Effect of rare earth on oxidation properties of low-carbon and low-alloy steel

被引：0

作者：

Chen, Wei-Peng ^{[1
,2
]}

Zhang, Huan ^{[2
]}

Xie, Zhi-Hui ^{[2
]}

Ji, Yun-Ping ^{[3
]}

机构：

[1] Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Baotou, China

[2] School of Energy Resources and Environment, Inner Mongolia University of Science and Technology, Baotou, China

[3] School of Materials Science and Engineering Inner Mongolia University of Science and Technology, Baotou, China

来源：

Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | 2015年 / 36卷 / 12期

关键词：

Alloy steel - Oxide films - Cerium compounds - Kinetics - Lanthanum compounds - Rate constants - Steel metallurgy - Low carbon steel - Activation energy - Scanning electron microscopy - Thermooxidation - Isotherms - Rare earths;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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. © 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

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页码：163 / 167