Fatigue crack growth behavior of reactor pressure vessel steels in air and high-temperature water environments |
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Authors: | J.Y. Huang J.J. YehR.C. Kuo S.L. JengM.C. Young |
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Affiliation: | Institute of Nuclear Energy Research (INER), P.O. Box 3-14, 1000 Wenhua Road, Chiaan Village, Lungtan 325, Taiwan, ROC |
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Abstract: | Fatigue tests under constant amplitude load were conducted on CT specimens of A533B3 steels with four levels of sulfur content at different temperatures in air and high-temperature water environments. A modified capacitance-type COD gauge was shown to be suitable for fatigue crack length measurement at high temperatures in air. The observation that the Young's moduli measured at a strain rate of 4 × 10−3 s−1 for the A533B3 steels at 150 °C and 300 °C did not decrease with an increase in temperature seemed to be related to the presence of dynamic strain aging. The fatigue crack growth rates at 150 °C and 300 °C in air were about two and half times slower than those tested at 400 °C, because dynamic strain aging prevailed at 150 °C and 300 °C. Fractographic examination results suggested that inclusions embedded in secondary cracks enhanced the fatigue crack initiation rather than the fatigue crack growth. The fatigue crack growth rates taken in the oxygen-saturated water environment were one order of magnitude faster than those obtained in air. |
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Keywords: | Fatigue crack growth ACPD technique Capacitance-type COD gauge Dynamic strain aging Water chemistry |
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