Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue

Liang, X.Z. and Zhao, G.-H. and Owens, J. and Gong, P. and Rainforth, W.M. and Rivera-Díaz-del-Castillo, P.E.J. (2020) Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue. International Journal of Fatigue, 134. ISSN 0142-1123

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Abstract

A ball-on-rod RCF tester was employed to investigate the failure mechanisms of hydrogen-rich rolling components. The formation of defects, voids and surface cracks is significantly facilitated in hydrogen-rich bearing steels. In samples with RCF cycles of 1.6 × 107, the void density in hydrogen-rich samples is about three times that of hydrogen-free samples, whilst their crack length density four times that of hydrogen-free samples. This is due to a higher stress intensity factor around inclusions which is altered by hydrogen. Further characterisation confirms that grain boundaries are preferential sites for void formation and crack propagation.

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Fatigue
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2209
Subjects:
ID Code:
141649
Deposited By:
Deposited On:
20 Feb 2020 14:45
Refereed?:
Yes
Published?:
Published
Last Modified:
31 May 2020 06:33