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采用称重法测得了奥氏体不锈钢Cr18Ni3Mn11Cu3NbN在不同温度下的高温氧化动力学曲线,结果表明,该钢在700℃和800℃的氧化曲线遵循抛物线氧化规律,根据平均氧化速度的评级标准,在此温度下钢“完全抗氧化”。利用扫描电镜、X射线衍射的方法对氧化膜表面的形貌及结构进行了研究,发现该钢700℃氧化膜致密完整,主要由Mn2O3、MnFe2O4(尖晶石结构)和Cr的氧化物组成;800℃氧化膜出现脱落,主要由Mn2 O3、MnFe2 O4(尖晶石结构)、Cr的氧化物和Fe的氧化物组成;900℃氧化膜脱落严重,主要由Mn2O3、Fe2O3、尖晶石结构的MnFe2O4组成。
The oxidation kinetics curves of austenitic stainless steel Cr18Ni3Mn11Cu3NbN at different temperatures were measured by weighing method. The results showed that the oxidation curves of the steel at 700 ℃ and 800 ℃ follow the parabolic oxidation rule. According to the average oxidation rate rating criterion, This temperature steel “completely antioxidant”. The morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction. The results showed that the oxide film at 700 ℃ is dense and complete, mainly composed of Mn2O3, MnFe2O4 (spinel structure) and Cr oxide. 800 ℃ oxide film appears off, mainly by Mn2 O3, MnFe2 O4 (spinel structure), Cr oxide and Fe oxide composition; 900 ℃ oxide film off serious, mainly by Mn2O3, Fe2O3, spinel structure MnFe2O4 composition.