The Annealing Microstmcture and Properties in Extra Low-Carbon and High Strength Bake-Hardening Sheet Steel
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摘要: 采用金相觀察和極圖分析方法進行了研究。研究表明,回復階段,再結晶晶粒和結構均未出現;再結晶完成階段.由于具有較高的冷軋變形儲能,{111}取向的晶粒優先形核、長大;晶粒長大階段,{111}取向的品粒吞并其他取向的品粒而繼續長大并趨于均勻;通過增大退火均熱溫度和均熱時間來延長品粒長大階段是提高深沖性的有效措施。Abstract: 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.
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