Microstructure and Stress-Rupture Property of Large-Scale Complex Nickel-Based Single Crystal Casting

The microstructure and stress-rupture property of the large-scale complex single crystal (SX) casting DD10 were investigated in high-rate solidification process. It is found that the primary dendrite arm spacing (PDAS) does not increase monotonically with the height increase. When across the platfor...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2018-08, Vol.31 (8), p.887-896
Main Authors: Huang, Min, Zhang, Gong, Wang, Dong, Dong, Jia-Sheng, Wang, Li, Lou, Lang-Hong
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engines
Eutectics
Gas turbines
Heat treating
Heat treatment
Materials Science
Metallic Materials
Microscopy
Microstructure
Nanotechnology
Organometallic Chemistry
Single crystals
Solidification
Spectroscopy/Spectrometry
Temperature
Tribology
Turbines
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Summary:The microstructure and stress-rupture property of the large-scale complex single crystal (SX) casting DD10 were investigated in high-rate solidification process. It is found that the primary dendrite arm spacing (PDAS) does not increase monotonically with the height increase. When across the platform, the temperature gradient increases due to the effect of platform, and the corresponding PDAS decreases. The distribution of eutectic volume fraction in large-scale complex SX casting is affected by PDAS, solid back diffusion, and the development of high order dendrites. The eutectic volume fraction contained in the sample taken below the platform decreases with the height increase. While the eutectic volume fraction contained in the sample taken upper the platform increases gradually with the height increase. After heat treatment, most of the γ / γ′ eutectics are eliminated and the components are distributed uniformly. The similar stress rupture properties of the samples at different heights in the same direction are obtained.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-018-0716-6