Computer-aided development of ductile ferritic steels with high strengths for ultra-supercritical steam-turbine applications

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$99,865.00
Award Year:
2009
Program:
SBIR
Phase:
Phase I
Contract:
DE-FG02-09ER85590
Award Id:
94556
Agency Tracking Number:
91039
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
2111 RiverSound Dr., Knoxville, TN, 37922
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
876703971
Principal Investigator:
Ye Chou
Dr.
(865) 966-6878
ytchou@uci.edu
Business Contact:
Robert Tien
Dr.
(865) 966-6878
robert_t_77014@yahoo.com
Research Institution:
n/a
Abstract
The efficiency of the conventional fossil-power plant can be improved by increasing the steam temperature and pressure. The DOE is targeting an increase of the steam temperature from 593°C to 677°C by the year 2010 and to 760°C by 2020. Currently, ferritic steels are used at temperatures below 620°C for fossil-energy conversion systems, but these materials exhibit limited creep resistance at higher temperatures. Although Fe-Al-Ni-Cr-based alloys can provide the required creep resistance, these materials are limited by poor ductility and cleavage fracture at ambient temperature. This project will develop a new type of ductile ferritic steels with a tensile ductility of 10% ~ 15% at ambient temperature, without sacrificing the creep resistance. In Phase I, the ductility of the quaternary Fe-Al-Ni-Cr system will be determined as a function of the alloy composition, the amount of the B2 phase, and the elemental partitioning in the B2 and body centered cubic matrix phases. The study will employ (1) thermodynamic calculations to identify potential alloy compositions that have good ductility; (2) microstructural characterizations using transmission-electron microscopy, analytical-electron microscopy, and scanning-electron microscopy to verify the thermodynamic calculations; and (3) mechanical-property experiments to optimize the alloy composition. Commercial Applications and other Benefits as described by the awardee: The new type of aluminide-strengthened ferritic steels should find use in steam-turbine components operating at temperatures higher than 700°C, leading to a significant capital cost reduction and increased thermal efficiency for steam turbines.

* information listed above is at the time of submission.

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