TMCP工艺对低碳钢氧化铁皮演变规律的影响.docx

TMCP 工艺对低碳钢氧化铁皮演变规律的影响李辉1 ，路峰2 ，江海涛1 ，刘胜1 ，米振莉1( 1． 北京科技大学 冶金工程研究院，北京100083; 2． 莱钢集团有限公司 技术中心，山东 莱芜271104) 摘要: 为揭示 0． 05C-0． 02Si-0． 2Mn 热轧带钢热加工过程中氧化铁皮的演变规律，运用 Thermo-calc 软件的 TCFE7 数据库对氧化铁皮 的相变热力学进行分析; 采用等温氧化试验测试了试验钢在不同温度( 900 ～ 1200 ℃ ) 下的氧化增重曲线，拟合计算出其氧化动力学参数; 利用 Gleeble3500 热模拟试验机模拟控轧控冷( TMCP) 工艺，用扫描电镜( SEM) 分析不同工艺参数下氧化铁皮的形貌和组 成。试验结果表明，随轧制温度的升高，氧化铁皮总厚度增加，Fe2 O3 层的百分比逐渐降低，而 FeO 层的百分比呈现先降低后增高的 趋势; 卷取温度对氧化铁皮厚度影响不大，但对其精细组织组成有明显的改变，450 ℃ 时 FeO 发生共析转变，转变产物为片层结构 的 α-Fe + Fe3 O4 共析组织。关键词: 动力学; 控轧控冷; 组织演变; 共析转变中图分类号: TG142． 1 文献标志码: A 文章编号: 0254-6051( 2014) 01-0080-05Effect of TMCP process on evolution of oxide scale of low carbon steelLi Hui1 ，Lu Feng2 ，Jiang Haitao1 ，Liu Sheng1 ，Mi Zhenli1( 1． Engineering Ｒesearch Institute，University of Science and Technology Beijing，Beijing 100083，China; 2． Technology Center，Laiwu Iron ＆ Steel Group Co． ，Ltd． ，Laiwu Shandong 271104，China)Abstract: To investigate the evolution of oxide scale of 0． 05C-0． 02Si-0． 2Mn steel during hot rolling，the phase transition thermodynamicbehavior of the oxide scale was analyzed by Thermo-calc software with the database of TCFE7． The oxidation weight gained curves at different temperature ( 900-1200 ℃ ) were tested by means of isothermal oxidation experiments，and the oxidation kinetics parameter was calculated． The TMCP process was simulated by Gleeble3500 thermal simulation tester． SEM was used to detect the microstructure of oxide scale． The results show that the total thickness of the oxide scale increases in accordance with the rolling temperature increasing． The volume fraction of Fe2 O3 scale decreases，and the FeO scale has the tendency of decreased first before enhanced． The coiling temperature has no significantinfluence on thickness of the oxide scale，however，it will change the fine microstructure． FeO transforms into α-Fe and Fe3 O4 at 450 ℃ ．Key words: kinetics; thermo-mechanical control process( TMCP) ; microstructure evolution; eut