Q345钢的高温氧化动力学研究

Study on High Temperature Oxidation Kinetics of Q345 Steel

采用热重分析仪对Q345钢在不同温度下的氧化动力学行为进行研究,建立了Q345钢在900~1100℃的氧化动力学模型,研究了Q345钢的氧化皮厚度演变规律。结果表明：在高温恒温氧化过程中,Q345钢前期氧化增重较快,后期氧化增重趋于平缓;900℃时氧化增重符合直线型增长规律,950、980℃氧化增重符合对数型增长规律,1050℃的前期氧化增重符合直线型增长规律而中后期符合对数型增长规律。

The oxidation kinetics behavior of Q345 steel at different temperatures was studied by thermogravimetric analyzer. The oxidation kinetic model of Q345 steel was established between 900 ℃ and 1100 ℃. The evolution law of the scale thickness ofQ345 steel was analyzed. The results show that in the process of high temperature and isothermal oxidation, in the earlier stage, the increase of oxidation mass gain is fast, and the oxidation mass gain in the later period tends to be gentle. At 900 ~C, the oxidation mass gain conforms to the law of linear growth, at 950℃ and 980 ℃, the oxidation mass gain conforms to the law of logarithmic growth. At 1050 ℃, in the early stage ,the oxidation mass gain accords with the law of linear growth and in the middle-later period, the oxidation mass gain accords with the logarithm rule.