Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Fatigue Crack Growth Behavior of Austenite Stainless Steel in PWR Water Conditions

모사원전환경에서 오스테나이트 스테인리스강의 피로균열성장 평가

  • Min, Ki-Deuk (Hanyang University, Division of materials science and engineering) ;
  • Lee, Bong-Sang (Korea Atomic Energy Research Institute, Nuclear Materials Research Division) ;
  • Kim, Seon-Jin (Hanyang University, Division of materials science and engineering)
  • 민기득 (한양대학교 신소재공학부) ;
  • 이봉상 (한국원자력연구원 재료안전연구부) ;
  • 김선진 (한양대학교 신소재공학부)
  • Received : 2015.02.13
  • Accepted : 2015.03.29
  • Published : 2015.04.27
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Abstract

Fatigue crack growth rate tests were conducted as a function of temperature, dissolved hydrogen (DH) level, and frequency in a simulated PWR environment. Fatigue crack growth rates increased slightly with increasing temperature in air. However, the fatigue crack growth rate did not change with increasing temperature in PWR water conditions. The DH levels did not affect the measured crack growth rate under the given test conditions. At $316^{\circ}C$, oxides were observed on the fatigue crack surface, where the size of the oxide particles was about $0.2{\mu}m$ at 5 ppb. Fatigue crack growth rate increased slightly with decreasing frequency within the frequency range of 0.1 Hz and 10 Hz in PWR water conditions; however, crack growth rate increased considerably at 0.01 Hz. The decrease of the fatigue crack growth rate in PWR water condition is attributed to crack closure resulting from the formation of oxides near the crack tips at a rather fast loading frequency of 10 Hz.

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