Cracking causes of 316L austenitic stainless steel caustic storage tank
摘 要
某核电站316L奥氏体不锈钢碱液储罐发生了泄漏,采用宏观观察、化学成分分析、金相检验、硬度测试及残余应力分析等方法对该储罐开裂原因进行了分析。结果表明:储罐内壁焊缝两侧出现与焊缝平行的环向裂纹和垂直的轴向裂纹,前者主要受焊接残余拉应力作用,后者主要受冷加工残余拉应力作用,两类裂纹均为碱致应力腐蚀开裂。
Abstract
The leakage of 316L austenitic stainless steel caustic storage tank occurred in a nuclear power plant. The cracking causes of the tank were analyzed by macroscopic observation, chemical composition analysis, metallographic testing, hardness testing and residual stress analysis. The results show that the annular cracks parallel to the welding seam and the axial cracks perpendicular to the welding seam were found on the inner wall of the storage tank. The annular cracks were mainly affected by the welding residual tensile stress, while the axial cracks were mainly affected by the cold worked residual tensile stress. These two kinds of cracks were both caustic induced stress corrosion crack.
中图分类号 TG142.1 DOI 10.11973/lhjy-wl202205006
所属栏目 质量控制与失效分析
基金项目
收稿日期 2021/7/5
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备注郭凯(1986-),男,高级工程师,主要从事核电站金属材料失效分析相关工作,56830981@qq.com
引用该论文: GUO Kai,LI Xingang,KONG Chenguang,ZHANG Zhiming. Cracking causes of 316L austenitic stainless steel caustic storage tank[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(5): 22~25
郭凯,李心刚,孔晨光,张志明. 316L奥氏体不锈钢碱液储罐开裂原因[J]. 理化检验-物理分册, 2022, 58(5): 22~25
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参考文献
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【3】李峰.304L在高温碱性溶液中应力腐蚀开裂的研究[D].南京:南京工业大学,2006.
【4】张志明,彭青娇,王俭秋,等.核用锻造态316L不锈钢在330℃碱溶液中应力腐蚀开裂行为研究[J].中国腐蚀与防护学报,2015,35(3):205-212.
【5】BERGE P,DONATI J R,PRIEUX B,et al.Caustic stress corrosion of Fe-Cr-Ni austenitic alloys[J].Corrosion,1977,33(12):425-435.
【6】YANG W,LU Z P,HUANG D L,et al.Caustic stress corrosion cracking of nickel-rich,chromium-bearing alloys[J].Corrosion Science,2001,43(5):963-977.
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【9】陈吉,孙海生,陈鹏,等.热网管道补偿器在高温蒸汽环境中的失效分析[J].腐蚀与防护,2013,34(6):552-556.
【10】YOU Y L,ZHANG Z,MA L N.Cracking analysis of 316L stainless steel lining plates in alkaline environments[J].Engineering Failure Analysis,2014,39:34-40.
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