Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 19, Pages 5866-5872Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.02.156
Keywords
High-temperature alloys; Crystal growth; Microstructure; Scanning electron microscopy
Categories
Funding
- National Natural Science Foundation of China [50931004, 50827102, 50771081]
- National Basic Research Program of China [2010CB631202, 2011CB610406]
- National High Technology Research and Development Program [2007AA03Z552]
- State Key Laboratory of Solidification Processing in NWPU
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The influence of elevated withdrawal rate on the microstructure and segregation behavior of Ni-base single-crystal superalloys containing Re and Ru is investigated. The experimental superalloys are processed under a high thermal gradient of approximately 250 K/cm and withdrawal rates between 10 and 500 mu m/s. With increasing withdrawal rate, the dendritic structures and gamma' precipitates in as-cast microstructures are apparently refined. Electron-probe microanalyzer (EPMA) results indicate that the degree of segregation for the constituent elements (e. g. Al, Ta, W, Re etc.) increases initially and then decreases with increasing withdrawal rate. In addition, the Re and Ru additions obviously increase the amounts of gamma-gamma' eutectic and the tendency of segregation for Al and Ta. (C) 2011 Elsevier B.V. All rights reserved.
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