EFFECT OF PROCESS VARIABLES ON TENSILE PROPERTIES OF INGOT PROCESSED VERSUS STRIP CAST-IRON ALUMINIDES

The effects of cold selling and subsequent heat treatment are reported for ingot cast-hot rolled and strip cast iron aluminides (23-29 at.-% Al). Partially recrystallised microstructures obtained by hot rolling at 800 degrees C gave higher strength and elongation to fracture than hot rolling at 1000 degrees C. Elongation increased and proof strength decreased in proceeding from D0(3) to mixed B2 + D0(3) and to B2 orde r as a result of heat treatment following cold rolling. Variability in the properties of strip cast material was associated with casting def ects such as laps, but the best properties were comparable with those of ingot processed material. The detrimental effects of tensile specim en preparation by spark erosion ave discussed. MST/3866.