Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Fatigue Crack Growth Characteristics of the Pressure Vessel Steel SA 508 Cl. 3 in Various Environments

  • Lee, S. G. (Korea Advanced Institute of Science and Technology) ;
  • Kim, I. S. (Korea Advanced Institute of Science and Technology) ;
  • Park, Y. S. (Korea Electric Power Research Institute) ;
  • Kim, J. W. (Korea Electric Power Research Institute) ;
  • Park, C. Y. (Korea Electric Power Research Institute)
  • Published : 2001.10.01
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Abstract

Fatigue tests in air and in room temperature water were performed to obtain comparable data and stable crack measuring conditions. In air environment, fatigue crack growth rate was increased with increasing temperature due to an increase in crack tip oxidation rate. In room temperature water, the fatigue crack growth rate was faster than in air and crack path varied on loading conditions. In simulated light water reactor (LWR) conditions, there was little environmental effect on the fatigue crack growth rate (FCGR) at low dissolved oxygen or at high loading frequency conditions. While the FCGR was enhanced at high oxygen condition, and the enhancement of crack growth rate increased as loading frequency decreased to a critical value. In fractography, environmentally assisted cracks, such as semi-cleavage and secondary intergranular crack, were found near sulfide inclusions only at high dissolved oxygen and low loading frequency condition. The high crack growth rate was related to environmentally assisted crack. These results indicated that environmentally assisted crack could be formed by the Electrochemical effect in specific loading condition.

Keywords

References

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