| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5460761 | Journal of Alloys and Compounds | 2017 | 6 Pages |
Abstract
The influence of solidification history on unstressed long-term microstructure stability of TCP in completely heat-treated Mo-rich Ni3Al based single crystal superalloys with cellular and dendritic as-cast microstructures was studied by experimental analysis and the thermodynamic calculation (by JMatPro). High temperature solution treatment can completely eliminate microsegregation of alloying elements in both as-cast cellular and dendritic samples, whereas, the influence of as-cast microstructure (solidification history) on the composition of γ phase cannot be eliminated by solution treatment: Mo, Cr and Re contents of γ phases in as-cast and heat-treated dendritic samples were both higher than those in cellular samples. Meanwhile, as compared with heat-treated cellular sample, higher area fraction of TCP phase in heat-treated dendritic sample was due to higher supersaturation degree of γ phase, rather than the difference in the microsegregation behavior of alloying elements. Even so, TCP phases in both long-term aged cellular and dendritic samples were found to be Mo-, Cr- and Re-rich P phases with close compositions.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Cheng Ai, Shusuo Li, Xinbao Zhao, Jian Zhou, Yajie Guo, Zhiping Sun, Xuding Song, Shengkai Gong,