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Journal of Failure Analysis and Prevention

, Volume 19, Issue 1, pp 29–35 | Cite as

Stress Corrosion Cracking of an Electrohydraulic Oil Pipe

  • Nan Li
  • Ning DingEmail author
  • Long Liu
  • Songqing Hu
  • Shuangqing Sun
  • Shen Qu
  • Chi-Man Lawrence Wu
Case History---Peer-Reviewed
  • 27 Downloads

Abstract

Cracking of an oil inlet pipe in an electrohydraulic governing system was detected and analyzed to determine its failure mechanism. Microscopic analysis methods, such as the scanning electron microscopy and energy-dispersive X-ray spectrum, were applied to obtain the effective information. Visual and micro-examination showed that the pipe suffered a brittle cracking at the elbow part. Corrosion pits and branched cracks had formed in the outer surface of the pipe. The element of chlorine was detected both in the corrosion pits and the corrosion products inside the cracks. In addition, the cracks were found initiating from the bottom of the corrosion pit. Transgranular cracking feature was identified for the cracks. All the collected evidences suggested that the EH oil pipe fractured due to the combination of a chloride pitting corrosion and a stress corrosion cracking failure.

Keywords

Stress corrosion cracking Pitting corrosion EH oil pipe Austenitic stainless steel Failure mechanism 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11404192 and 11605106), the Key Research and Development Project of Shandong Province, China (Grant No. 2017GSF220004), the Shandong Province Special Grant for High-Level Talents (Taishan Scholar), and the research fund of Shandong Academy of Sciences (Grant Nos. 2017QN001 and KJHZ201805).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Nan Li
    • 1
  • Ning Ding
    • 1
    Email author
  • Long Liu
    • 1
  • Songqing Hu
    • 2
  • Shuangqing Sun
    • 2
  • Shen Qu
    • 3
  • Chi-Man Lawrence Wu
    • 4
  1. 1.Engineering Research Center of Failure Analysis and Safety Assessment, Shandong Analysis and Test CenterQilu University of Technology (Shandong Academy of Sciences)JinanPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringChina University of Petroleum (East China)QingdaoPeople’s Republic of China
  3. 3.Failure Analysis Center, Institute of Metal ResearchChinese Academy of SciencesShenyangPeople’s Republic of China
  4. 4.Department of Physics and Materials ScienceCity University of Hong KongHong Kong SARPeople’s Republic of China

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