热轧工艺对低强度IF钢组织和性能的影响  

Influence of Hot Rolling Process on Microstructure and Properties of Low-strength IF Steel

作　　者：刘干 艾铖珅[3] 李江委[3] 孔祥磊 王杨 黄明浩 Liu Gan;Ai Chengshen;Li Jiangwei;Kong Xianglei;Wang Yang;Huang Minghao(State Key Laboratory of Metal Materials and Application for Marine Equipment,Anshan 114009,China;The Iron and Steel Research Institute of Ansteel Group,Anshan 114009,China;Bayuquan Iron and Steel Branch Company of Angang Steel Co.,Ltd.,Yingkou 115007,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,鞍山114009 [2]鞍钢集团钢铁研究院,鞍山114009 [3]鞍钢股份有限公司鲅鱼圈钢铁分公司,营口115007

出　　处：《特殊钢》2025年第1期111-116,共6页Special Steel

摘　　要：在某热轧厂产线成功开发出铁素体区轧制工艺技术的基础上,对比研究了铁素体区轧制和奥氏体区轧制两种热轧工艺对低强度IF钢组织、析出相、宏观织构及力学性能的影响。采用OM、TEM和XRD衍射仪等检测方法,对两种工艺下热轧、冷轧退火IF钢金相组织、析出相以及宏观织构的差异进行对比研究,同时采用拉伸试验机检测冷轧退火后IF钢三向拉伸力学性能。研究表明,奥氏体区热轧金相显微组织为等轴状铁素体晶粒,铁素体区热轧组织晶为粒沿轧向被拉长呈纤维状;相比奥氏体区热轧工艺,铁素体区轧制最佳工艺参数为加热温度1150℃+终轧温度800℃+卷取温度720℃,在此工艺下显著降低了屈服强度Rp0.2,析出相尺寸整体大70~85 nm,但TiN析出相尺寸无明显差异;织构方面,冷轧退火IF钢γ织构更强,主要织构各组元取向分布更集中且强度差异较小,相应r值提高0.64,Δr值降低0.35,大大提高了其深冲成型性能,为推广铁素体轧制工艺的应用提供了技术参考。On the basis of the successful developed ferrite zone rolling process technology in a hot rolling plant production line,a comparative study was conducted to investigate the effects of two hot rolling processes,on the metallographic micro⁃structure,precipitation phases,macroscopic texture and mechanical properties of low-strength IF steel.OM,TEM and XRD diffraction were used to compare and analyse the differences in metallographic microstructure,precipitation phases and macroscopic texture of IF steel in hot-rolled and cold-rolled annealed condition under the two rolling processes,and at the same time,the three-way tensile mechanical properties of IF steel were tested by the ZWICK tensile tester after coldrolled annealing.The results show that the microstructure of hot-rolled IF steels in the austenitic zone was equiaxed grains,while the grains of hot-rolled IF steel in the ferrite zone are elongated and fibrous along the rolling direction;Com⁃pared with the austenitic zone hot rolling process,the optimum process parameters for ferrite zone rolling are heating tem⁃perature 1150℃+final rolling temperature 800℃+coiling temperature 720℃,in which the yield strength Rp0.2 is signifi⁃cantly reduced,and the size of precipitated phases is overall larger by 70-85 nm,but there is no significant difference in the size of TiN precipitated phases;In terms of texture,cold-rolled annealed IF steelγtexture is stronger,and the orienta⁃tion distribution of each component in the main texture is more concentrated with smaller differences in strength.The corre⁃sponding r value increases by 0.64,while theΔr value decreases by 0.35,significantly improving its deep drawing form⁃ability.This provides a technical reference for promoting the application of ferrite rolling technology.

关 键 词：低强度IF钢 铁素体 轧制 组织性能 析出物 织构 

分 类 号：TG335.5[金属学及工艺—金属压力加工]