Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044350 | Vacuum | 2018 | 38 Pages |
Abstract
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 4â¼5â¯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 0.5â¯wt% Y in the alloy, the concentration of O could be reduced from 34â¯ppm to 8â¯ppm in rough vacuum and from 13â¯ppm to 4â¯ppm in high vacuum, respectively. High vacuum enhanced the chemical dissolution of Y2O3 crucible. The concentration of N decreased from 43â¯ppm to 14â¯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 4â¯ppm to 7â¯ppm. The effect of deoxidation of Y promoted the process of denitrogenation.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Wei-dong Bian, Hua-rui Zhang, Ming Gao, Qing-ling Li, Jin-peng Li, Tong-xiang Tao, Hu Zhang,