新型含铝奥氏体耐热钢高温氧化行为

High temperature oxidation behavior of a new alumina-contenting austenitic heat resistant steel

对新型含铝奥氏体耐热钢分别在700、800和900℃下进行了循环氧化试验,并采用增重法研究了高温氧化动力学曲线,结合扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)和X射线光电子能谱仪(XPS)系统地表征氧化膜层的元素、结构和形态。结果表明:该新型耐热合金氧化动力学曲线遵循抛物线规律;700℃氧化膜主要由Cr2O3和Fe2O3的混合氧化物与少量Al2O3构成;800和900℃氧化膜由内层的Al2O3和亚表层的(Cr,Al)2O3与表层的尖晶石结构的Fe(Al,Cr)2O4构成。

The oxidation kinetic curves of a new austenitic heat resistant steel which was cyclic-oxidized at 700,800 and 900℃,respectively were obtained by means of weight gain method.The element,structure and morphology of high-temperature oxide films were investigated by means of SEM,XRD,EDS and XPS,systematically.The results show that the oxidation kinetics curves of the new heat resistant steel follow the parabolic law at high temperature.The oxide film at 700℃is mainly composed of Cr2O3 and Fe2O3 and a small amount of Al2O3.The oxide film at 800℃and 900℃is composed of Al2O3 in inner layer and(Cr,Al)2O3 in subsurface layer and Fe(Al,Cr)2O4 in surface layer with spinel structure.