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
Contract: DE-FG02-09ER85590
Agency Tracking Number: 91039
Amount: $99,865.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: 32 c
Solicitation Number: DE-PS02-08ER08-34
Small Business Information
Multi-phase Services, Inc.
2111 RiverSound Dr., Knoxville, TN, 37922
DUNS: 876703971
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Ye Chou
 (865) 966-6878
Business Contact
 Robert Tien
Title: Dr.
Phone: (865) 966-6878
Research Institution
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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