Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 3, Pages 553-558Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.08.023
Keywords
Thermomechanical fatigue; Deformation mechanisms; Recrystallization; Single crystal superalloy; Oxidation
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Funding
- Siemens Industrial Turbomachiney AB in Sweden
- Swedish National Energy Agency via the Research Consortium of Materials Technology for Thermal Energy Processes [KME-403]
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The deformation and damage mechanisms arising during thermomechanical fatigue of a high-Cr single crystal superalloy have been investigated and a completely new failure mechanism involving recrystallization and oxidation has been discovered. The primary deformation mechanism is slip along the {111} planes. The deformation is highly localized to a number of bands, where recrystallization eventually occurs during the thermomechanical fatigue process. When the final failure occurs along these recrystallized bands it is accompanied by the formation of voids due to the presence of grain boundaries. The damage process is further enhanced by oxidation, since recrystallization occurs more easily in the gamma' depleted zone under the oxide layer. (C) 2009 Elsevier B.V. All rights reserved.
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