Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 703, Issue -, Pages 389-395Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.01.335
Keywords
Superalloy Creep; Phase-field model; Dislocation dynamics; Microstructure
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SA2292/1-2, ZA171/7-1]
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The effect of initial dislocation density and external stress on primary creep of Nickel-based superalloys are studied by a combined continuum dislocation dynamics/phase-field model. This model can simultaneously predict the dislocation motion as well as the gamma/gamma ' evolution and yields macroscopic creep properties as a natural outcome-all of which are supported by experimental data. The rafting simulation results show that the initial dislocation density as well as the external stress can dramatically influence the aspect ratio of the gamma ' precipitates and the interface dislocation density at the gamma/gamma ' interfaces. In contrast, the plastic strain towards the end of primary creep is not sensitive to the initial dislocation density due to a seeming strain rate inversion during creep, and it is dependent on the applied external stress. (C) 2017 Elsevier B.V. All rights reserved.
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