超临界机组T91钢管蒸汽侧氧化膜特征和脱落机制的分析

特殊钢 ›› 2016, Vol. 37 ›› Issue (3): 50-53.

超临界机组T91钢管蒸汽侧氧化膜特征和脱落机制的分析

廖书全¹,王新猛²,涂益友²,李国忠³

1江阴兴澄特种钢铁有限公司，江阴214429 ；
2东南大学材料科学与工程学院，南京211189；
3湖北新冶钢有限公司，黄石435001

收稿日期:2015-12-07 出版日期:2016-06-01 发布日期:2022-08-04
作者简介:廖书全(1973-)，男，硕士(2009年北京科技大学)，高级工程师,1998年包头钢铁学院毕业，金属材料研究。

Analysis on Characteristics and Exfoliation Mechanism of Oxidized Film at Steam-Side of Steel T91 Tube in Supercritical Power Unit

Liao Shuquan¹, Wang Xinmeng², Tu Yiyou²,Li Guozhong³

1 Jiangyin Xingcheng Special Steel Co Ltd, Jiangyin 214429；
2 School of Materials Science and Engineering, Southeast University, Nanjing 211189 ;
3 Hubei Xinyegang Steel Co Ltd, Huangshi 435001

Received:2015-12-07 Published:2016-06-01 Online:2022-08-04

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜、能谱仪、X射线衍射仪对超临界机组571.5℃蒸汽服役28 800 h的T91钢（/%:0.10C，0.35Si，0.43Mn，7.85Cr，0.81Mo，0.24V）Φ90 mm×10 mm管材氧化膜的成分、相组成、形貌和脱落机制进行了分析和研究。结果表明,T91钢氧化膜厚度约为307.3μm,呈现多层复杂结构,扩散层为Cr₂O₃和基体晶粒的混合物,内氧化层为FeCr₂O₄,中间氧化层为FeCr₂O₄和Fe₂O₄的混合物,外氧化层为Fe₃O₄和Fe₂O₃。FeCr₂O₄和Fe₃O₄的界面处存在大量孔洞,在热应力作用下,外氧化层极易开裂和脱落。

Abstract: The ingredient, phases, morphology and exfoliation mechanism of oxide formed at steam-side of Φ90 mm x 10 mm tube of steel T91 (/% : 0. 10C, 0. 35Si, 0. 43Mn, 7. 85Cr, 0. 81 Mo, 0. 24V) for supercritical power unit in vapour at 571. 5 ℃ vapour served for 28800h have been analyzed and studied by optical microscope, scanning electron microscope with energy dispersive spectroscope and X-ray diffractometer. Results show that the thickness of oxide film of steel T91 is about 307. 3 μm with multi-layer structure, its diffusion layer is mixture of Cr₂O₃ and grains of base metal, the inner oxidized layer is FeCr₂O₄, the middle oxidized layer is mixture of FeCr₂O₄ and Fe₃O₄, and the outer oxidized layer is Fe₃O₄ and Fe₂O₃ . There are a lot of pores at FeCr₂O₄-Fe₃O₄ interface, by the action of thermal-stress the outer oxidized layer is easily to crack and exfoliate.

廖书全, 王新猛, 涂益友, 李国忠. 超临界机组T91钢管蒸汽侧氧化膜特征和脱落机制的分析[J]. 特殊钢, 2016, 37(3): 50-53.

Liao Shuquan, Wang Xinmeng, Tu Yiyou, Li Guozhong. Analysis on Characteristics and Exfoliation Mechanism of Oxidized Film at Steam-Side of Steel T91 Tube in Supercritical Power Unit[J]. Special Steel, 2016, 37(3): 50-53.

