Strain-induced martensite decay in bearing steels under rolling contact fatigue: Modelling and atomic-scale characterisation
Strain-induced martensite decay in bearing steels under rolling contact fatigue: Modelling and atomic-scale characterisation
复制标题
DOI：
10.1016/j.actamat.2017.08.005
复制
发表时间：
2017-10-15
期刊：
影响因子：
9.4
通讯作者：
Rivera-Diaz-del-Castillo, Pedro E. J.
中科院分区：
文献类型：
--
作者：
Fu, Hanwei;Song, Wenwen;Rivera-Diaz-del-Castillo, Pedro E. J.
模拟了轴承钢在滚动接触疲劳（RCF）下表现为暗蚀区（DER）的马氏体衰退。该模型是基于位错辅助碳迁移机制建立的。所提出的模型是能够预测DER形成的进展和相应的机械性能的演变与循环次数的增加，在整个七十年的实验数据报告吻合得很好。研究了RCF试验条件对DER形成的影响，并开发了一种有用的工具DER%图，用于说明DER发生的温度、接触压力和循环次数。此外，进行了原子探针层析成像研究，揭示了DER铁氧体的性质，并获得有力的证据支持假设的DER形成机制。位错辅助碳迁移机制在DER形成中的成功应用为滚动接触疲劳下的马氏体衰退现象提供了合理的解释。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Martensite decay in bearing steels manifested as dark etching regions (DERs) under rolling contact fatigue (RCF) is modelled. The proposed model is established based on a dislocation-assisted carbon migration mechanism. The proposed model is capable of predicting the progress of DER formation and the corresponding mechanical property evolution with increasing number of cycles, in good agreement with the experimental data reported throughout seventy years. The effects of RCF testing conditions on DER formation are studied and a useful tool, DER% maps, is developed for illustrating the temperature, contact pressure and number of cycles for DER occurrence. Moreover, an atom probe tomography study is carried out, revealing the nature of DER ferrite and obtaining strong evidence supporting the postulated DER formation mechanism. The successful application of the dislocation assisted carbon migration mechanism to DER formation provides a plausible explanation to the phenomenon of martensite decay under rolling contact fatigue. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.