期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 660, 期 -, 页码 159-165出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.11.082
关键词
Intermetallics; Crystal growth; Microstructure; Thermal analysis
资金
- National Nature Science Foundations of China [51371014, 51571008]
- China Postdoctoral Science foundation [2013M540037]
The effects of withdrawal rate (1-300 mu m/s) on microsegregation, solidification characteristic temperature, activation energy of melting and spatial orientation of a Re-containing Ni3Al based single crystal superalloy were investigated in this study. With increasing withdrawal rate, the as-cast microstructure changed from planar to cellular and then to dendritic, and accordingly the microsegregation degree firstly increased and then decreased. Meanwhile, with transforming the microstructure from cellular to dendritic, the activation energy of melting increased while the liquidus and solidus temperatures decreased, and sample with the severest microsegregation degree possessed the lowest liquidus temperature. In addition, the influence of orientation of the seed on the growth of single crystal became more significant with increasing withdrawal rate, and the spatial orientation of newly growth dendritic single crystal only strictly inherited that of seed at moderate withdrawal rates. (C) 2015 Elsevier B.V. All rights reserved.
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