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

doi:10.3901/JME.2018.14.043

Abstract

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: aqueous H₂S+Cl^-, corrosion fatigue, FV520B stainless steel, pitting corrosion

CLC Number:

TG113

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.

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

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