Influence of Steel Type on the Propensity for Tribochemical Wear in Boundary Lubrication with a Wind Turbine Gear Oil |
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Authors: | R D Evans G L Doll C H Hager J Y Howe |
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Affiliation: | (1) Timken Technology Center, North Canton, OH, USA;(2) Oak Ridge National Laboratory, Oak Ridge, TN, USA |
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Abstract: | Tribochemical wear may occur at the interface between a surface and a lubricant as a result of chemical and mechanical interactions
in a tribological contact. Understanding the onset of tribochemical wear damage on component surfaces requires the use of
high resolution techniques such as transmission electron microscopy (TEM). In this study, two steel types, case carburized
AISI 3310 and through-hardened AISI 52100, were wear tested using a ball-on-disk rolling/sliding contact tribometer in fully
formulated commercial wind turbine gearbox oil under boundary lubrication conditions with 10% slip. With the exception of
steel type, all other test conditions were held constant. Conventional tribofilm analysis in the wear tracks was performed
using X-ray photoelectron spectroscopy, and no significant composition differences were detected in the tribofilms for the
different steel disk types. However, TEM analysis revealed significant tribochemical wear differences between the two steel
types at multiple length scales, from the near-surface material microstructure (depth < 500 nm) to the tribofilm nanostructure.
Nanometer-scale interfacial cracking and surface particle detachment was observed for the AISI 52100 case, whereas the tribofilm/substrate
interface was abrupt and undamaged for the AISI 3310 case. Differences in tribofilm structure, including the location and
orientation of MoS2 single sheet inclusions, were observed as a function of steel type as well. It is suggested that the tribochemical wear modes
observed in these experiments may be origins of macroscopic surface-initiated damage such as micropitting in bearings and
gears. |
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