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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,Fe2O3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+Fe3O4共析组织。
In order to reveal the evolution law of scale in 0.05C-0.02Si-0.2Mn hot-rolled strip during hot working, the phase transition thermodynamics of scale was analyzed by TCFE7 database of Thermo-calc software. The isothermal oxidation test was used to test the experimental steel The kinetic parameters of oxidation were fitted and calculated according to the oxidation weight gain curve at different temperatures (900-1200 ℃). The TMCP process was simulated by Gleeble 3500 thermal simulation machine and analyzed by scanning electron microscope (SEM) Morphology and composition of scale in the process parameters. The results show that with the increase of the rolling temperature, the total thickness of the scale increases, the percentage of Fe2O3 layer decreases, while the percentage of FeO layer first decreases and then increases. The coiling temperature has little effect on the thickness of the scale, The composition of its fine structure has obvious changes, 450 ℃ FeO eutectoid transformation, the transformation of products for the lamellar structure of α-Fe + Fe3O4 eutectoid tissue.