Influence of alloying elements on hot corrosion resistance of nickel-based single crystal superalloys coated with Na2SO4 salt at 900 °C
oleh: Peng Song, Mingfeng Liu, Xiangwei Jiang, Yuchao Feng, Junjie Wu, Gong Zhang, Dong Wang, Jiasheng Dong, Xing-Qiu Chen, Langhong Lou
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2021-01-01 |
Deskripsi
Hot corrosion behavior of three nickel-based single crystal superalloys with different key alloying elements (including Re, Cr, Al and Ti) contents in molten Na2SO4 salt at 900 °C was investigated. Comparative study of hot corrosion resistance was conducted on two Re-free superalloys with 12 wt% Cr and different content of Al and Ti. By further adding Re, the experimental alloy with moderate Cr content (8.5 wt%) and Al/Ti > 1 in the present research also exhibited excellent hot corrosion resistance. The influence mechanism of Re on promoting hot corrosion resistance was attempted to be explored in combined with first-principle calculation. In addition, the potential design space of new-developed single crystal superalloys was also proposed.