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http://dx.doi.org/10.3740/MRSK.2015.25.4.183

Fatigue Crack Growth Behavior of Austenite Stainless Steel in PWR Water Conditions  

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)
Publication Information
Korean Journal of Materials Research / v.25, no.4, 2015 , pp. 183-190 More about this Journal
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.
Keywords
type 347 stainless steel; environmental fatigue; PWR environment; fatigue crack growth rate;
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