Isothermal oxidation behavior of Cr20Ni80 alloy at 1 200 ℃
WANG Xiao- jun1, LIANG Hai- zhi1, NAN Hong- qiang2, DONG Sheng- mao2
1. College of Materials Science and Engineering, Lanzhou University of Technology,Lanzhou 730050, Gansu, China 2. Jinchuan Group Co. , Ltd. , Jinchang 737104，Gansu, China
Abstract：The isothermal oxidation behavior of Cr20Ni80 electrothermal alloy in air at 1 200 ℃ was studied with static oxidation method. The paperless recorder were used to record the variation of the voltage and current between the two ends of wire, and SEM and XRD to analyze cross section morphology, phase composition on the surface and the distribution of elements in the oxide layer of Cr20Ni80 after heating 60 h, 120 h. The results show that oxidation process of Cr20Ni80 alloy at 1 200 ℃ may be divided into 3 stages. Oxidation products is made up of 3 layers in 60 h: the outermost layer including NiO and NiCr2O4 and almost peeling off, the middle one being Cr2O3, and the inner one being SiO2. Oxidation comes to the third stages after heating 120 h. At this time, the oxide film has peeled completely and Cr20Ni80 alloy wire is about to break.
[1] 樊勇军, 周晓龙, 曹建春, 等.Cr20Ni80 合金的使用性能及其影响因素[J]. 热加工工艺, 2013, 42(20):33-36.[2] 李亚敏, 龚乃国. Cr20Ni80 电热合金高温压缩过程中的组织演变[J]. 锻压技术, 2015, 40(1):121-124. [3] Zheng L, Zhang M C, Chellali R, Bouchikhaoui H, Dong J X. Oxidation property of powder metallurgy EP741NP Ni based superalloy at elevated temperatures [J]. Materals Technology, 2013,28(3):123.[4] Gupta O P, Mudgal D, Puri D, Prakash S. High temperature cyclic oxidation of Ni based superalloys at 900 ℃in air [J]. International Journal of Advanced Scientific Research and Technology, 2012,2(2): 486.[5] 邹兴政, 南宏强, 韩 磊. 电热合金的研究现状及发展趋势[J]. 铸造技术, 2009, 30(4):554-556.[6] 刘天佐, 刘 娜, 沈 婕, 等. 影响 Cr20Ni80 电热合金使用寿命因素的研究现状[J]. 有色金属, 2010, 62(4):34-36.[7] 王海涛. 复合氧化膜对铁基高温合金抗氧化性能影响与机理研究[D]. 山东大学, 2010.[8] 陈鹏, 程玉贵, 夏玉恒. 800 MW机组锅炉过热器氧化膜脱落原因分析及对策[J]. 东北电力技术, 2008(7):43-46.[9] 范金鑫, 张继祥, 陆燕玲,等. 新型低 Cr 镍基合金 GH3535 高温氧化行为[J]. 稀有金属, 2015, 39(5):399-404.[10] 陈 阳, 吴树森, 刘龙飞. 一种铸造镍基高温合金的氧化行为[J]. 铸造, 2014, 63(1):62-66.[11] 李维银, 刘红飞, 赵双群. 新型镍基高温合金 950 ℃氧化行为的研究[J]. 材料热处理学报, 2008, 29(3):26-29.[12] 初 蕾, 刘英才, 梁丹维. Si含量对镍基合金氧化保护膜影响机制的研究[J]. 中国海洋大学学报, 2011, 41(5):291-293.[13] Park S H, Lee Y Y, Lee Y D, et al. Newcomb S B, Little J A, editors[M]. Microscopy of oxidation 3. London: Institute of Materials, 1997.[14] Bamba G, Wouters Y, Galerie A, et al.Thermal oxidation kinetics and oxide scale adhesion of Fe-15Cr alloys as a function of their silicon content [J]. Acta Materialia, 2006(54):3917-3922.
2017, Vol. 24 
