Development of weldable high-strength iron aluminides

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:10154731

McKamey, C G; Zacharia, T; Maziasz, P J

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, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10154731
• Report Number(s): CONF-9205123--6; ON: DE92016018
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101
360102
360103
ALUMINIUM ALLOYS
CREEP
FABRICATION
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MOLYBDENUM
MOLYBDENUM ADDITIONS
NIOBIUM
NIOBIUM ADDITIONS
PREPARATION AND FABRICATION
STRUCTURE AND PHASE STUDIES
TENSILE PROPERTIES
WELDABILITY
ZIRCONIUM
ZIRCONIUM ADDITIONS