development of LABs theoretically based on thickening of lenticular carbides adjacent to the band controlled by dislocation-assisted carbon migration. To date, no study has been reported to predict the formation of HABs. Based on the percentage of white etched region formed in the subsurface of the bearings, this study presents a semi-empirical model that predicts the formation of both LABs and HABs in steel bearings for different contact pressures. The LAB semi-empirical model is compared with a theoretical model from literature and experimental data. According to this, the new model more realistically predicts the initiation of LABs than the carbide thickening model. This is achieved by involving the formation of ferrite (cellular and elongated) shown as white areas under optical images. Literature data have been used to evaluate the LAB and HAB models. The growth pattern obtained in this study provides strong evidence of a diffusion-based mechanism leading to WEB formation.