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

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	Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution
	Z. M. Zhang; J. Q. Wang; E. H. Han; W. Ke
	2012
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	28 期号:9 页码:785-792
摘要	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 degrees 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.
部门归属	[zhang, zhiming; wang, jianqiu; han, en-hou; ke, wei] chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;wang, jq (reprint author), chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;wangjianqiu@imr.ac.cn
关键词	Alloy 690tt Surface State Applied Stress Stress Corrosion Cracking Environmentally Assisted Cracking Short-circuit Diffusion High-temperature Water Chromium Depletion Pressurized-water Steam Initiation Oxidation Mechanism Nickel
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60477
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. M. Zhang,J. Q. Wang,E. H. Han,et al. Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution[J]. Journal of Materials Science & Technology,2012,28(9):785-792.
APA	Z. M. Zhang,J. Q. Wang,E. H. Han,&W. Ke.(2012).Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution.Journal of Materials Science & Technology,28(9),785-792.
MLA	Z. M. Zhang,et al."Effects of Surface State and Applied Stress on Stress Corrosion Cracking of Alloy 690TT in Lead-containing Caustic Solution".Journal of Materials Science & Technology 28.9(2012):785-792.