The Annealing Microstmcture and Properties in Extra Low-Carbon and High Strength Bake-Hardening Sheet Steel

Through metallographical observation and pole figure analysis, the changes of recrystallization microstructure and texture have been studied in this paper in order to discover the influence mechanism of annealing process parameters on the properties of extra low-carbon and high strength bake-hardening sheet steel (ELC-BH sheet). Experimental results are shown as follows:① Recrystallization microstructure and texture weren't discovered at recovery stage; ② Forming nucleus and growth of 111 orientation grains were more precedent than that of other orientation grains at finished recrystallization stage because of its relatively high storage energy in cold-rolled deformation microstructure; ③ 111 textures were sharpened by annexing other orientation grains at grain growth stage; ④ The process of grain growth was prolonged with the increase of soaking temperature and soaking time so that deep drawability was improved.