모사원전환경에서 오스테나이트 스테인리스강의 피로균열성장 평가

서지정보

ㆍ발행기관 : 한국재료학회 ㆍ수록지정보 : 한국재료학회지 / 25권 / 4호
ㆍ저자명 : 민기득, 이봉상, 김선진

목차

Abstract
1. 서 론
2. 실험 방법
2.1 환경피로시험기 설계조건
2.2 수화학 루프 및 피로시험장치
2.3 재료 및 시편
2.4 피로균열성장률평가
2.5 피로균열파면 분석
3. 실험 결과
3.1 인장특성
3.2 피로균열성장률
3.3 피로파면 관찰
4. 고 찰
4.1 항복강도의 영향
4.2 산화물의 영향
4.3 Frequency의 영향
5. 결 론
Acknowledgement
References

영어 초록

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 oC, oxides were observed on the fatigue crack surface, where the size of the oxide particles was about 0.2 μm 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.

참고 자료

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