About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
Energy Materials 2026
|
| Presentation Title |
Development of Low Thermal Expansion (CTE) Ni-Cr-Mo-Co Superalloys for 700°C Class Steam Turbine Plant |
| Author(s) |
Wu Hao, Pei Yubing, Gong Xiufang, Li Qingsong, Feng Baigang, Jiang Lei, Wang Changshuai |
| On-Site Speaker (Planned) |
Wu Hao |
| Abstract Scope |
“LTES 700” is a Ni-Cr-Mo-W superalloy with controlled low thermal expansion (CTE) that developed for 700°C class steam turbines, where its reduced CTE primarily attributes to designed high Mo, limited W amount and the formation of μ-Ni2(Mo,Cr,W) precipitates. However, the influence of Co on CTE and the associated strengthening mechanism in Ni-Cr-Mo-based systems remain insufficiently understood. This study investigated the effect of alloying elements on CTE and mechanical properties of Ni-Cr-Mo-Co superalloys. Experiment results show that Co slightly increased the CTE, but has a significant effect on the creep rate and stress rupture life, with improved creep properties linked to the reduction of stacking-fault energy in matrix caused by Co addition. The results are benchmarked against LTES 700 and LTES 700R, and the finding support the development of new material candidate for the 700°C A-USC steam turbines. |
| Proceedings Inclusion? |
Undecided |