Reasons Analysis on Cracking of Welding Seam of Drain Pipe of Stem Turbine Extraction
摘 要
某电厂汽轮机二级抽汽疏水管在运行过程中于焊缝处发生开裂。采用宏观分析、化学成分分析、金相检验、扫描电镜分析等方法对疏水管焊缝开裂原因进行了分析。结果表明: 由于该疏水管直管和弯管对接焊后未进行去应力焊后热处理, 焊缝处残余应力较高; 在焊接残余应力、工作应力及氯离子的共同作用下, 疏水管焊缝内壁萌生裂纹, 裂纹由管内壁向外壁不断扩展, 最终导致疏水管发生应力腐蚀开裂。
Abstract
Cracking leakage failure occurred at the welding seam of drain pipe of a steam turbine extraction in a power plant. By means of visual examination, chemical compositions analysis, metallographic examination and SEM analysis, the welding seam cracking reasons were analyzed. The result show that the welding seam contained high content of Cl and no post weld heat treatment implemented. By the combined action of Cl, residual stress and actual working stress, cracks emerged from inner wall of the drain pipe at the welding seam, and the cracks extended continuously from inner wall to outer wall which finally resulted in stress corrosion cracking of the drain pipe.
中图分类号 TG172.8
所属栏目 质量控制与失效分析
基金项目 大型先进压水堆核电站重大专项资助项目(2011ZX06004-009-0902)
收稿日期 2012/8/18
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备注方可伟(1984-),男,硕士。
引用该论文: FANG Ke-wei,LUO Kun-jie,LI Yan,LIU Fei-hua. Reasons Analysis on Cracking of Welding Seam of Drain Pipe of Stem Turbine Extraction[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2013, 49(2): 123~126
方可伟,罗坤杰,李岩,刘飞华. 汽轮机抽汽疏水管焊缝开裂原因分析[J]. 理化检验-物理分册, 2013, 49(2): 123~126
被引情况:
【1】金林奎,周春华,袁裕光, "20CrMnTi钢输出轴断裂原因分析",理化检验-物理分册 52, 142-145(2016)
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参考文献
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【3】FRANKEL G S. Pitting corrosion of metals:A review of the critical factors[J]. Journal of the Electrochemical Society,1998,145(6):2186-2198.
【4】LU B T,CHEN Z K,LUO J L,et al. Pitting and stress corrosion cracking behavior in welded austenitic stainless steel[J]. Electrochimica Acta,2005,50(6):1391-1403.
【5】ZUCCHI F,TRABANELLI G,GRASSI V. Pitting and stress corrosion cracking resistance of friction stir welded AA5083[J]. Materials and Corrosion,2001,52(11):853-859.
【6】夏兰廷,王录才,黄桂桥. 我国金属材料的海水腐蚀研究现状[J]. 中国铸造装备与技术,2002,37(6):1-4.
【7】黄锦花,李自刚,钱余海. 低合金耐海水腐蚀钢在模拟腐蚀环境下的耐蚀性能研究[J]. 上海金属,2006,28(4):6-8.
【8】KIM Y J. Characterization of the oxide film formed on type 316 stainless steel in 288 ℃ water in cyclic normal and hydrogen water chemistries[J]. Corrosion,1995,51(11):849-860.
【9】KIM Y J. Analysis of oxide film formed on type 304 stainless steel in 288 ℃ water containing oxygen,hydrogen,and hydrogen peroxide[J]. Corrosion,1999,55(01):81-88.
【10】KUMAI C S,DEVINE T M. Influence of oxygen concentration of 288 ℃ water and alloy composition on the films formed on Fe-Ni-Cr alloys[J]. Corrosion,2007,63(12):1101-1113.
【11】FRANKEL G S. Pitting corrosion of metals:A review of the critical factors[J]. Journal of the Electrochemical Society,1998,145(6):2186-2198.
【12】LU B T,CHEN Z K,LUO J L,et al. Pitting and stress corrosion cracking behavior in welded austenitic stainless steel[J]. Electrochimica Acta,2005,50(6):1391-1403.
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