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针对不加稀土与添加镧铈混合稀土的低碳低合金钢,在立式管式炉中进行950~1250℃的恒温氧化实验,利用静态增重法绘制氧化动力学曲线,采用扫描电镜对实验钢表面的氧化膜形貌进行观察。结果表明:950~1250℃的恒温氧化动力学曲线均符合抛物线规律,氧化膜具有保护性。稀土的添加提高低碳低合金钢的反应激活能,降低氧化速率常数,提高了抗高温氧化性能,且稀土含量较高的,抗高温氧化性能更好。稀土的添加细化了低碳低合金钢氧化膜的晶粒,增强了氧化膜与基体的粘附性,使氧化膜不易脱落,从而有助于提高抗氧化性能。
Aiming at the low carbon and low alloy steel with rare earth and lanthanum cerium mixed rare earth added, the oxidation experiment of constant temperature was carried out in a vertical tube furnace at 950-1250 ℃. The oxidation kinetics curve was drawn by static weight increase method. The oxide film morphology of the steel surface was observed. The results show that the kinetic curves of oxidation at 950 ~ 1250 ℃ are in accordance with the law of parabola, and the oxide film is protective. The addition of rare earth increases the reaction activation energy of low carbon and low alloy steel, decreases the oxidation rate constant, improves the high temperature oxidation resistance, and has higher rare earth content and better oxidation resistance under high temperature. The addition of rare earth refined the grain of the low-carbon low alloy steel oxide film, enhanced the adhesion between the oxide film and the matrix, and made the oxide film not easy to fall off, thus contributing to the improvement of the oxidation resistance.