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采用机械合金化及热压法制备Fe-20Cr-2.5Al、Fe-20Cr-2.5Al-0.8Y2O3和Fe-20Cr-2.5Al-3Y2O3合金,研究了不同Y2O3含量对MA Fe-Cr-Al合金在900℃空气中循环氧化行为的影响。结果表明,Fe-20Cr-2.5Al合金氧化增重最大,Fe-20Cr-2.5Al-3Y2O3合金氧化增重其次,Fe-20Cr-2.5Al-0.8Y2O3合金氧化增重最少,抗高温循环氧化性能最好。Fe-20Cr-2.5Al合金的氧化膜分为三层,外层主要为Fe2O3,与镍层连接界面有很薄一层不连续的Al2O3,中间层主要为Fe2O3和Cr2O3的复合氧化物,氧化膜内层主要为Fe Cr2O4;Fe-20Cr-2.5Al-0.8Y2O3合金的氧化膜没有明显分层现象,氧化膜主要为Cr2O3;Fe-20Cr-2.5Al-3Y2O3合金的氧化膜分为两层,外层主要由Al2O3和Cr2O3交替连接形成,内层主要由Cr2O3组成,有很薄的复合氧化物Fe Cr2O4。Y2O3的添加可有效提高Fe-20Cr-2.5Al合金的抗循环氧化能力,其中Fe-20Cr-2.5Al-0.8Y2O3合金好于Fe-20Cr-2.5Al-3Y2O3合金。
Fe-20Cr-2.5Al, Fe-20Cr-2.5Al-0.8Y2O3 and Fe-20Cr-2.5Al-3Y2O3 alloys were prepared by mechanical alloying and hot pressing. The effects of different Y2O3 contents on the mechanical properties of MA Fe-Cr- Effect of Cyclic Oxidation Behavior in Air at 900 ℃. The results showed that the oxidation weight gain of Fe-20Cr-2.5Al-3Y2O3 alloy was the highest, and the oxidation-induced weight gain of Fe-20Cr-2.5Al-0.8Y2O3 alloy was the lowest. it is good. The oxide film of Fe-20Cr-2.5Al alloy is divided into three layers, the outer layer is mainly Fe2O3, the interface with the nickel layer is very thin with a layer of discontinuous Al2O3, the middle layer is mainly the composite oxide of Fe2O3 and Cr2O3, the oxide film The inner layer is mainly Fe Cr2O4; the oxide film of Fe-20Cr-2.5Al-0.8Y2O3 alloy is not obviously delaminated, the oxide film is mainly Cr2O3; the oxide film of Fe-20Cr-2.5Al-3Y2O3 alloy is divided into two layers, The layer is mainly formed by the alternating connection of Al2O3 and Cr2O3, the inner layer is mainly composed of Cr2O3, and the very thin composite oxide Fe Cr2O4. The addition of Y2O3 can effectively improve the anti-cyclic oxidation ability of Fe-20Cr-2.5Al alloy, and Fe-20Cr-2.5Al-0.8Y2O3 alloy is better than Fe-20Cr-2.5Al-3Y2O3 alloy.