热网管道补偿器在高温蒸汽环境中的失效分析
Failure Analysis of Thermal Network Compensator in High-temperature Caustic Environment
摘 要
某热电厂的热网蒸汽管道补偿器由Incoloy825合金(内层)和316L不锈钢(外层)构成。在锅炉非正常停车后又恢复运行的过程中管道补偿器波纹管波峰处发生开裂。采用金相、断口、能谱分析等手段对补偿器的失效进行了全面的分析。结果表明, 在高温碱性环境下, 由于补偿器波纹管波峰处拉应力最大, 在此处发生了碱应力腐蚀开裂, 从而导致了补偿器的失效。
Incoloy825合金
316L不锈钢
碱应力腐蚀
steam pipe compensator
Incoloy825 alloy
316L stainless steel
caustic stress corrosion
Abstract
A steam pipe compensator of thermal network consists of Incoloy825 alloy (inner layer) and 316L stainless steel (outer layer). The crest of bellows of the compensator cracked during the start of boiler after a abnormal stop. A comprehensive research on the failed reason of the compensator was carried out by metallography, SEM and EDS, etc. The results showed that caustic stress corrosion cracking occurred at the crest of bellows of the compensator, in which the tensile stress was the largest.
中图分类号 TG172.3
所属栏目 失效分析
基金项目
收稿日期 2012/7/21
修改稿日期
网络出版日期
作者单位点击查看
备注关凯书, 教授,博士生导师,
引用该论文: CHEN Ji,SUN Hai-sheng,CHEN Peng,GUAN Kai-shu. Failure Analysis of Thermal Network Compensator in High-temperature Caustic Environment[J]. Corrosion & Protection, 2013, 34(6): 552
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参考文献
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【2】黄德伦, 孙德生, 杨武.冷加工对800合金抗碱性应力腐蚀破裂的影响[J].腐蚀与防护, 1997, 18(6): 249-252.
【3】陈荣, 潘红良.Incoloy825合金腐蚀原因分析[C]//中国化工学会2008年化工机械年会. 上海:[s.n.],2008:705-708.
【4】Shalaby H M, Riad W T, Alhazza A A.Incoloy825锅炉管在高温碱性盐中的应力腐蚀破裂[C]//2002中国国际腐蚀控制大会论文集. 北京:[s.n.],2002: 311-314.
【5】张菽浪, 张红斌.Incoloy825耐蚀合金[J].特钢技术, 2005, 10(3): 64-66.
【6】Wilson I L, Pement F N, Aspde R G. Caustic stress corrosion behavior of Fe-Ni-Cr nuclear steam generator tubing alloys[J].Nuclear Technology,1976,31(1):70-84.
【7】Pathania R S, Cleland D. The effect of thermal treatments on stress corrosion cracking of Alloy-800 in a caustic environment[J].Corrosion,1985,41(10): 575-581.
【8】黄春波, 吕战鹏, 杨武.Fe-Cr-Ni合金碱性应力腐蚀破裂[J].腐蚀与防护, 2002, 23(6): 239-244.
【9】Hickling J, Wieling N. Electrochemical aspects of the stress corrosion cracking of Fe-Cr-Ni alloys in caustic solutions[J].Corrosion Science,1987,20(2):269-279.
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