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An Empirical Approach to Correlating Thermo-Mechanical Fatigue Behaviour of a Polycrystalline Ni-Base Superalloy
Materials Research Centre, College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, UK
Rolls-Royce plc, Elton Road, Derby DE24 8BJ, UK
* Author to whom correspondence should be addressed.
Received: 31 October 2013; in revised form: 7 November 2013 / Accepted: 12 November 2013 / Published: 15 November 2013
Abstract: Assessment of thermo-mechanical fatigue behaviour of the polycrystalline nickel alloy RR1000 reveals a significant effect of phase angle on fatigue life. The current paper explores two scenarios: the first where the mechanical strain range is held constant and comparisons of the fatigue life are made for different phase angle tests; and secondly, the difference between the behaviour of In-phase (IP) and −180° Out-Of-Phase (OOP) tests over a variety of applied strain ranges. It is shown that different lifing approaches are currently required for the two scenarios, with a mean stress based approach being more applicable in the first case, whereas a Basquin-type model proves more applicable in the second. However, it is also demonstrated that the crack propagation phase should also be considered in these types of tests for high strain ranges and projects that future modelling approaches should attempt to unify mean stress, stress range and a crack propagation phase.
Keywords: thermo-mechanical fatigue; nickel superalloys; modelling; crack propagation
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Whittaker, M.; Lancaster, R.; Harrison, W.; Pretty, C.; Williams, S. An Empirical Approach to Correlating Thermo-Mechanical Fatigue Behaviour of a Polycrystalline Ni-Base Superalloy. Materials 2013, 6, 5275-5290.
Whittaker M, Lancaster R, Harrison W, Pretty C, Williams S. An Empirical Approach to Correlating Thermo-Mechanical Fatigue Behaviour of a Polycrystalline Ni-Base Superalloy. Materials. 2013; 6(11):5275-5290.
Whittaker, Mark; Lancaster, Robert; Harrison, William; Pretty, Christopher; Williams, Stephen. 2013. "An Empirical Approach to Correlating Thermo-Mechanical Fatigue Behaviour of a Polycrystalline Ni-Base Superalloy." Materials 6, no. 11: 5275-5290.