Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Applied Potential on Fatigue Crack Propagation Behavior of API X80 Steel in Seawater

  • Kim, Youngju (Korea Institute of Geoscience & Mineral Resources, Mineral Resources Research Division) ;
  • Kwon, Jaeki (Korea Institute of Geoscience & Mineral Resources, Mineral Resources Research Division) ;
  • Jeong, Daeho (Gyeongsang National University, ReCAPT, Department of Materials Science and Engineering) ;
  • Woo, Namsub (Korea Institute of Geoscience & Mineral Resources, Mineral Resources Research Division) ;
  • Goto, Masahiro (Oita University, Department of Mechanical Engineering) ;
  • Kim, Sangshik (Gyeongsang National University, ReCAPT, Department of Materials Science and Engineering)
  • Received : 2013.12.07
  • Accepted : 2014.01.23
  • Published : 2014.09.20
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Abstract

In the present study, the fatigue crack propagation (FCP) tests were conducted on X80 steel in air and artificial seawater (ASW) under various applied potentials to establish optimum and safe working limits of cathodic protection (CP). The slow strain rate test (SSRT) was also conducted on the X80 BM specimens in ASW under CP potential to identify the susceptibility of hydrogen affecting the FCP behavior. The CP potential of -850 and $-1,050mV_{SCE}$ suppressed the environmental effect of seawater on the FCP behavior of X80 BM and WM specimens, showing almost identical da/dN-${\Delta}K$ curves for both air and ASW environments. The SSRT in ASW under CP potential of $-1,050mV_{SCE}$ suggested that the X80 BM specimen steel is susceptible to hydrogen embrittlement, but the effect of hydrogen was believed to be marginal in affecting the FCP behavior of the X80 specimens at a loading frequency of 10 Hz. The FCP behavior of high strength X80 steel is discussed based on the fractographic observation to understand the FCP mechanism in seawater under various CP potentials.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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