Journal of Mechanical Engineering >

2018 , Vol. 54 >Issue 14: 43 - 49

DOI: https://doi.org/10.3901/JME.2018.14.043

Corrosion Fatigue Behavior of FV520B Steel in Aqueous H2S+Cl- Environment

  • WEI Renchao ,
  • CHEN Xuedong ,
  • FAN Zhichao ,
  • NIE Defu ,
  • WU Qiaoguo ,
  • JIN Youhai
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  • 1. College of Chemical Engineering, China University of Petroleum(Huadong), Qingdao 266580;
    2. National Technology Research Center Vessel and Pipeline Safety Engineering, Hefei General Machinery Research Institute Co. Ltd., Hefei 230031

Received date: 2017-08-21

  Revised date: 2018-03-26

  Online published: 2018-07-20

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Abstract

In order to investigate the fatigue life of centrifugal compressor impeller, corrosion fatigue tests of FV520B stainless steel in air and aqueous H2S+Cl- environment are carried out. The corrosion fatigue failure mechanism of FV520B steel is analyzed combining with the fracture morphology observation and a modified fatigue life prediction model is built. The results demonstrate that corrosion fatigue lives of FV520B steel aqueous H2S+Cl- environment are dramatically decreased compare with those in air and decreased further with the increasing of H2S. Corrosion fatigue damages caused by hydrogen emerge gradually when the applied stress amplitude is relatively low and increased with the decreasing of applied stress amplitude. Microstructure observation revealed that corrosion pits are found on the surface of the specimens and the fatigue cracks are initiated on the surface of the specimens in all corrosion mediums and then propagated. Considering the effect of hydrogen on fatigue behavior of FV520B steel, a modified fatigue life prediction model is proposed on the basis of pitting corrosion mechanism. The model predictions are in good agreement with the test results, which can provide some insight into fatigue life prediction of materials exposed to aqueous H2S+Cl- environment.

Key words： FV520B stainless steel; aqueous H2S+Cl-; corrosion fatigue; pitting corrosion

Cite this article

WEI Renchao , CHEN Xuedong , FAN Zhichao , NIE Defu , WU Qiaoguo , JIN Youhai . Corrosion Fatigue Behavior of FV520B Steel in Aqueous H2S+Cl- Environment[J]. Journal of Mechanical Engineering, 2018 , 54(14) : 43 -49 . DOI: 10.3901/JME.2018.14.043

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