Development of weldable high-strength iron aluminides
Using alloy development and thermomechanical processing techniques, Fe{sub 3}Al-based alloys with room temperature tensile ductilities of 10--20% and tensile yield strengths of 500 MPa at temperatures to 600{degrees}C have been developed at the Oak Ridge National Laboratory (ORNL). However, the high-temperature (above 500{degrees}C) creep-rupture properties of these alloys are not adequate for many applications. Studies at ORNL and at other laboratories have shown that binary Fe{sub 3}Al, which has very poor creep resistance ({approx} 2 h at 593{degrees}C and 207 MPa), can be strengthened by alloy additions. Recently, small additions of molybdenum, zirconium, and niobium were shown to produce strengthening through a combination of effects, including grain boundary strengthening, precipitation strengthening, increased recrystallization temperature, and control of dislocation nucleation and mobility. This paper describes our current efforts to develop an Fe{sub 3}Al-based alloy with improved high-temperature creep-rupture strength, while maintaining weldability and an acceptable room temperature tensile ductility of approximately 10%.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5133728
- Report Number(s):
- CONF-9205123-6; ON: DE92016018
- Resource Relation:
- Conference: 6. annual fossil energy materials conference, Oak Ridge, TN (United States), 12-14 May 1992
- Country of Publication:
- United States
- Language:
- English
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Development of iron aluminides
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Related Subjects
ALUMINIUM ALLOYS
FABRICATION
MECHANICAL PROPERTIES
TENSILE PROPERTIES
WELDABILITY
IRON BASE ALLOYS
MOLYBDENUM
METALLURGICAL EFFECTS
NIOBIUM
ZIRCONIUM
CREEP
MOLYBDENUM ADDITIONS
NIOBIUM ADDITIONS
ZIRCONIUM ADDITIONS
ALLOYS
ELEMENTS
IRON ALLOYS
METALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
TRANSITION ELEMENTS
ZIRCONIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication