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中国腐蚀与防护学报  2015, Vol. 35 Issue (3): 189-198    DOI: 10.11902/1005.4537.2014.101
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核电异种金属焊接接头的应力腐蚀裂纹扩展行为研究进展
朱若林,张志明,王俭秋(),韩恩厚
Review on SCC Crack Growth Behavior of Dissimilar Metal Welds for Nuclear Power Reactors
Ruolin ZHU,Zhiming ZHANG,Jianqiu WANG(),En-Hou HAN
Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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摘要: 

综述了轻水堆核电站大型容器壳体与主管道连接部位中异种金属焊接接头应力腐蚀裂纹扩展行为的研究进展,阐述了国内外关于材料、应力、环境等多种因素对应力腐蚀裂纹扩展行为的影响,并对需要进一步研究的方向进行了展望。
关键词 ： 轻水堆,  异种金属焊接,  应力腐蚀,  裂纹扩展,  高温高压水    
Abstract：

Recent progress on stress corrosion cracking (SCC) crack growth behavior of dissimilar metal welds between reactor pressure vessel and reactor coolant piping is reviewed in this paper. The worldwide studies concerning the effect of materials, stress and environmental conditions on SCC crack growth behavior are described. Meanwhile, the direction of further research is also forecasted.
Key words： light water reactor    dissimilar metal weld    stress corrosion crack    crack growth    high temperature and high pressure water
    
基金资助:国家科技重大专项项目 (2011ZX06004009) 和国家自然科学基金项目 (51025104) 资助
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朱若林,张志明,王俭秋,韩恩厚. 核电异种金属焊接接头的应力腐蚀裂纹扩展行为研究进展[J]. 中国腐蚀与防护学报, 2015, 35(3): 189-198.
Ruolin ZHU, Zhiming ZHANG, Jianqiu WANG, En-Hou HAN. Review on SCC Crack Growth Behavior of Dissimilar Metal Welds for Nuclear Power Reactors. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 189-198.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.101      或      https://www.jcscp.org/CN/Y2015/V35/I3/189

图1  喷管和管道异种金属焊接位置的典型示意图[2]
图2  反应堆容器顶部J型坡口焊接示意图[3]
图3  182/82焊接合金分布图[3]
图4  退火态 (或焊后) 材料SCC沿晶开裂形貌[8]
Plant Inspection date Nozzle Type of indication Indication depth a / cm OD indication length l / cm a: thickness l: circumference
Calvert cliffs 2 2005 CL drain Cric 0.142 1.595 10% 10%
Calvert cliffs 2 2005 HL drain Axial 0.996 0.000 70% 0%
DC cook 2005 Safety Axial 3.129 0.000 88% 0%
Calvert cliffs 1 2006 HL drain Cric 0.254 1.143 19% 5%
Calvert cliffs 1 2006 Relief Axial 0.254 0.000 8% 0%
Calvert cliffs 1 2006 Surge Circ 1.016 6.096 25% 6%
Davis besse 2006 CL drain Axial 0.142 0.000 7% 0%
San onofre 2 2006 Safety Axial 1.067 0.000 30% 0%
San onofre 2 2006 Safety Axial 1.067 0.000 30% 0%
Wolf creek 2006 Relief Cric 0.864 29.210 25.8% 46%
Wolf creek 2006 Safety Cric 0.754 6.350 22.5% 10%
Wolf creek 2006 Surge Cric 1.181 22.225 32.1% 19%
Farley 2 2007 Surge Circ 1.270 7.620 33% 6%
Davis besse 2008 --- Axial --- --- --- ---
Crystal river 3 2008 --- Cric --- --- --- ---
表1  2005年至2008年上半年在反应堆一回路循环冷却水中, 182/82合金对接焊焊件检测出裂纹情况[16]
图5  SCC裂纹到达融合线之前沿I型和II型晶界生长和裂纹生长至融合线处的SEM像[25]
图6  300 ℃时Ni-H2O的Pourbaix图[53]
图7  溶解氢对镍基合金在高温水中裂纹扩展速率的影响[53]
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