奥氏体区和铁素体区热轧IF钢板的织构及成形性能  

Texture and Formability of IF Steel Sheets Hot-Rolled in Austenitic Region and Ferritic Region

作　　者：赵楠 刘学伟 薛军 ZHAO Nan;LIU Xuewei;XUE Jun(Technology Center of Meisteel,Baosteel Central Research Institute,Nanjing Jiangsu 210039,China)

机构地区：[1]宝钢股份中央研究院梅钢技术中心,江苏南京210039

出　　处：《上海金属》2024年第2期47-52,共6页Shanghai Metals

摘　　要：采用金相观察、织构分析、成形极限试验等,研究了奥氏体区和铁素体区热轧含Ti的IF钢板的显微组织、织构特征及成形性能,探讨了影响钢板成形性能的因素、钢中Ti元素的作用以及织构的形成。结果表明:奥氏体区热轧IF钢的铁素体晶粒均匀,呈等轴状,铁素体区热轧IF钢的晶粒沿轧制方向被拉长,形成形变带,呈纤维状。相比铁素体区热轧IF钢,奥氏体区热轧IF钢具有更低的屈服强度、抗拉强度和屈强比,更高的平均塑性应变比、平均硬化指数和断后伸长率,以及高的FLD0值(成形极限图中平面应变处的主应变),成形性能更好。在两个区域热轧的IF钢均有较高强度的{110}〈112〉织构,其中铁素体区热轧IF钢有一定强度的{110}〈uvw〉纤维织构,奥氏体区热轧IF钢有一定强度的{111}γ纤维织构,γ取向密度较大,形成了具有一定强度的{111}〈101〉、{111}〈112〉等有利织构。Microstructure,texture characteristics,and formability of IF steel sheets containing Ti hot-rolled in austenitic region and ferritic region were studied by using metallographic observation,texture analysis,and forming limit test and so on,and the factors affecting formability of the steel plate,the role of Ti element in the steel,as well as the formation of texture were discussed.The results showed that(a)the ferrite grains of IF steel hot-rolled in austenitic region were uniform and equiaxed,while the grains of IF steel hot-rolled in ferritic region were stretched in the rolling direction and the fibrous deformation bands formed;(b)compared with the IF steel hot-rolled in ferritic region,the IF steel hot-rolled in austenitic region had lower yield strength,tensile strength and yield ratio,higher average plastic strain ratio,average hardening index and elongation,as well as a higher value of FLD0(principal strain in plane field in forming limit diagram)and better formability;(c)the IF steels hot-rolled in two regions all had relatively higher intensity of{110}〈112〉texture,the IF steel hot-rolled in ferritic region had intensive{110}〈uvw〉fiber texture,while the one hot-rolled in austenitic region had{111}γfiber texture with a certain intensity and higherγorientation density,forming{111}〈101〉,{111}〈112〉and other beneficial texture with certain intensity.

关 键 词：IF钢 显微组织 织构 成形性能 

分 类 号：TG115[金属学及工艺—物理冶金]