Development of ductile Fe{sub 3}Al-based aluminides
Iron aluminides based on Fe{sub 3}Al are of interest because of their excellent oxidation and corrosion resistance, especially in sulfur-bearing atmospheres. Work at ORNL has centered on developing Fe{sub 3}Al-based alloys with improved ambient temperature ductilities and increased strengths at temperatures of 600--700C. Ambient temperature brittleness in this system is not ``inherent,`` but is caused by atomic hydrogen which is produced by an environmental reaction between aluminum in the alloy and water vapor in the atmosphere. Great strides have been made in understanding this embrittlement Phenomenon, and the production of alloys with room temperature ductilities of over 10% and tensile yield strengths at 600C of as high as 500 MPa is now possible through modifications in alloy composition and control of thermomechanical processing techniques. Creep rupture lifes of over 200 h at 593C (1100{degrees}F) and 207 MPa (30 ksi) can also be produced through control of alloy composition and microstructure. This paper summarizes our present efforts to improve the tensile and creep rupture properties and gives the status of efforts to commercialize Fe{sub 3}Al-based alloy compositions.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10177540
- Report Number(s):
- CONF-9305135-8; ON: DE93017865
- Resource Relation:
- Conference: 7. annual conference on fossil energy materials,Oak Ridge, TN (United States),11-13 May 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
IRON BASE ALLOYS
MECHANICAL PROPERTIES
COMMERCIALIZATION
ALUMINIUM ALLOYS
INTERMETALLIC COMPOUNDS
TENSILE PROPERTIES
CREEP
RUPTURES
TEMPERATURE RANGE 0400-1000 K
THERMOMECHANICAL TREATMENTS
360103
290500
RESEARCH, DEVELOPMENT, DEMONSTRATION, AND COMMERCIALIZATION