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。
High-temperature oxidation dynamics of austenitic heat resistant stainless steel Cr18Ni3Mn11Cu3NbN under different temperatures was studied using weighting method.The results indicate that the parabolic type oxidation dynamic curve is observed and excellent oxidation resistance is exhibited at temperatures of 700 and 800 ℃,based on the standard of average oxidation velocity for the steel.The surface morphology and structure of the oxidation scale were analyzed by SEM and XRD.The oxidation scale at 700 ℃ mainly consisted of Mn2O3,MnFe2O4（spinel structure） and Cr oxides.At 800 ℃,Fe oxides are identified,and the scale started to peel off.At 900 ℃,the scale is composed of Mn2O3,Fe2O3 and MnFe2O4,and severe delamination occurred.
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