High Temperature Oxidation Behavior of S44535 Ferritic Stainless Steel

doi:10.20057/j.1003-8620.2023-00094

Abstract

Abstract: In order to explore the effect of rare earth La on the high-temperature oxidation behavior of S44535 ferritic stainless steel， accelerated oxidation was used to study the high-temperature oxidation of S44535 steel added with 0.26% La in static air at 800°C，900 ℃and 1 000 ℃. In this paper， the oxidation kinetic curves of S44535 ferritic stainless steel at three temperatures were compared by constant temperature oxidation method， and the oxide layer of steel was characterized by scanning electron microscopy （SEM）， energy spectroscopy analyzer （EDS） and X-ray diffraction （XRD）， and the effect of rare earth La on the high-temperature oxidation resistance of ferritic stainless steel was explored. The results showed that the oxidation products were mainly Cr2O3 and MnCr2O4， and with the increase of temperature， the surface oxide film thickened and became denser， and its outer layer was rich in Mn， and the inner layer was rich in Cr， indicating that rare earths changed the growth direction of the oxide film， and showed excellent high temperature oxidation resistance performance.

Key words: Solid Oxide Fuel Cells, Ferritic Stainless Steel, High Temperature Oxidation, Oxidation Kinetics, Rare Earth La

摘要： 为了探究稀土 La对 S44535铁素体不锈钢高温氧化行为的影响，采用加速氧化对添加 0.26% La的 S44535钢在800、900、1000 ℃下的静态空气中进行高温氧化研究。采用恒温氧化法对比S44535铁素体不锈钢在三种温度下的氧化动力学曲线，用扫描电镜（SEM）、能谱分析仪（EDS）和 X射线衍射（XRD）对钢的氧化层进行表征分析，探究了稀土La对铁素体不锈钢高温抗氧化性能的影响。结果表明，氧化产物主要为Cr₂O₃和MnCr₂O₄，随着温度的升高，表面氧化膜增厚且更加致密，其外层富含 Mn，内层富含 Cr，说明稀土改变了氧化膜的生长方式，且呈现出较为优异的高温抗氧化性能。

关键词: 固体氧化物燃料电池, 铁素体不锈钢, 高温氧化, 氧化动力学, 稀土La

CLC Number:

TG172. 1

Cao Xiaoqiang, Jia Jianwen , Yue Xiwen, Hu Qunkun , Wei Yinghui , Hou Lifeng. High Temperature Oxidation Behavior of S44535 Ferritic Stainless Steel[J]. Special Steel, 2024, 45(2): 66-73.

曹小强, 贾建文, 岳习文, 胡群昆, 卫英慧, 侯利锋. S44535铁素体不锈钢高温氧化行为[J]. 特殊钢, 2024, 45(2): 66-73.

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