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Pre-notched and corroded low cycle fatigue behaviour of a nickel based alloy for disc rotor applications

M. Dowd, K.M. Perkins, D.J. Child, Karen Perkins Orcid Logo, Mike Dowd

International Journal of Fatigue, Volume: 105, Pages: 7 - 15

Swansea University Authors: Karen Perkins Orcid Logo, Mike Dowd

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Abstract

Currently there is doubt surrounding the suitability of chemically-induced stress independent pre-conditioning of specimens to simulate turbine corrosion prior to fatigue testing. the thick oxide scales developed using such techniques can lead to net section loss and typically a lack of grain bounda...

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Published in: International Journal of Fatigue
ISSN: 01421123
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa34954
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Abstract: Currently there is doubt surrounding the suitability of chemically-induced stress independent pre-conditioning of specimens to simulate turbine corrosion prior to fatigue testing. the thick oxide scales developed using such techniques can lead to net section loss and typically a lack of grain boundary sulphide attack seen in components that experience stress. An alternative approach to a corrosion-fatigue test scenario is suggested by micro-notching fatigue specimens prior to low salt flux corrosion to form grain boundary sulphide particles within channel-like features akin to stress assisted morphologies. On fatigue testing, a trend was identified where a change of mechanism was observed. The grain boundary oxide likely formed in the wake of freshly precipitated sulphide particles fractures around segments of grains leading to a metal loss that contributes to a significant reduction in fatigue properties.
Keywords: corrosion; corrosion fatigue; environmental assisted fatigue; pitting corrosion; superalloys
College: College of Engineering
Start Page: 7
End Page: 15