The effects of cold rolling and subsequent heat treatment are reported for ingot cast-hot rolled andstrip cast iron aluminides (23 29 at.-%Al). Partially recrystallised microstructures obtained by hotrolling at 800℃ gave higher strength and elongation to fracture than hot rolling at 1000℃. Elongationincreased and proof strength decreased in proceeding from D0{sub}3 to mixed B{sub}2 + D0{sub}3and to B{sub}2 order as a result of heat treatment following cold rolling. Variability in the propertiesof strip cast material was associated with casting defects such as laps, but the best properties werecomparable with those of ingot processed material. The detrimental effects of tensile specimenpreparation by spark erosion are discussed.
展开▼
