摘要
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。
Isothermal oxidation experiment at 950-1250 ℃ in vertical tube furnace for a low-carbon and low-alloy steel containing anthanum-cerium rare earth compound was carried out. The oxidation kinetics curves were plotted by thermal gravity analysis（ TGA）method. Morphology of the surface oxidation films was observed by scanning electron microscopy（ SEM）. The results show that the isothermal oxidation kinetic curves at 950 ℃,1050 ℃,1150 ℃ and 1250 ℃ all conform to the parabolic laws and the oxide film has the protective effect. The reaction activation energy of the low-carbon and low-alloy steel is increased and the oxidation rate constant is reduced by the addition of rare earth,so the high-temperature oxidation resistance of the steel is improved,and the steel with higher content of rare earth exhibits the higher high-temperature oxidation resistance. By adding the lanthanum-cerium rare earth compound,the grains of the surface oxidation films of the low-carbon and low-alloy steel are refined and the binding strength between the oxidation films and the matrix is improved,so the oxidation films are not easy to peel off,which is beneficial to improving the oxidation resistance of the steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第12期163-167,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51261018)
关键词
稀土
氧化动力学
氧化膜
抗氧化性
rare earth
oxidation kinetics
oxidation film
oxidation resistance
