Influence of yttrium and vacuum degree on the purification of K417 superalloy

被引：17

作者：

Bian, Wei-dong ^{[1
]}

Zhang, Hua-rui ^{[1
]}

Gao, Ming ^{[1
]}

Li, Qing-ling ^{[1
]}

Li, Jin-peng ^{[1
]}

Tao, Tong-xiang ^{[2
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Qingdao Inst New Mat Technol, Qingdao 266000, Peoples R China

来源：

VACUUM | 2018年 / 152卷

基金：

中国国家自然科学基金;

关键词：

Yttrium; Vacuum degree; Deoxidation; Denitrogenation; Y2O3; crucibles; Superalloy; CASTING PROCESS; MICROSTRUCTURE; ALLOY;

D O I：

10.1016/j.vacuum.2018.02.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

K417 superalloy castings with different addition of rare earth element Y were produced by vacuum induction melting technology using Y2O3 crucibles under different vacuum degrees. The effects and interaction mechanisms of Y and vacuum degree on the purification of the superalloy were investigated. The results showed that high purification of K417 superalloy with 4 similar to 5 ppm O and N was obtained after addition of Y. There was a characteristic transition during the deoxidation and denitrogenation of the superalloy when the vacuum degree changed. With the addition of 0.5 wt% Y in the alloy, the concentration of O could be reduced from 34 ppm to 8 ppm in rough vacuum and from 13 ppm to 4 ppm in high vacuum, respectively. High vacuum enhanced the chemical dissolution of Y2O3 crucible. The concentration of N decreased from 43 ppm to 14 ppm with the addition of Y in rough vacuum condition of 100Pa. Whereas, in high vacuum condition of 0.035Pa, the concentration of N tend to increase from 4 ppm to 7 ppm. The effect of deoxidation of Y promoted the process of denitrogenation. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：57 / 64

页数：8

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