Modelling dislocation assisted tempering during rolling contact fatigue in bearing steels

Kang, Jee Hyun and Hosseinkhani, Babak and Vegter, Reinder H. and Rivera-Díaz-Del-Castillo, Pedro E.J. (2015) Modelling dislocation assisted tempering during rolling contact fatigue in bearing steels. International Journal of Fatigue, 75. pp. 115-125. ISSN 0142-1123

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Abstract

Rolling contact fatigue in bearing steels is manifested by dark-etching regions, which are attributed to deformation induced tempering. In order to quantitatively explain this phenomenon, a model is suggested for martensite tempering assisted by dislocation glide during rolling contact fatigue. In the model, dislocations transport carbon from the matrix to carbide particles, provided that the carbon is located at a certain distance range from the dislocation contributing to the tempering process. By calculating the amount of carbon in the matrix, the kinetics of carbide thickening and hardness reduction are computed. It is found that the dark-etching region kinetics can be controlled by both bearing operation conditions (temperature and deformation rate) and microstructure (type, size, and volume fraction of carbides). The model is validated against tested bearings, and its limitations are discussed.

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Fatigue
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2209
Subjects:
ID Code:
125579
Deposited By:
Deposited On:
25 May 2018 13:30
Refereed?:
Yes
Published?:
Published
Last Modified:
30 Sep 2020 07:49