Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 90, Issue -, Pages 61-70Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2014.04.009
Keywords
Single-crystal superalloy; Thermomechanical fatigue; Creep; Stress relaxation; Anisotropy; Parameter optimisation
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Funding
- Siemens Industrial Turbomachinery AB in Finspang, Sweden
- Swedish Energy Agency, via the Research Consortium of Materials Technology for Thermal Energy Processes [KME-502]
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The thermomechanical fatigue (TMF) stress relaxation of the single-crystal nickel-base superalloy MD2 has been analysed and modelled in this paper. In-phase and out-of-phase TMF experiments in the nominal [001], [011] and [111] crystal orientations have been performed. The TMF cycle consists of two loadings each with a 100 h long hold-time. A simple crystallographic creep model, based on Norton's creep law, has been developed and used in conjunction with a crystal plasticity model. The model takes anisotropy and tension/compression asymmetry into account, where the anisotropic behaviour is based on the crystallographic stress state. The values of the creep parameters in the anisotropic expression were determined by inverse modelling of the conducted TMF experiments, a parameter optimisation were performed. The developed model predicts the stress relaxation seen in the TMF experiments with good correlation. (C) 2014 Elsevier B. V. All rights reserved.
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