Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5454708 | Materials Characterization | 2017 | 26 Pages |
Abstract
The solidification path of Ni-based single crystal superalloy with different Ru contents (0-4 wt%) was systematically investigated under planar and dendrite solid-liquid interface solidification conditions, aiming to reveal the evolution rule of solidification microstructure and selection mechanism of phases of the fourth generation single crystal superalloys. The results indicated that under plane solidification interface, the fine γ/γⲠeutectic structure started to form after the solidification of γ phase and then further developed the coarse γ/γⲠstructure. The solidification finally terminated with the formation of β-NiAl phase enveloped by coarse γⲠphase for Ru-free superalloy. However, when Ru was added in superalloy, the β-NiAl phase was firstly precipitated after the solidification of γ phase, and no fine γ/γⲠstructure connecting the γ phase with β-NiAl phase was found. Under the dendrite solid-liquid interface condition, the solidification path was consistent with that in the plane one. The evolution mechanism of solidification path with different Ru contents was discussed, which was helpful to optimize the alloy composition design.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Haifeng Wang, Haijun Su, Jun Zhang, Guomin Guomin, Yanbin Zhang, Quanzhao Yue, Lin Liu, Taiwen Huang, Wenchao Yang, Hengzhi Fu,