中国铸造2009，Vol.6Issue(4)：300-304,5.
Influence of directional solidification variables on primary dendrite arm spacing of Ni-based superalloy DZ125
Influence of directional solidification variables on primary dendrite arm spacing of Ni-based superalloy DZ125
摘要
Abstract
The primary dendrite morphology and spacing of DZ125 superalloy have been observed during directional solidification under high thermal gradient about 500 K/cm. The results reveal that the primary dendrite arm spacing decreases from 94 μm to 35.8 μm with the increase of directional solidification cooling rate from 2.525 K/s to 36.4 K/s. The regression equation of the primary dendrite arm spacings λ1 versus cooling rate is λ1=0.013(GV)-0.32. The predictions of Kurz/Fisher model and Hunt/Lu model accord reasonably well with the experimental data. The influence of directional solidification rate under variable thermal gradient on the primary dendrite arm spacing has also been investigated.关键词
directional solidification/ thermal gradient/ cooling rate/ primary dendrite arm spacing/ superalloyKey words
directional solidification/ thermal gradient/ cooling rate/ primary dendrite arm spacing/ superalloy分类
矿业与冶金引用本文复制引用
Zhang Weiguo,Liu Lin,Huang Taiwen,Zhao Xinbao,Qu Min,Yu Zhuhuan,Fu Hengzhi..Influence of directional solidification variables on primary dendrite arm spacing of Ni-based superalloy DZ125[J].中国铸造,2009,6(4):300-304,5.基金项目
This project is financially supported by the National Natural Science Foundation of China (50771081, 50827102) and the National Basic Research Program of China (2006CB605202) （50771081, 50827102）