参考文献

[1]Viswanathan R,Coleman K,Rao U. Materials for Ultra-Supercritical Coal-Fired Power Plant Boilers[J]. International Journal of Pressure Vessels and Piping,2006,83( 11 -12) ：778-783.
[2]Montgomery M, Hansson A, Vilhelmsen T,et al. Steam Oxidation of X20CrMoV121: Comparison of Laboratory Exposures and in Situ Exposure in Power Plants[J]. Materials and Corrosion,2012,63 (8): 674-684.
[3 ] Wright I G,Dooley R B. Morphologies of Oxide Growth and Exfoliation in Superheater and Reheater Tubing of Steam Boilers[J]. Materials at High Temperatures ,2011,28 (1) ：40-57.
[4]Shingledecker J P,Pint B A,Sabau A S,et al. Managing Steam-Side Oxidation and Exfoliation in USC Boiler Tubes [J]. Advanced Materials & Processes,2013,171 (1) ：23-25.
[5]Yin K,Qiu S,Tang R,et al. Corrosion Behavior of Ferritic/Martensit- ic Steel P92 in Supercritical Water[J]. The Journal of Supercritical Fluids,2009,50(3) ：235-239.
[6]Chen Y,Sridharan K, Allen T. Corrosion Behavior of Ferritic-Martensitic Steel T91 in Supercritical Water[J], Corrosion Science,2006, 48(9) ：2843-2854.
[7]SchUtze M,Schoir M,Renusch D,et al. The Role of Alloy Composition ,Environment and Stresses for the Oxidation Resistance of Modem 9% Cr Steels for Fossil Power Stations [J]. Materials Research, 2004,7(1) ：111-123.
[8]Ampornrat P, Was G S. Oxidation of Ferritic-Martensitic Alloys T91, HCM12A and HT-9 in Supercritical Water [ J ]. Journal of Nuclear Materials,2007,371(1-3):1-17.
[9]Laverde D,Gdmez-Acebo T,Castro F. Continuous and Cyclic Oxidation of T91 Ferritic Steel Under Steam[ J]. Corrosion Science,2004, 46(3) ：613-631.
[10]Martinelli L,Balbaud-cfekrier F,Terlain A,et al. Oxidation Mechanism of a Fe-9Cr-1 Mo Steel by Liquid Pb-Bi Eutectic Alloy ( Part Ⅰ ) [J]. Corrosion Science,2008,50(9) ：2523-2536.
[11]Martinelli L,Balbaud-c&Mrier F,Terlain A,et al. Oxidation Mechanism of a Fe-9Cr-1 Mo Steel by Liquid Pb-Bi Eutectic Alloy at 470 r (Part Ⅱ ) [J]. Coirosion Science,2008,50(9) ：2537-2548.
[12]Martinelli L,Balbaud-c616rier F,Picard G,et al. Oxidation Mechanism of a Fe-9Cr-1 Mo Steel by Liquid Pb-Bi Eutectic Alloy ( Part Ⅲ ) [J]. Corrosion Science,2008,50(9) ：2549-2559.
[13]Zhong X,Wu X,Han E-H. The Cheaxicteristic of Oxide Scales on T91 Tube After Long-Term Service in an Ultra-Supercritical Coal Power Plant [J]. The Journal of Supercritical Fluids, 2012, 72 (Complete) ：68-77.
[14]Evans H. Cracking and Spalling of Protective Oxide Layers[J]. Materials Science and Engineering： A, 1989,120： 139-146.
[15]Zurek J,Wessel E,Niewolak L,et al. Anomalous Temperature Dependence of Oxidation Kinetics during Steam Oxidation of Ferritic Steels in the Temperature Range 550 ~ 650℃ [J]. Corrosion Science,2004,46(9) ：2301-2317.
[16]Wright I G, Dooley R. A Review of the Oxidation Behaviour of Structural Alloys in Steam [J]. International Materials Reviews, 2010,55(3):129-167.
[17]Was G,Ampornrat P,Gupta G,et al. Corrosion and Stress Corrosion Cracking in Supercritical Water [J]. Journal of Nuclear Materials, 2007,371(1):176-201.
[18]Ren X, Sridharan K, Allen T R. Corrosion of Ferritic-Martensitie Steel HT9 in Supercritical Water[J]. Journal of Nuclear Materials, 2006,358(2-3):227-234.
[19]Kai to T, Narita T,Ukai S,et al. High Temperature Oxidation Behavior of ODS Steels[J]. Journal of Nuclear Materiak ,2004,329-333, Part B(0) ：1388-1392.
[20]Ennis P J, Quadakkers W J. Implications of Steam Oxidation for the Service Life of High-Strength Martensitic Steel Components in High-Temperature Plant[J]. International Journal of Pressure Vessels and Piping,2007,84( 1-2) ：82-87.
[21] Chen Y,Sridharan K,Allen T R,et al. Microstructural Examination of Oxide Layers Formed on an Oxide Dispersion Strengthened Ferritic Steel Exposed to Supercritical Water[J]. Journal of Nuclear Materials ,2006,359(1-2)： 50-58.
[22]ARIZTEGUI A,GOMEZ-aCEBO T,CaSTRO F. Steam Oxidation of Ferritic Steels: Kinetics and Microestruciure[ J]. Boletin De La So- ciedad Esanola De Ceramica y Vidrio ,2000,39(3) :305-311.
[23]Isselin J,Kasaka R,Kimura A. Coirosion Behaviour of 16%Cr-4% Al and 16% Cr ODS Ferritic Steels Under Different Metallurgical Conditions in a Supercritical Water Environment[J]. Corrosion Science,2010,52( 10) ：3266-3270.
[24]Bischoff J,Motta A T,Comstock R J. Evolution of the Oxide Structure of 9CrODS Steel Exposed to Supercritical Water[J]. Journal of Nuclear Materials,2009,392(2) ：272-279.
[25 ] Tokei Z, Viefhaus H, Grabke H J. Initial Stages of Oxidation of a 9CrMoV-Steel: Role of Segregation and Martensite Laths [J] . Applied Surface Science,2000,165(1) ：23-33.
[26] Ennis P J, Quadakkers W J. Mechanisms of Steam Oxidation in High Strength Martensitic Steels[J]. International Journal of Pressure Vessels and Piping,2007,84( 1-2) ：75-81.