表面状态和施加应力对690TT合金在高温含铅苛性环境中的应力腐蚀开裂行为的影响

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (9): 785-792.

表面状态和施加应力对690TT合金在高温含铅苛性环境中的应力腐蚀开裂行为的影响

张志明¹,王俭秋²,²,韩恩厚³,柯伟¹

1. 中国科学院金属研究所
2. 金属所
3. 中国科学院金属研究所腐蚀与防护国家重点实验室

收稿日期:2011-06-24 修回日期:2011-08-16 出版日期:2012-09-28 发布日期:2012-09-28
通讯作者: 王俭秋
基金资助:
国家重点基础研究发展计划项目;国家自然科学基金

Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution

Zhiming Zhang, Jianqiu Wang, En-Hou Han, Wei Ke

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2011-06-24 Revised:2011-08-16 Online:2012-09-28 Published:2012-09-28
Contact: Jianqiu WANG
Supported by:
the National Science and Technology Major Project (No. 20112x06004-009) and the National Natural Science Foundation of China (No. 51025104)

摘要/Abstract

摘要：

文章采用具有四种表面状态和两种应力水平的C形环样品，研究了表面状态和施加应力对690TT合金在330 ℃、含100 mg/L PbO的10wt.%氢氧化钠溶液中的应力腐蚀开裂行为的影响。前三种样品的外表面分别为打磨至400#，表面喷丸处理和表面电解抛光处理；第四种样品的外表面为原始态。同一表面状态的两个样品分别加载至690TT合金的一倍和两倍屈服强度。实验结果表明，在实验溶液中690TT合金表面生长的氧化膜有三层构成，但并没有发现连续的富Cr层。氧化膜与基体之间弱的结合力表明该氧化膜不能对基体起到很好的保护作用。在氧化膜和裂纹路径氧化物中均发现了Pb的存在；Pb促进了这些这些位置及基体中的热力学不稳定的Cr的溶解。与原始态样品相比较，表面喷丸和电解抛光处理可以有效地降低690TT合金在实验溶液中的应力腐蚀裂纹萌生和扩散速度，而表面打磨处理却可以促进这一过程。随对样品施加应力的增加，690TT合金的应力腐蚀开裂程度逐渐增加。样品表面冷加工和较高的施加应力，促进了基体中Cr的溶解，且引起局部的张应力集中，进而降低了690TT合金在实验溶液中的应力腐蚀开裂的抗力。

Abstract:

The effects of surface state and applied stress on the stress corrosion cracking (SCC) behaviors of thermally treated (TT) Alloy 690 in 10 wt% NaOH solution with 100 mg/L litharge at 330 °C were investigated using C-ring samples with four kinds of surface states and two different stress levels. Sample outer surfaces of the first three kinds were ground to 400 grit (ground), shot-peened (SP) and electro-polished (EP) and the last one was used as the as-received state. Two samples of every kind were stressed to 100% and 200% yield stress of Alloy 690TT, respectively. The results showed that the oxide film consisted of three layers whereas continuous layer rich in Cr was not found. The poor adhesive ability indicated that the oxide film could not protect the matrix from further corrosion. Lead was found in the oxide film and the oxides at the crack paths and accelerated the dissolution of thermodynamically unstable Cr in these locations and also in the matrix. The crack initiation and propagation on Alloy 690TT were effectively retarded by SP and EP treatments but were enhanced by grinding treatment, compared with the cracks on the as-received surface. The cracking severity was also enhanced by increasing the externally applied stress. The accelerated dissolution of Cr and the local tensile stress concentration in the near-surface layer caused by cold-working and higher applied stress reduced the SCC-resistance of Alloy 690TT in the studied solution.

Key words: Alloy 690TT, Surface state, Applied stress, Stress corrosion cracking

张志明王俭秋韩恩厚柯伟. 表面状态和施加应力对690TT合金在高温含铅苛性环境中的应力腐蚀开裂行为的影响[J]. J. Mater. Sci. Technol., 2012, 28(9): 785-792.

Zhiming Zhang, Jianqiu Wang, En-Hou Han, Wei Ke. Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution[J]. J. Mater. Sci. Technol., 2012, 28(9): 785-792.

参考文献

[1 ] J.J. Kai, G.P. Yu, C.H. Tsai, M.N. Liu and S.C. Yao: Metall. Mater. Trans. A, 1989, 20, 2057.

[2 ] G.P. Yu and H.C. Yao: Corrosion, 1990, 46, 391.

[3 ] R.G. Ballinger: in Proc. 5th IMR Symp. on Materials Science and Engineering, Shenyang, China, 2009, 50.

