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The effect of frequency on both the debris and the development of the tribologically transformed structure during fretting wear of a high strength steel

Kirk, Adam Matthew; Shipway, Philip H.; Sun, Wei; Bennett, Chris J.

Authors

Adam Matthew Kirk

Wei Sun



Abstract

It is well established that damage to the first bodies in fretting wear gives rise to a hard and brittle tribologically transformed structure (TTS) which can influence both wear and fatigue. While the existence and significance of TTS has been established through extensive study, the underlying physical mechanisms of its formation and their dependence on fretting conditions are still not clear. The aim of this work is to investigate the role of frequency in the evolution of tribologically transformed structures in a high strength steel subjected to fretting. In this work, fretting tests in the gross slip regime were conducted using self-mated high strength steel pairs employing a cylinder-on-flat geometry to produce a line contact, across a range of fretting frequencies. The nature of the debris (both particle size and composition) expelled from the fretting contact was not affected by the fretting frequency. Examination of worn specimens using SEM and EBSD was conducted to characterise the formation of TTS and to allow its role in the development of wear to be understood. It was found that at low frequencies, the fretting scar consisted of an oxide debris bed on top of a largely undeformed martensite sub-structure. However, at higher frequencies, the appearance of the sub-surface worn damage layer was very different, consisting of a debris oxide, a severely damaged / fragmented metallic layer and a plastically deformed martensitic sub-structure. A phenomenological model is presented (based upon the basic physical processes of oxide formation at the fretting surface and subsurface deformation below the contact) which accounts for the complex observations made.

Journal Article Type Article
Publication Date Apr 30, 2019
Journal Wear
Print ISSN 0043-1648
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 426-427
Issue Part A
Pages 694-703
APA6 Citation Kirk, A. M., Shipway, P. H., Sun, W., & Bennett, C. J. (2019). The effect of frequency on both the debris and the development of the tribologically transformed structure during fretting wear of a high strength steel. Wear, 426-427(Part A), 694-703. https://doi.org/10.1016/j.wear.2018.12.035
DOI https://doi.org/10.1016/j.wear.2018.12.035
Keywords fretting wear; TTS; debris; damage
Publisher URL https://www.sciencedirect.com/science/article/pii/S0043164818316016?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: The effect of frequency on both the debris and the development of the tribologically transformed structure during fretting wear of a high strength steel; Journal Title: Wear; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.wear.2018.12.035; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved.

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