Study on the Grain Boundary Misorientation Change and Texture Evolution in SUS304 Austenitic Stainless Steel at Low Cold-Rolling Reductions

To study the grain boundary misorientation change and texture evolution in austenitic stainless steel at low cold-rolling reductions, SUS304 austenitic stainless steel samples with a cold-rolling reduction of 5%, 8%, 10%, 15%, 20%, and 23% are prepared. The electron backscatter diffraction analysis reveals that with the increase in the cold-rolling reduction, the proportions of low-angle grain boundary (LAGB) and high-angle grain boundary (HAGB) gradually increase and decrease, respectively. The decrease in HAGB reduces the toughness of the material. With the increase in cold-rolling reduction, the strain area inside the material increases, which enhances the toughness and strength of the steel plate. Austenite textures at different cold-rolling reductions are composed of Brass, Goss, S, and shear texture {011}<122>. The intensity of the Brass-type texture increases with the increasing cold-rolling reduction. The martensite texture mainly consists of R-Cube, Brass, shear texture {111}<110>, {111}<112>, and {332}<113>. When the cold-rolling reduction is less than 15%, the Brass texture appears in the a alpha'-martensite phase. In addition, the intensity of the R-Cube texture increases with the increasing cold-rolling reduction. The martensite phase texture is affected by the austenite phase texture, and its formation can be attributed to the Kurdjumov-Sachs orientation relationship.