[4 ] Materials Reliability Program: Resistance to Primary Water Stress Corrosion Cracking of alloys 690, 52, and 152 in Pressurized Water Reactors (MRP-111), EPRI, Palo Alto, CA, U.S. Department of Energy, Washington, DC, 2004, No. 1009801.

[5 ] P.E. MacDonald, V.N. Shah, L.W. Ward and P.G. Ellison: Steam Generator Tube Failures, NUREG/CR-6365, Washington, DC, Prepared for U.S. Nuclear Regulatory Commission, 1996, 108.

[6 ] R.W. Staehle and J.A. Gorman: Corrosion, 2003, 59, 931.

[7 ] F.J. Meng, J.Q. Wang, E.H. Han and W. Ke: Corros. Sci., 2009, 51, 2761.

[8 ] S. Wang, Y. Takeda, K. Sakaguchi and T. Shoji: Corrosion, 2006, 62, 651.

[9 ] S.Wang, T. Shoji and N. Kawaguchi: Corrosion, 2005, 61, 137.

[10] S. Le Hong: Corrosion, 2001, 57, 323.

[11] J.M. Boursier: Stress Corrosion Cracking of NickelBased Alloys in Primary Water of Pressurized Water Reactors, Ph.D. Thesis, University of Bordeaux I, 1993.

[12] F. Scenini, R.C. Newman, R.A. Cottis and R.J. Jacko: Corrosion, 2008, 64, 824.

[13] D.H. Hur, M.S. Choi, D.H. Lee, M.H. Song, S.J. Kim and J.H. Han: Nucl. Eng. Des., 2004, 227, 155.

[14] I.G. Park: Nucl. Eng. Des., 2002, 212, 395.

[15] P.M. Scott: Corros. Sci., 1985, 25, 583.

[16] P. Combrade, P.M. Scott, M. Foucault, E. Andrieu and P. Marcus: in Proc. of 12th Int. Conf. on Environmental Degradation of Materials in Nuclear Power System-Water Reactors, eds T.R. Allen, P.J. King, and L. Nelson, TMS (The Minerals, Metals & Materials Society), Salt Lake City, Utah, 2005, 883.

[17] F. Carrette, M.C. Lafont, G. Chatainier, L. Guinard and B. Pieraggi: Surf. Interface Anal., 2002, 34, 135.

[18] Z.M. Zhang, J.Q. Wang, E.H. Han and W. Wei: J. Mater. Sci. Technol., 2012, 28, 353.

[19] B. Peng, B.T. Lu, J.L. Luo, Y.C. Lu and H.Y. Ma: J. Nucl. Mater., 2008, 378, 333.

[20] Y.S. Hu: Corrosion Behaviors of Alloy 690TT in High Temperature Caustic Solution Containing-Lead, Ph.D. Thesis, Institute of Metal Research, Chinese Academy of Sciences, 2010. (in Chinese)

[21] B.P. Miglin, J.M. Sarver and M.J. Rowski: in Proc. of Improving the Understanding and Control of Corrosion on the Secondary Side of Steam Generators, Airlie, Virginia, US, 1995, 305.

[22] S.S. Hwang, H.P. Kim, Y.S. Lim, J.S. Kim and L. Thomas: Corros. Sci., 2007, 49, 3797.

[23] S. Ahn , V.S. Rao, H. Kwon and U. Kim: Corros. Sci., 2006, 48, 1137.

[24] T.C. Dan: Effects of Hydrogen and Lead on the Stress Corrosion Cracking of Alloy 690 in High-Temperature Water, Ph.D. Thesis, Institute of Metal Research, Chinese Academy of Sciences, 2010. (in Chinese)

[25] R. Peraldi, D. Monceau and B. Pieraggi: Oxid. Met., 2002, 58, 249.

[26] H.V. Atkinson: Oxid. Met., 1985, 24, 177.

[27] R. Herchel, N.N. Khoi, T. Homma and W.W. Smeltzer: Oxid. Met., 1972, 4, 35.

[28] F.J. Meng, E.H. Han, J.Q. Wang, Z.M. Zhang and W. Ke: Electrochim. Acta, 2011, 56, 1781.

[29] E.M. Gutman: Mechanochemistry of Solid Surfaces, World Scienti¯c Publication, New Jersey, Singapore, London, 1994, 332.

[30] N. Winzer, A. Atrens, W. Dietzel, G.L. Song and K.U. Kainer: Mater. Sci. Eng. A, 2007, 466, 18.

[31] J. Chen, M.R. Ai, J.Q. Wang, E.H. Han and W. Ke: Corros. Sci., 2009, 51, 1197.

[32] J.R. Galvele: Corrosion, 1987, 27, 1.