Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 135, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105539
Keywords
Thermo-mechanical fatigue; Phase angle; Creep; Oxidation
Funding
- European Union's Horizon 2020 research and innovation programme and Joint Undertaking Clean Sky 2 [686600]
- RollsRoyce plc
- H2020 Societal Challenges Programme [686600] Funding Source: H2020 Societal Challenges Programme
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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 degrees diamond cycles, where dynamic crack growth and oxidation strongly interact.
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