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Phase transformations associated with micropitting in rolling/sliding contacts

Lookup NU author(s): Dr Adrian Oila, Professor Steve Bull

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Abstract

Metallographic investigation of the discs used in tests to simulate gear tooth contact has revealed the occurrence of several microstructural features that are present only in fatigued specimens: e.g. dark etching regions (DER) and white etching bands (WEB). In addition, a new type of microstructural constituent has been observed close to the surface, below asperities. This feature is referred to as the plastic deformation region (PDR). For the first time the hardness of these fatigue-induced phases was accurately determined by the nanoindentation technique. It has been found that DER initiates at the prior austenite grain boundaries. Fatigue cracks initiate and propagate preferentially at the boundaries of PDR and ultimately lead to the formation of micropitting. © 2005 Springer Science + Business Media, Inc.


Publication metadata

Author(s): Oila A, Bull SJ

Publication type: Article

Publication status: Published

Journal: Journal of Materials Science

Year: 2005

Volume: 40

Issue: 18

Pages: 4767-4774

Print publication date: 01/09/2005

ISSN (print): 0022-2461

ISSN (electronic): 1573-4803

Publisher: Springer

URL: http://dx.doi.org/10.1007/s10853-005-2017-5

DOI: 10.1007/s10853-005-2017-5


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