采用静态氧化试验和XRD、SEM、EDS等测试方法分析了机械合金化制备铁基高温合金Fe-12Cr-2.5W-0.4Ti-0.3Y2O3在空气中的高温氧化行为及其氧化机理。结果表明: 合金氧化程度随温度的升高而提高, 随时间的延长质量增加速率不断减小, 且质量增加曲线近似为抛物线; 合金在650 ℃和850 ℃下氧化80 h后, 表层氧化物主要为Fe2O3, 氧化膜分为两层, 外层为Fe2O3, 靠近基体的主要为Fe2O3和Cr2O3的混合物; 650 ℃氧化后合金的氧化膜厚度约为10 μm且致密平整, 具有较好的抗氧化能力; 850 ℃氧化后合金的氧化膜厚度大于25 μm, 且有疏松和剥落现象, 靠近基体的氧化膜不连续, 从而丧失了对基体的保护性。

Elevated temperature oxidation behavior and mechanism of the Fe-12Cr-2.5W-0.4Ti-0.3Y2O3 Fe-based super alloy prepared by mechanical alloying were investigated by stastic oxidation test through XRD, SEM and EDS. The results show that oxidation degree of the alloy increased with the elevation of temperature, and with the extension of time the speed of mass gain decreased. And the curves of gained mass were liner to parabola. Furthermore, After oxidation for 80 h at 650 ℃ and 850 ℃, the oxide on surface was mainly Fe2O3. The oxide layers consisted of two layers, the outside layer was Fe2O3 and the inside layer near the matrix was mainly compound of Fe2O3 and Cr2O3. The oxide layer obtained at 650 ℃ was approximate 10 μm and compact with preferable oxidation resistance, while the layer obtained at 850 ℃ was more than 25 μm with phenomenon of desquamation and discontinuous of its inside layer near matrix which had lost its ability of protection.