热轧高强钢氧化动力学和氧化铁皮结构控制

通过实验室氧化增重实验和热模拟实验系统研究了不同时间和温度条件下高强钢(610L)的氧化动力学行为和FeO的转变行为,推导出了变温条件氧化动力学模型,在此基础上可实现热轧高强钢的厚度演变规律研究;测定了高强钢610L的氧化铁皮的等温转变曲线,指出FeO等温转变包含两个转变过程,即第一个转变过程为析出先共析Fe3O4,第二个转变过程发生共析反应(FeO→Fe+Fe3O4),同时给出610L钢FeO层发生先共析转变和共析转变的“鼻温”范围分别为350~500℃和350~450℃,为控制氧化铁皮结构提供了理论依据.

Oxidation Kinetics and Oxide Scales Control of Hot-Rolled High Strength Steel

The oxidation kinetics and transformation behaviors of FeO formed on high-strength steel (610L) were studied by oxide weight gain experiment and thermal simulation at different oxidation temperature and different isothermal holding time. Oxidation kinetic model under the condition of alternative temperature was derived, and the evolution rule of oxide scales of high-strength steel during hot strip rolling was studied. The isothermal transformation curves for 610L were measured. The results showed that the isothermal transformation of FeO includes two kinds of phase transformations, the first one is the proeutectoid precipitation of Fe3O4, and the second is the eutectoid transformation of FeO&rarrFe+Fe3O4. The range of the pro-eutectoid reaction "nose" temperature of 610L is 350~500°C, and the eutectoid reaction "nose" temperature is 350~450°C. These results are useful for the oxide scale structure control.