Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-461 - C7-464
DOI http://dx.doi.org/10.1051/jp4:1993773
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-461-C7-464

DOI: 10.1051/jp4:1993773

Thermomechanical processing and mechanical characteristics of particle-strengthened iron aluminide-based alloys

E. BATAWI1, J. PHILLIPS2, J.A. PETERS1 and G. EGGELER2

1  Sulzer-Innotec, Division 1511, Materials and Surface Engineering, 8404 Winterthur, Switzerland
2  Swiss Institute of Technology, Mechanical Metallurgy, Dept. Materials Science, 1015 Lausanne, Switzerland


Abstract
By the introduction of a fine dispersion of stable particles, a new family of chromium-containing iron aluminide-based alloys, has been developed. These alloys exhibited modified recrystallisation kinetics, creep and tensile strengths and welding characteristics. The existence of a second phase dispersion reduced the tendency for localised deformation. Uniform deformation was promoted and ductility improved. Dispersoid additions improved microstructural stability and the recrystallisation rate was retarded by more than a factor of two. The room temperature tensile ductility as well as the tensile strength of the particle-modified alloy were increased. Furthermore, the onset of micro void coalescence occurred at lower temperatures. At 700°C both alloys exhibited similar strain rate sensitivities. Charpy impact toughness tests showed that the ductile to brittle transition temperature for the thermomechanically treated alloys was approximately 250°C and about 50°C higher for the particle-containing alloy. This apparent decrease in impact toughness was attributed to large inclusions observed in the cast microstructure.



© EDP Sciences 1993