冷間圧延後に温間非対称速圧延を施したオーステナイト系ステンレス鋼板の再結晶集合組織

Abstract

A {111} texture leads to good deep drawability but does not generally develop in face-centered cubic metals. One of the authors previously succeeded in {111} recrystallization texture evolution by cold rolling, asymmetric warm rolling and subsequent solution treatment for Al-Mg-Si alloy sheets. In this study, rolling and recrystallization textures of austenitic stainless steel with low stacking fault energy have been investigated to reveal whether the {111} texture can be formed by similar processing. Rolling texture changed from the α-fiber texture in 70% cold rolled sheets to an asymmetric texture on the TD axis consisting of {331} -{111} by additional 40% asymmetric warm rolling at 873 K. Correspondingly, pole density at the center of {111} pole figure increased from 2.16 to 3.18. In addition, microstructural observation showed that there were two kinds of shear bands inclined at about 30° and 150° to RD on the longitudinal section. One was micro shear bands within grains and the other was shear bands passing through a number of grains. Recrystallization texture after annealing also showed an asymmetric texture on the TD axis, but consisted of {431} -{331} near to {110} -{110} . The 1173 K-1800 s annealing decreased pole density at the center of {111} pole figure to 0.78. In conclusion, the rolling texture with near-{111} orientation was obtained in cold rolled and asymmetrically warm rolled austenitic stainless steel sheets. The recrystallization texture, however, changed to near-{110} orientation as a main component.