NF709奥氏体耐热钢700 ℃的蒸汽氧化行为
Steam Oxidation Behavior of Austenitic Heat Resistant Steel NF709 at 700 ℃
摘 要
采用氧化增重法、扫描电镜(SEM)和X射线衍射分析(XRD)研究了奥氏体耐热钢NF709在700 ℃高温蒸汽下的氧化动力学、氧化层形貌及成分分布。结果表明, 该钢700 ℃蒸汽氧化动力学曲线符合Δm=ktz规律; 随着氧化时间的增长, 氧化层明显增厚, 分层现象明显, 可分为内、外两层。外层较厚, 为疏松多孔结构的富铁氧化物, 内层较薄, 为致密的尖晶石结构的富铬氧化物。内层氧化物有效地阻止了元素的扩散, 降低了氧化速率。
蒸汽氧化
氧化动力学
氧化层
NF709 austenitic heat-resisting steel
oxcidative steam
oxidation kinetics
oxidation layer
Abstract
The oxidation kinetics, the morphology and distribution of chemical composition of oxidaion layers for NF709 austenite heat-resisting steel in water vapor at 700 ℃ were studied by the oxidation weight gain method, SEM with EDS and XRD. The results indicate that the oxidation kinetics of this steel under water-vapor condition follows parabolic equation Δm=ktz at 700 ℃. The thickness of oxidation layer increased with test time. The oxidation scale consists of two layers, the outer layer rich in Fe oxide with a loose and porous structure is more thicker than the inner layer rich in Cr oxide with dense spinel structure. The element diffusion was retarded by the inner layer and so the oxidation rate decreased.
中图分类号 TG172.5
所属栏目 试验研究
基金项目 国家科技支撑计划(2007BAE51B02); 钢研-宝钢研究课题(2007-170)
收稿日期 2012/8/6
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备注王斌, 博士研究生,
引用该论文: WANG Bin,LIU Zheng-dong,CHENG Shi-chang,LIU Chun-ming,BAO Han-sheng,WANG Jing-zhong. Steam Oxidation Behavior of Austenitic Heat Resistant Steel NF709 at 700 ℃[J]. Corrosion & Protection, 2013, 34(4): 279
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参考文献
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【7】Trindade V B, Krupp U, Hanjari B Z, et al.Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP347 [J].Journal of Materials Research, 2005, 8(4):371-375.
【8】唐丽英, 贾建民, 蔡晖, 等.超超临界机组HR3C不锈钢蒸汽侧氧化层的微观结构和生长机理[J].腐蚀与防护, 2011, 32(10):775-778.
【9】岳增武, 傅敏, 李辛庚, 等.晶粒尺寸对P91钢水蒸气氧化行为的影响[J].机械工程材料, 2009, 33(7):98-101.
【10】Asteman H, Sevensson J E, Johansson L G, et al.Indication of chromium oxide hydroxide evaporation during oxidation of 304L at 873 K in the presence of 10% water vapor [J].Oxidation of Metals, 1999, 52(1):95-111.
【11】Asten H, Svensson J E, Norel M, et al.Influence of water vapor and flow rate on the high-temperature oxidation of 304L: effect of chromium oxide hydroxide evaporation [J].Oxidation of Metals, 2000, 54(1):11-26.
【12】耿波, 刘江南, 赵颜芬, 等.T91钢高温水蒸汽氧化层形成机理研究[J].铸造技术, 2004, 25(12):914-918.
【13】金耀华, 刘江南, 王正品, 等.T91钢高温水蒸气氧化动力学研究[J].铸造技术, 2007, 28(2):207-210.
【14】李辛庚, 何家文.喷丸处理提高TP304H耐热钢锅炉管抗水蒸气氧化性能应用效果的观察[J].中国腐蚀与防护学报, 2003, 23(3):171-174.
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