Development of weldable high-strength iron aluminides

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5133728

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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5133728
• Report Number(s): CONF-9205123-6; ON: DE92016018
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CREEP
ELEMENTS
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MOLYBDENUM
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NIOBIUM
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
TENSILE PROPERTIES
TRANSITION ELEMENTS
WELDABILITY
ZIRCONIUM
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS