TY - JOUR
T1 - Dendrite arm spacings and microsegregations in <001> and <011> orientated single crystal superalloys DD407
AU - Yang, Chubin
AU - Liu, Lin
AU - Zhao, Xinbao
AU - Liu, Gang
AU - Zhang, Jun
AU - Fu, Hengzhi
PY - 2011/10
Y1 - 2011/10
N2 - 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.
AB - 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.
KW - Crystallographic orientation
KW - Dendrite arm spacing
KW - Directional solidification
KW - Microsegregation
KW - Ni-based single crystal superalloy
UR - http://www.scopus.com/inward/record.url?scp=84855179241&partnerID=8YFLogxK
U2 - 10.3724/SP.J.1037.2011.00142
DO - 10.3724/SP.J.1037.2011.00142
M3 - 文章
AN - SCOPUS:84855179241
SN - 0412-1961
VL - 47
SP - 1246
EP - 1250
JO - Jinshu Xuebao/Acta Metallurgica Sinica
JF - Jinshu Xuebao/Acta Metallurgica Sinica
IS - 10
ER -