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| SURFACE RECRYSTALLIZATION IN A Ni3Al BASE SINGLE CRYSTAL ALLOY IC6SX |
| LI Ya-Nan;;;Yafang HAN |
| 北京航空材料研究院 |
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Cite this article:
LI Ya-Nan; Yafang HAN. SURFACE RECRYSTALLIZATION IN A Ni3Al BASE SINGLE CRYSTAL ALLOY IC6SX. Acta Metall Sin, 2008, 44(4): 391-396 .
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Abstract The surface recrystallization in a Ni3Al base single crystal alloy IC6SX which is developed for advanced aeroengine turbine blades and vanes has been studied. The specimens were cold worked by grit blasting and then heat treated in the temperature range of 800-1260℃ for 1h to 10h. The experiment results showed that initial recrystallization nucleation temperature was about 1000℃ and the primal recrystallization completing temperature was between 1200-1210℃.It has been found that the recrystallization grain size increased significantly with increasing temperature. However, the thickness of recrystallization layer almost kept to be 10 μm in the temperature range of 1200-1240℃ for 1h, and increased fast with increasing temperature above 1240℃ i.e., the thickness of recrystallization layer was ～23μm after 1260℃/10h. The results indicated that different from the recrystallization behavior in most common Ni-base superalloys, the recrystallization grains in the interdendritic region grew faster than in the dendritic core. It was observed that a cellular transformation formed in the interface between recrystallization grain and the dendritic core.
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Received: 29 August 2007
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