Constitutive model of an additively manufactured combustor material at high-temperature load conditions.

In this paper, the high-temperature constitutive behaviour of an additively manufactured ductile nickel-based superalloy is investigated and modelled, with application to thermomechanical fatigue, low-cycle fatigue and creep conditions at temperatures up to ${800^ \circ }$ 800 ∘ C. Thermomechanical fatigue tests have been performed on smooth specimens in both in-phase and out-of-phase conditions at a temperature range of $100 - {800^ \circ }$ 100 − 800 ∘ C, and creep tests at ${625^ \circ }$ 625 ∘ C, ${700^ \circ }$ 700 ∘ C, ${750^ \circ }$ 750 ∘ C and ${800^ \circ }$ 800 ∘ C. Additionally, low-cycle fatigue tests at different strain ranges and load ratios have been performed at ${700^ \circ }$ 700 ∘ C, and tensile tests have been performed at ${600^ \circ }$ 600 ∘ C, ${700^ \circ }$ 700 ∘ C and ${800^ \circ }$ 800 ∘ C. A clear anisotropic mechanical response is obtained in the experiments, where the anisotropic effects are larger at high stress levels in creep loadings. To capture this behaviour, a rate-dependent strain based on a double-Norton model has been adopted in the model, by which the creep and mid-life response of the thermomechanical fatigue tests can be simulated with good accuracy. [ABSTRACT FROM AUTHOR]