Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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ROLE OF GRAIN BOUNDARY CARBIDES IN CRACKING BEHAVIOR OF Ni BASE ALLOYS

  • Hwang, Seong Sik (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Lim, Yun Soo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Sung Woo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Dong Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Hong Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
  • Received : 2012.02.16
  • Accepted : 2012.07.17
  • Published : 2013.02.25
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Abstract

The primary water stress corrosion cracking (PWSCC) of Alloy 600 in a PWR has been reported in the control rod drive mechanism (CRDM), pressurizer instrumentation, and the pressurizer heater sleeves. Recently, two cases of boric acid precipitation that indicated leaking of the primary cooling water were reported on the bottom head surface of steam generators (SG) in Korea. The PWSCC resistance of Ni base alloys which have intergranular carbides is higher than those which have intragranular carbides. Conversely, in oxidized acidic solutions like sodium sulfate or sodium tetrathionate solutions, the Ni base alloys with a lot of carbides at the grain boundaries and shows less stress corrosion cracking (SCC) resistance. The role of grain boundary carbides in SCC behavior of Ni base alloys was evaluated and effect of intergranular carbides on the SCC susceptibility were reviewed from the literature.

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References

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