Fatigue crack growth behavior of austenite stainless steel in PWR water conditions

Title
Fatigue crack growth behavior of austenite stainless steel in PWR water conditions
Other Titles
모사원전환경에서 오스테나이트 스테인리스강의 피로균열성장 평가
Author
김선진
Keywords
type 347 stainless steel; environmental fatigue; PWR environment; fatigue crack growth rate
Issue Date
2015-03
Publisher
Materials Research Society of Korea
Citation
Korean Journal of Materials Research, v. 25, NO 4, Page. 183-190
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 ∘ C 316∘C , oxides were observed on the fatigue crack surface, where the size of the oxide particles was about 0.2μm 0.2μm 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.
URI
http://db.koreascholar.com/article?code=294281http://hdl.handle.net/20.500.11754/22673
ISSN
1225-0562; 2287-7258
DOI
10.3740/MRSK.2015.25.4.183
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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