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Research Article | Open Access

Post-testing measurement of freely movable and diffusible hydrogen in context of WEC formation at cylindrical roller thrust bearings from 100Cr6

Martin LINZMAYER1( ), Francisco GUTIÉRREZ GUZMÁN1, Gregor MANKE2, Georg JACOBS1, Christopher SOUS1, Michael POHL2
Institute for Machine Elements and System Engineering, RWTH Aachen University, Schinkelstrasse 10, Aachen 52062, Germany
Institute for Materials, Material Testing, Ruhr University Bochum, Universitätsstr 150, Bochum 44801, Germany
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Abstract

Sub-surface crack networks in areas of altered microstructure are a common cause for bearing failures. Due to its appearance under light microscopy, the damage pattern is referred to as White Etching Cracks (WEC). The root causes leading to the formation of WEC are still under debate. Nevertheless, it has already been shown that atomic hydrogen can have an accelerating effect on the formation and propagation of WEC. In addition to hydrogen pre-charging, hydrogen can be released and absorbed during rolling/sliding due to the decomposing of the lubricant and water. The current work focuses on the analysis of the hydrogen content of cylindrical roller thrust bearings after testing in a FE8 type test rig using two different lubricants. Within the framework of this work, two different hydrogen analysis methods were used and assessed regarding their applicability. The results show that the so-called Hydrogen Collecting Analysis (HCA) is more suitable to investigate the correlation between lubricant chemistry and hydrogen content in the test bearings than the Local Hydrogen Analysis (LHA). The measurements with the HCA show a continuously increasing freely movable and diffusible hydrogen content under tribological conditions, which leads to the formation of WEC. Comparative tests with an oil without hydrogen showed that the tendency of the system to fail as a result of WEC can be reduced by using a lubricant without hydride compounds.

Keywords

White Etching Crack (WEC)White Etching Areas (WEA)hydrogen contentHydrogen Collecting Analysis (HCA)freely movable hydrogendiffusible hydrogencylindrical roller thrust bearingroller bearingsroller contact fatigue

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Friction
Volume 9 Issue 4,
August 2021
Pages 876-890
DOI: 10.1007/s40544-020-0454-4
Cite this article:
LINZMAYER M, GUTIÉRREZ GUZMÁN F, MANKE G, et al. Post-testing measurement of freely movable and diffusible hydrogen in context of WEC formation at cylindrical roller thrust bearings from 100Cr6. Friction, 2021, 9(4): 876-890. https://doi.org/10.1007/s40544-020-0454-4

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Received: 17 January 2020
Revised: 11 August 2020
Accepted: 22 September 2020
Published: 01 December 2020
© The author(s) 2020

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