A microstructural study of the origins of gamma recrystallization textures in 75 percent warm rolled IF steel

摘要

IF steel was warm rolled at 700 deg C in a single pass. The resulting texture and microstructure were remarkably similar to those of the same steel after cold rolling. A detailed investigation of the microstructure by orientation imaging microscopy and scanning transmission electron microscopy showed microbands to have a mutual misorientation of less than 4° and shear bands to contain material misoriented from the parent matrix by less than 10 deg. Recrystallization did not occur preferentially at high-angle grain boundaries nor in shear bands. Instead the recrystallization nuclei were confined in the original hot band grain envelopes in crystals belonging to the gamma fiber. These gamma deformed grains had systematically developed deformation bands which consisted of elements that had rotated by up to approx 30 deg about the (111) parallel to the normal direction. This is essentially the same nucleation process as observed in cold rolled and annealed IF steel.