Understanding the Mechanisms of Texture Evolution of a Fe-24Cr-22Ni-7Mo Super Austenitic Stainless Steel During cold Rolling and Annealing

Abstract

In present study, the texture evolution during cold rolling and subsequent annealing of a Fe-24Cr-22Ni-7Mo super austenitic stainless steel was investigated, and new insights into the mechanisms of texture evolution were obtained. The results show that macrotexture evolution during cold rolling can be categorized into two stages. Below 33.3% cold reduction, the material form strong Goss, Copper, and S texture component due to dislocation plane slipping. Above 33.3% reduction, strong Brass, Goss, and Copper-Twin texture components are formed, accompanied by a decrease in Copper and S component content. Moreover, when the cold reduction reaches 66.6%, the strength of the γ-fibre texture suddenly increases. This increase is attributed to the rotation of the Copper-oriented grains and the Copper-Twin-oriented grains in the lamellar twin region to {111}\(< \overline 1 2\overline 1 >\) and {111}\(< 2\overline 1 \overline 1 >\) along < 011>//TD direction, respectively. It is significant to note that twinning plays a dominant role in the formation of the Brass-type texture in the super austenitic stainless steel at large deformation. Additionally, the annealing of cold deformed materials results in the formation of random and scattered recrystallization texture. This may be due to the small difference in deformation energy storage of grains with different orientations after austenite deformation.

Graphical Abstract