DENDRITE ARM SPACINGS AND MICROSEGREGATIONS IN <001> AND <011> ORIENTATED SINGLE CRYSTAL SUPERALLOYS DD407
YANG Chubin, LIU Lin, ZHAO Xinbao, LIU Gang, ZHANG Jun, FU Hengzhi
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072
Cite this article:
YANG Chubin LIU Lin ZHAO Xinbao LIU Gang ZHANG Jun FU Hengzhi. DENDRITE ARM SPACINGS AND MICROSEGREGATIONS IN <001> AND <011> ORIENTATED SINGLE CRYSTAL SUPERALLOYS DD407. Acta Metall Sin, 2011, 47(10): 1246-1250.
Abstract Single crystal superalloys DD407 with <001> and <011> orientations were produced with seeding technique by using the liquid metal cooling Bridgman furnace. The dendrite arm spacings (DAS) and microsegregations in the single crystal superalloys with <001> and <011> orientations were investigated. The results indicated that increasing the deviation angle from <001> orientation or decreasing the deviation angle from <011> would increase the dendrite arm spacing. In addition, DAS of single crystal grown along <011> orientation is obviously greater than that of <001> orientation for side–branching. EMPA results showed that the positive segregation elements Al, Ti and Ta enriched in the interdendritic region, and the negative segregation element W enriched in the dendrite core. The microsegregation in the single crystal with <011> orientation paralleled to the sample axis is the lightest. It is found that not only the DAS but the mechanism of dendrite evolution and arrayed pattern of dendrite affect the degree of microsegregation.
Supported by National Natural Science Foundation of China (Nos.50931004 and 50827102), National Basic Research Program of China (Nos.2010CB631202 and 2011CB610406), Research Fund of the State Key Laboratory of Solidification Processing (NWPU) of China (Nos.09–BZ–2010 and 57–TZ–2011)
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