Oxygenated Treatment on Saturated Vapour Oxidation Behaviors of GH2984 Alloys for 700 °C Ultra-supercritical Boilers

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-12-01 DOI:10.1016/S1875-5372(19)30016-5

Wang Yu , Liu Jiangnan , Wang Zhengpin , Yao Yuhong , Yu Zaisong , Lu Jintao

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引用次数: 1

Abstract

The saturated vapor oxidation behavior of GH2984 alloys at 750 °C were investigated by oxidation weight increasing method, X-ray diffraction and scanning electronic microscopy in different dissolved oxygen concentrations. The results show that the oxide film of GH2984 alloys in different dissolved oxygen concentrations is of a single layer consisting of continuous Cr₂O₃. The oxidation mass gain of GH2984 alloys slightly increases with the increase of the dissolved oxygen concentrations in water vapor. Oxygenated treatment could accelerate the internal oxidation phenomenon, enhance the oxidation film thickness and make the scattered nodular bulges of Fe₂O₃ disappear and more Cr-rich nodular bulges form. Moreover, high dissolved oxygen concentrations do not affect the stabilization of Cr₂O₃ but contribute to the formation of a little Al₂O₃ and TiO₂ which are oxidized internally.

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700℃超超临界锅炉GH2984合金饱和蒸汽氧化行为的氧合处理

采用氧化增重法、x射线衍射和扫描电镜研究了不同溶解氧浓度下GH2984合金在750℃下的饱和蒸汽氧化行为。结果表明:不同溶解氧浓度下GH2984合金的氧化膜均为连续的Cr2O3组成的单层氧化膜;随着水蒸气中溶解氧浓度的增加，GH2984合金的氧化质量增益略有增加。氧化处理加速了内部氧化现象，增加了氧化膜厚度，使Fe2O3分散的结节状凸起消失，形成更多富cr的结节状凸起。此外，高溶解氧浓度不影响Cr2O3的稳定，但有助于少量Al2O3和TiO2的形成，并被内部氧化。

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