CCS and Power Systems
Crosscutting Research - Plant Optimization Technologies
Computational Design of Creep-Resistant Alloys and Experimental Validation in Ferritic Superalloys
Performer: University of Tennessee
Project No: FE0005868
In order to improve the thermal efficiency of steam turbines and reduce carbon dioxide emissions by fossil-energy power plants, steam temperatures and pressures in ultra-supercritical steam turbines must be increased to 760 degrees Celsius (°C) and 35 megapascals (MPa), respectively.
The elevated temperature results in the development of a critical issue related to the creep strength—or ability to withstand temperature and strain induced deformation leading to failure—of current ferritic steels. This project will address this issue by targeting the development of computational tools to design and optimize ferritic superalloys. These tools will be used to measure microstructural characteristics of selected alloys to quantify the links among materials processing, microstructures, material properties, and performance. The information generated through utilizing these tools will allow researchers to gain an understanding of creep behavior in these high-temperature alloys.
Figure 1. Dispersion of B2-NiAl-type precipitates in a bcc-Fe matrix (G. Ghosh, unpublished research, NU).