固定管板式换热器在运行过程中发生了角焊缝处泄露造成失效,利用光学显微镜、扫描电镜、X衍射以及化学分析等方法对换热管、管板以及焊缝区进行化学成分、显微组织、腐蚀形貌、腐蚀产物进行了分析.结果表明:换热管以及管板等化学成分符合标准要求,母材及热影响区为铁素体+珠光体,焊缝不同区域出现了马氏体以及贝氏体,裂纹周围管板侧和焊缝区的组织差别较大,焊缝区的应力集中以及壳程介质进入缝隙并在操作工艺条件下浓缩,形成高风险碱应力腐蚀敏感性,最终导致在马氏体或贝氏体含量较高的区域开始萌生裂纹并导致了自焊缝底部开裂向焊缝中心发展的裂纹,进而导致换热器角焊缝泄露.
参考文献
| [1] | 汪光胜,周晓燕,郭志军.乙苯换热器换热管与管板接头开裂失效分析[J].石油化工设备,2008(05):93-95. |
| [2] | A. Li;W. Wang;X. Wang .Fatigue and brittle fracture of carbon steel process pipeline[J].Engineering failure analysis,2005(4):527-536. |
| [3] | Li, H;Lin, J;Dean, TA;Wen, SW;Bannister, AC .Modelling mechanical property recovery of a linepipe steel in annealing process[J].International Journal of Plasticity,2009(6):1049-1065. |
| [4] | N. Eliaz;A. Shachar;B. Tal .Characteristics of hydrogen embrittlement, stress corrosion cracking and tempered martensite embrittlement in high-strength steels[J].Engineering failure analysis,2002(2):167-184. |
| [5] | Alp T;Dogan B;Davies T J .The effect of microstructure in the hydrogen embfittlement of gas pipeline steel[J].Journal of Materials Science,1987,22:2105-2112. |
| [6] | Hardie D;Charles E A;Lopez A H .Hydrogen embrittlement of high strength pipeline steels pipeline steels[J].Corrosion Science,2006,48:4378-4385. |
| [7] | Tawancy H M .Failure of hydrocracker heat exchanger tubes in an oil refinery by polythionic aid-stress corrosion cracking[J].ENGINEERING FAILURE ANALYSIS,2009,16:2091-2097. |
| [8] | 崔忠圻.金属学与热处理[M].北京:机械工业出版社,1989 |
| [9] | 毕宗岳,刘道新,李轩,井晓天,李周波.热处理对ERW焊缝沟槽腐蚀敏感行为的影响[J].材料热处理学报,2011(02):48-53,60. |
| [10] | API 581[Z]. |
| [11] | API 571[Z]. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%