Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3

被引：0
作者：
Gao Sifeng [1 ]
Liu Lin [1 ]
Xu Yiku [1 ]
Yang Chubin [1 ]
Zhang Jun [1 ]
Fu Hengzhi [1 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
CHINA FOUNDRY | 2012年 / 9卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Ni-base superalloys; directional solidification; gamma' phase; dendritic spacing; DIRECTIONAL SOLIDIFICATION; MORPHOLOGY; EVOLUTION; GRADIENT; ALLOY; DZ125;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus. The experiments were performed under a thermal gradient of approximately 45 K.cm(-1) and at withdrawal rates ranging from 30 to 200 m.s(-1). The experimental results show that the primary and secondary dendritic arm spacings (PDAS and SDAS) decrease when the withdrawal rate is increased. Compared with the theoretical models of PDAS, the results are in good agreement with Trivedi's model. The relationships of PDAS and SDAS with withdrawal rates can be described as lambda(1) = 649.7V(-0.24 +/- 0.02) and lambda(2) = 281V(-0.32 +/- 0.03), respectively. In addition, the size of the gamma' phase significantly decreases with increasing withdrawal rate.
引用
收藏
页码：159 / 164
页数：6
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