Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue
Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue
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.
Crack propagation, Hydrogen embrittlement, Rolling contact fatigue
Liang, X.Z.
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Zhao, G.H.
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Owens, J.
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Gong, P.
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Rainforth, W.M.
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Rivera-Díaz-del-Castillo, P.E.J.
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7 February 2020
Liang, X.Z.
a3a45c11-e85d-43e7-82a7-15192ec48bd2
Zhao, G.H.
bfc993db-ebd7-4a8d-b5fb-ec249dbb2214
Owens, J.
c7f133b1-81ad-4809-a11e-2e5e7903211c
Gong, P.
ce58ecd3-38ef-4054-a8e0-68da3f994c55
Rainforth, W.M.
7226983c-4ca1-4f0a-8191-02e3424dc98f
Rivera-Díaz-del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Liang, X.Z., Zhao, G.H., Owens, J., Gong, P., 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, [105485].
(doi:10.1016/j.ijfatigue.2020.105485).
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.
Text
1-s2.0-S0142112320300165-main
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Accepted/In Press date: 14 January 2020
e-pub ahead of print date: 21 January 2020
Published date: 7 February 2020
Keywords:
Crack propagation, Hydrogen embrittlement, Rolling contact fatigue
Identifiers
Local EPrints ID: 492256
URI: http://eprints.soton.ac.uk/id/eprint/492256
ISSN: 0142-1123
PURE UUID: 13f39806-bedc-40dc-b011-b15e99ef9b76
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Date deposited: 23 Jul 2024 16:34
Last modified: 24 Jul 2024 02:07
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Contributors
Author:
X.Z. Liang
Author:
G.H. Zhao
Author:
J. Owens
Author:
P. Gong
Author:
W.M. Rainforth
Author:
P.E.J. Rivera-Díaz-del-Castillo
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