一种含铝奥氏体不锈钢的高温氧化行为

High temperature oxidation behavior of alumina-forming austenitic stainless steel

采用称量法研究了新型Cr21Ni35Nb Al钢分别在700℃、800℃和900℃空气中的静态氧化行为,并绘制其高温氧化动力学曲线。结合X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对高温氧化膜层的形貌及结构进行表征。结果表明:新合金的高温氧化动力学曲线遵循抛物线规律,700℃氧化膜主要为(Fe_(0.6)Cr_(0.4))_2O_3和少量Al_2O_3;800℃氧化膜较为复杂,主要为Al_2O_3、(Al_(0.9_C_(r0.1))_2O_3和少量Fe(Cr,Al)_2O_4;900℃时氧化膜主要为Al_2O_3和少量(Al_(0.9_C_(r0.1))_2O_3。

The static oxidation behavior of a new Cr21Ni35 Nb Al alloy in air at 700 ℃,800 ℃ and 900 ℃,respectively,was studied by using mass gain experiments and the high temperature oxidation kinetics curves were drawn. Investigating the structural changes of hightemperature oxide films,X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and energy dispersive spectrometer（ EDS） analysis were used. The results show that the oxidation kinetics curves of this alloy follow the parabolic law at high temperature. At 700 ℃,（Fe（0.6）Cr（0.4））2O3 and a little of Al2O3 are found on the surface. The oxide film is more complicated at 800 ℃ and consist of Al2O3,（Al（0.9C（r0.1））2O3 and a little of Fe（ Cr,Al）2O4. At 900 ℃,the scale is composed of Al2O3 and a small amount（Al（0.9C（r0.1））2O3.