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The effect of phase angle on crack growth mechanisms under thermo-mechanical fatigue loading

J. Jones, Mark Whittaker Orcid Logo, Robert Lancaster Orcid Logo, C. Hyde, J. Rouse, B. Engel, S. Pattison, S. Stekovic, C. Jackson, H.Y. Li

International Journal of Fatigue, Volume: 135, Start page: 105539

Swansea University Authors: Mark Whittaker Orcid Logo, Robert Lancaster Orcid Logo

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DOI (Published version): 10.1016/j.ijfatigue.2020.105539

Abstract

The current paper describes TMF crack growth behaviour in an advanced nickel-based superalloy. Changes in behaviour are examined which occur as a function of the phase angle between applied stress and temperature. The fractography of the failed specimens reveals changes from transgranular to intergr...

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Published in: International Journal of Fatigue
ISSN: 0142-1123 1879-3452
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53617
Abstract: The current paper describes TMF crack growth behaviour in an advanced nickel-based superalloy. Changes in behaviour are examined which occur as a function of the phase angle between applied stress and temperature. The fractography of the failed specimens reveals changes from transgranular to intergranular growth between high and low phase angle tests as a result of the onset of high temperature damage mechanisms. More targeted testing has also been undertaken to isolate the contributions of these mechanisms, with specific transitions in behaviour becoming clear in 90° diamond cycles, where dynamic crack growth and oxidation strongly interact.
Keywords: Thermo-mechanical fatigue; Phase angle; Creep; Oxidation
College: Faculty of Science and Engineering
Funders: This project has received funding from the European Union’s Horizon 2020 research and innovation programme and Joint Undertaking Clean Sky 2 under grant agreement No 686600. The authors are also grateful for the supply of material and input from Rolls-Royce plc.
Start Page: 105539

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