Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 134, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105485
Keywords
Hydrogen embrittlement; Rolling contact fatigue; Crack propagation
Funding
- UK Engineering and Physical Science Research Council (EPSRC) [EP/L014742/1, EP/L025213/1]
- Royal Academy of Engineering [RCSRF1718/5/32]
- EPSRC [EP/M507817/2, EP/L014742/1] Funding Source: UKRI
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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 x 10(7), 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.
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