| 换热器波纹管失效分析 |
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| 引用本文： | 王春晖. 换热器波纹管失效分析[J]. 失效分析与预防, 2010, 5(2): 98-101,118. DOI: 10.3969/j.issn.1673-6214.2010.02.009 |
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| 作者姓名： | 王春晖 |
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| 作者单位： | 沈阳化工学院,沈阳,110142 |
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| 摘 要： | 某种换热器的主要换热元件波纹管使用后发生严重损坏。采用光学显微镜、扫描电镜和X射线能谱（EDS）等手段对失效波纹管进行断口宏、微观分析、能谱分析、金相检验及化学成分分析,以确定其失效原因。结果表明：该波纹管的失效性质为应力腐蚀,波纹管断口形貌以沿晶断裂为主,断口上可见明显的腐蚀产物,断口内壁有明显的腐蚀坑和由腐蚀坑发展的裂纹,能谱分析结果表明断口腐蚀产物中含有一定量的S和Cl元素;分析认为波纹管在加工过程中的残余应力和使用环境中的Cl-是导致其发生应力腐蚀的主要原因,此外材料中Cr含量偏低也是导致其发生应力腐蚀的另一原因。
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| 关 键 词： | 波纹管 应力腐蚀 残余应力 腐蚀介质 腐坑 |
Failure Analysis of Metal Bellows in Heat-exchanging Unit |
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| WANG Chun-hui. Failure Analysis of Metal Bellows in Heat-exchanging Unit[J]. Failure Analysis and Prevention, 2010, 5(2): 98-101,118. DOI: 10.3969/j.issn.1673-6214.2010.02.009 |
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| Authors: | WANG Chun-hui |
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| Affiliation: | WANG Chun-hui(Shenyang University of Chemical Technology,Shenyang 110142,China) |
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| Abstract: | The metal bellows,a main component of the heat-exchanging unit,was seriously damaged after serving for a period.In order to find out the failure mode and cause of the bellows,fracture surface observation,EDS analysis,metallurgical structure examination,and chemical composition analysis were carried out.The results show that the failure of the bellows was caused by stress corrosion.Intergranular cracking is the main feature of the fracture surface.Corrosion products were found on the fracture surface,and cor... |
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| Keywords: | metal bellows stress corrosion residual stress corrosion medium corrosion pit |
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