Research Of Deformation And Primary Recrystalization Microstructure And Texture Of Hi-B Steel Produced By Stimulating CSP Process

Traditional high–temperature-strip-production technology of Hi-B steel revealsconsiderable drawbacks. Developing cost-effective, energy saving and environmental friendlyproduction methods has become one of the major hotspots among large steel corporations andresearch institutes. CSP (Compact Strip Production) combines high productivity with excellentstrip quality in a perfect way. Thus it is necessary to further develop CSP technology for Hi-Bsteel production.This article simulated CSP for producing Hi-B steel under experimental conditions, anddesigned a range of experiments from steelmaking to recrystallization and annealing inlaboratory. The major research details were listed below:1) Hot strip produced with CSP formed obvious organization gradient and texture gradientalong thickness. GOSS grains mainly distributed at subsurface near grains with crystalorientation {111} and the number of grains gradually reduced from subsurface to core. Thestrength of α oriented grains <110>//RD gradually increased from surface to core. Moreover, thenumber of recrystallized grains of normalizing strip also increased. The organization gradient,texture gradient and overall strength of texture of inherited hot-rolled strip reduced.2) The texture type dramatically changed after cold rolling, which formed incomplete α{001}~{111}<110>fiber texture and complete γ {111}<110>~<112> fiber texture. When thecold-rolling pressure is above88%, the strength γ fiber texture reduced and strongly aggregatedat {111}<110>.Meanwhile, the strength of {112}(110) oriented texture significantly reduced. Itis more efficient to control cold-rolling pressure below88%in this experiment.3) The strength of α fibre texture reduced after first recrystallization which mainly occurredat {118}<110>. While the strength of γ fiber texture improved and strongly aggregated at{111}<112>. GOSS texture formed again which mainly concentrated on subsurface of samples.Compared cold-rolled Hi-B steel with normalizing cold-rolled Hi-B steel after primary recrystal-lization annealing, the latter displayed weaker strength of total α fibre texture, stronger strengthof total γ fiber texture and stronger GOSS texture at the same cold-rolling pressure. Theseillustrated that cold rolling is more favourable after normalizing.