Microstructure and texture of Hi-B steel produced by TSCR process

The microstructure and texture evolution of Hi-B steel produced by thin slab casting and rolling (TSCR) process in the laboratory was studied by metalloscopy and scanning electron microscopy. It was found that the microstructure and texture of the hot rolling slab of Hi-B steel, which was manufactured by simulated TSCR process in the laboratory, was inhomogeneous along the thickness direction. Ferrite grains in the surface decarbonization layer of the normalizing slab obviously coarsen; moreover, the texture of the normalizing slab inherited the texture type of the hot rolling slab, with only a difference in texture density. After cold roiling with big reduction rate, the coarse grains and grain boundaries were stretched to be fibrous bands in the rolling direction, and the α fiber texture and the γ fiber texture were the main texture style. With the deearburizing annealing carrying out, the recovery and reerystallization of the cold rolling slab occurred, primary recrystallization grains formed, and the texture was more centrally distributed. When the temperature increased to 1000℃, secondary recrystallization appeared; at 1010℃ the Goss grains grew up, and the Goss texture intensity reached to 61. 779. By testing, the products had a magnetic induction of 1. 915 T and an iron loss of 1. 0671 W.kg-1.