The influence of processing on microstructure and properties of iron aluminides

Conference · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:458958

Wright, R N; Wright, J K ^[1]

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1. Idaho National Engineering Lab., Idaho Falls, ID (United States)

An Fe-28%Al alloy containing 5% Cr has been synthesized by reaction of elemental powders, followed by consolidation using hot extrusion. The resulting material is fully dense, homogeneous, and has a grain size of less than 5{mu}m. Reaction synthesis results in an Al{sub 2}O{sub 3} dispersion that is uniformly dispersed during hot extrusion. Under some circumstances the hot extruded material undergoes secondary recrystallization, resulting in grain sizes greater than 25 millimeters. The fine grained material exhibits improved yield strength compared to the coarse grained material up to test temperatures of 800{degrees}C. Creep testing has shown that the coarse grained material has significantly improved time to rupture compared to fine grained material. The oxide dispersion strengthened material has significantly improved creep resistance compared to conventional powder metallurgy material. With proper heat treatment, the coarse grained material exhibits time to rupture of 425 hours at 650{degrees}C and a stress of 75 MPa, compared to 40 hours for conventional material of similar composition.

• Research Organization: Oak Ridge National Lab., TN (United States)
• OSTI ID: 458958
• Report Number(s): ORNL/FMP--96/1; CONF-9605167--; ON: DE97050349
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CREEP
EXTRUSION
IRON BASE ALLOYS
MICROSTRUCTURE
YIELD STRENGTH