Influence of directional solidification variable on primary dendrite arm spacing of Ni-based superalloy DZ125

被引：0
|
作者：
Zhang Weiguo [1 ]
Liu Lin [1 ]
Huang Taiwen [1 ]
Zhao Xinbao [1 ]
Qu Min [1 ]
Yu Zhuhuan [1 ]
Fu Hengzhi [1 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
CHINA FOUNDRY | 2009年 / 6卷 / 04期
基金：
中国国家自然科学基金;
关键词：
directional solidification; thermal gradient; cooling rate; primary dendrite arm spacing; superalloy; ARRAY GROWTH; PB-SN; ALLOYS; STABILITY; CU;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
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 are spacing decreases from 94 mu m to 35.8 mu m 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 lambda(1) versus cooling rate is lambda(1)=0.013(GV)-0.32. The predicitions 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.
引用
收藏
页码：300 / 304
页数：5
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