Journal
FRONTIERS OF MATERIALS SCIENCE
Volume 9, Issue 1, Pages 85-92Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11706-015-0277-9
Keywords
nickel-base superalloy; thermal fatigue; microstructure; crack
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Funding
- Research Award Fund for Outstanding Young and Middle-aged Scientists of Shandong Province in China [BS2011CL032]
- Taishan Scholars Project of Shandong [ts20110828]
- State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province
- Ministry of Science and Technology, Shandong University of Science and Technology [MDPC2013KF15]
- National Natural Science Foundation of China [51272141, 51208288]
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Effect of microstructures such as the distribution and shape of carbide and gamma' phase on thermal fatigue property of a superalloy was investigated experimentally. The resistance of thermal fatigue of the studied alloy decreases with the rising upper temperature. For the as-cast alloy, the thermal fatigue crack mostly origins from carbide at low upper temperature and results from oxidation at high upper temperature. The thermal fatigue crack of the heat treated alloy is mainly initiated by the oxidized cavity and then propagates through the join of the oxidized cavity. The orientation of crack propagation and direction of dendrite growth of alloy have the angle of 45A degrees. There is gamma' denuded region near the thermal fatigue crack because of oxidation.
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