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Thermal desorption analysis of hydrogen in non-hydrogen-charged rolling contact fatigue-tested 100Cr6 steel

Thermal desorption analysis of hydrogen in non-hydrogen-charged rolling contact fatigue-tested 100Cr6 steel
Thermal desorption analysis of hydrogen in non-hydrogen-charged rolling contact fatigue-tested 100Cr6 steel

Hydrogen diffusion during rolling contact fatigue (RCF) is considered a potential root cause or accelerator of white etching cracks (WECs) in wind turbine gearbox bearing steels. Hydrogen entry into the bearing steel during operation is thought to occur either through the contact surface itself or through cracks that breach the contact surface, in both cases by the decomposition of lubricant through catalytic reactions and/or tribochemical reactions of water. Thermal desorption analysis (TDA) using two experimental set-ups has been used to measure the hydrogen concentration in non-hydrogen-charged bearings over increasing RCF test durations for the first time. TDA on both instruments revealed that hydrogen diffused into the rolling elements, increasing concentrations being measured for longer test durations, with numerous WECs having formed. On the other hand, across all test durations, negligible concentrations of hydrogen were measured in the raceways, and correspondingly no WECs formed. Evidence for a relationship between hydrogen concentration and either the formation or the acceleration of WECs is shown in the rollers, as WECs increased in number and severity with increasing test duration. It is assumed that hydrogen diffusion occurred at wear-induced nascent surfaces or areas of heterogeneous/patchy tribofilm, since most WECs did not breach the contact surface, and those that did only had very small crack volumes for entry of lubricant to have occurred.

Hydrogen diffusion, Rolling contact fatigue, Rolling element bearings, Thermal desorption analysis, White etching cracks, Wind turbine gearbox bearings
1023-8883
Richardson, A.D.
40eeca5e-4ca0-46a9-96a5-4050aae7c849
Evans, M.H.
516687bf-2909-4b2d-96ac-0748a845068f
Wang, L.
c50767b1-7474-4094-9b06-4fe64e9fe362
Wood, R.J.K.
0a258dd5-9409-4619-92bc-6ad02453a856
Ingram, M.
7f8e9d51-dad9-44d1-97b2-3c18894003f4
Richardson, A.D.
40eeca5e-4ca0-46a9-96a5-4050aae7c849
Evans, M.H.
516687bf-2909-4b2d-96ac-0748a845068f
Wang, L.
c50767b1-7474-4094-9b06-4fe64e9fe362
Wood, R.J.K.
0a258dd5-9409-4619-92bc-6ad02453a856
Ingram, M.
7f8e9d51-dad9-44d1-97b2-3c18894003f4

Richardson, A.D., Evans, M.H., Wang, L., Wood, R.J.K. and Ingram, M. (2018) Thermal desorption analysis of hydrogen in non-hydrogen-charged rolling contact fatigue-tested 100Cr6 steel. Tribology Letters, 66 (1). (doi:10.1007/s11249-017-0947-0).

Record type: Article

Abstract

Hydrogen diffusion during rolling contact fatigue (RCF) is considered a potential root cause or accelerator of white etching cracks (WECs) in wind turbine gearbox bearing steels. Hydrogen entry into the bearing steel during operation is thought to occur either through the contact surface itself or through cracks that breach the contact surface, in both cases by the decomposition of lubricant through catalytic reactions and/or tribochemical reactions of water. Thermal desorption analysis (TDA) using two experimental set-ups has been used to measure the hydrogen concentration in non-hydrogen-charged bearings over increasing RCF test durations for the first time. TDA on both instruments revealed that hydrogen diffused into the rolling elements, increasing concentrations being measured for longer test durations, with numerous WECs having formed. On the other hand, across all test durations, negligible concentrations of hydrogen were measured in the raceways, and correspondingly no WECs formed. Evidence for a relationship between hydrogen concentration and either the formation or the acceleration of WECs is shown in the rollers, as WECs increased in number and severity with increasing test duration. It is assumed that hydrogen diffusion occurred at wear-induced nascent surfaces or areas of heterogeneous/patchy tribofilm, since most WECs did not breach the contact surface, and those that did only had very small crack volumes for entry of lubricant to have occurred.

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More information

Accepted/In Press date: 30 October 2017
e-pub ahead of print date: 25 November 2017
Published date: 1 March 2018
Keywords: Hydrogen diffusion, Rolling contact fatigue, Rolling element bearings, Thermal desorption analysis, White etching cracks, Wind turbine gearbox bearings

Identifiers

Local EPrints ID: 417460
URI: https://eprints.soton.ac.uk/id/eprint/417460
ISSN: 1023-8883
PURE UUID: f1ce0b44-64a8-499a-a88c-5bf01a2b31fb
ORCID for L. Wang: ORCID iD orcid.org/0000-0002-2894-6784

Catalogue record

Date deposited: 31 Jan 2018 17:30
Last modified: 06 Oct 2018 00:36

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