Homogeneous Microstructure of Bulk K4169 Superalloy Obtained by Stable Undercooling

被引:0
|
作者
Zhang Keren [1 ,2 ]
Xie Faqin [1 ]
Hu Rui [2 ]
Li Jinshan [2 ]
Wu Xiangqing [1 ]
机构
[1] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
关键词
K4169; superalloy; undercooling; purification; temperature field; microstructure; homogeneity; RAPID SOLIDIFICATION; CU ALLOY; FE; IN718; REFINEMENT; GROWTH;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
By improving the method of B2O3 glass purification combined with cycle superheating based on traditional undercooling method, a stable undercooling above 200 K of 100 g bulk K4169 superalloy was obtained, and the largest undercooling went to 271 K. The effects of purification and superheating temperature on undercooling have been discussed. Moreover, the three-dimensional numerical analysis of temperature field inside the undercooled melt has been presented, and the maximum temperature deviation in different parts is only 14 K before nucleation. In contrast with the as-solidified microstructure, the grain size will increase with the increment of nucleating temperature. Generally, the difference of microstructure in 100 g undercooled K4169 superalloy is tiny and the average grain size of the superalloy with 271 K undercooling is 12 +/- 2 mu m.
引用
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页码:282 / 286
页数:5
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