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

页码：300 / 304

页数：5

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