The effect of over-based calcium sulfonate detergent additives on white etching crack (WEC) formation in rolling contact fatigue tested 100Cr6 steel
The effect of over-based calcium sulfonate detergent additives on white etching crack (WEC) formation in rolling contact fatigue tested 100Cr6 steel
Over-based calcium sulfonate (OBCaSul) additives in oils are considered potentially critical in driving WEC formations, this ‘driving’ effect being unclear. Rolling contact fatigue testing of 100Cr6 steel using FE8 and PCS Micro-Pitting-Rig lubricated with oils containing varying OBCaSul concentrations have been conducted, tested samples being analysed using serial sectioning, Thermal desorption analysis (TDA) to measure hydrogen diffusion, and SEM/EDX of the tribofilms formed. Results show that OBCaSul concentration appears to affect WEC formation propensity, a reversal relationship of formations being shown between test rigs. Evidence shows oils containing OBCaSul form thick Ca dominated tribofilms, potentially promoting hydrogen diffusion and WEC formations in the FE8 rollers, where thinner Zn–S tribofilms on the FE8 raceways may demote hydrogen diffusion and WEC formations.
Additive chemistry, Hydrogen diffusion, Tribofilm analysis, White etching cracks
246-262
Richardson, A.D.
40eeca5e-4ca0-46a9-96a5-4050aae7c849
Evans, M.H.
516687bf-2909-4b2d-96ac-0748a845068f
Wang, L.
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Ingram, M.
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Rowland, Z.
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Llanos, G.
a78783fd-62ac-4c04-9a4b-57fad37f47ba
Wood, R.J.K.
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1 May 2019
Richardson, A.D.
40eeca5e-4ca0-46a9-96a5-4050aae7c849
Evans, M.H.
516687bf-2909-4b2d-96ac-0748a845068f
Wang, L.
c50767b1-7474-4094-9b06-4fe64e9fe362
Ingram, M.
7f8e9d51-dad9-44d1-97b2-3c18894003f4
Rowland, Z.
7fe1d725-f424-44df-bcfa-9f58326ef4d5
Llanos, G.
a78783fd-62ac-4c04-9a4b-57fad37f47ba
Wood, R.J.K.
dba41eaa-65e9-4d08-92b9-cd8706e42170
Richardson, A.D., Evans, M.H., Wang, L., Ingram, M., Rowland, Z., Llanos, G. and Wood, R.J.K.
(2019)
The effect of over-based calcium sulfonate detergent additives on white etching crack (WEC) formation in rolling contact fatigue tested 100Cr6 steel.
Tribology International, 133, .
(doi:10.1016/j.triboint.2019.01.005).
Abstract
Over-based calcium sulfonate (OBCaSul) additives in oils are considered potentially critical in driving WEC formations, this ‘driving’ effect being unclear. Rolling contact fatigue testing of 100Cr6 steel using FE8 and PCS Micro-Pitting-Rig lubricated with oils containing varying OBCaSul concentrations have been conducted, tested samples being analysed using serial sectioning, Thermal desorption analysis (TDA) to measure hydrogen diffusion, and SEM/EDX of the tribofilms formed. Results show that OBCaSul concentration appears to affect WEC formation propensity, a reversal relationship of formations being shown between test rigs. Evidence shows oils containing OBCaSul form thick Ca dominated tribofilms, potentially promoting hydrogen diffusion and WEC formations in the FE8 rollers, where thinner Zn–S tribofilms on the FE8 raceways may demote hydrogen diffusion and WEC formations.
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Accepted/In Press date: 4 January 2019
e-pub ahead of print date: 7 January 2019
Published date: 1 May 2019
Keywords:
Additive chemistry, Hydrogen diffusion, Tribofilm analysis, White etching cracks
Identifiers
Local EPrints ID: 429092
URI: http://eprints.soton.ac.uk/id/eprint/429092
ISSN: 0301-679X
PURE UUID: 6fe6e4ad-7720-44a6-a94f-cdf3d58a757e
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Date deposited: 20 Mar 2019 17:30
Last modified: 18 Mar 2024 05:21
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Author:
A.D. Richardson
Author:
M.H. Evans
Author:
M. Ingram
Author:
Z. Rowland
Author:
G. Llanos
Author:
R.J.K. Wood
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