Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 605, Issue -, Pages 253-259Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.03.060
Keywords
Nickel base superalloy; Twinning; Electron microscopy; Fatigue; Fracture
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Funding
- National Natural Science Foundation of China [50971078, 51071096, 51271097]
- Shandong Province [ZR2010EM009]
- China Postdoctoral Science Foundation (special grade) [201003630]
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The thermomechanical fatigue performances of two superalloys, TMS-82+ and TMS-196, were comparatively studied. The stress relaxation during the hold period and the plastic deformation in TMS-196 were both less than those in TMS-82+. The microstructural evolution was observed using scanning electron microscope and transmission electron microscope. It was found that numerous thin twins were formed during the tests in TMS-196, while in TMS-82+, few thick twins were developed. Moreover, the fracture surface of TMS-82+ is relatively flat, whereas the fracture surface of TMS-196 is rather rough. This difference was attributed to their different twin morphologies. Given their different compositions and properties, this research may provide useful guidance for the further development of superalloy. (C) 2014 Elsevier B.V. All rights reserved.
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