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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.1
- 수록면
- 31 - 42 (12page)
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Radial hydride precipitation behaviors of Zr-Nb alloy cladding tubes were investigated using 250 and 500 ppmhydrogen-charged Zr-Nb alloy cladding tubes, cooldown processes from 400 to 300, 200 °C and room temperaturewith five kinds of cooling rates of 0.3, 2.0, 4.0, 7.0 15.0 °C/min under a tensile hoop stress of 150 MPa,which can simulate various cooldown processes during an interim dry storage of PWR nuclear fuel. The slowercooling rate and the lower terminal cooldown temperature generated the more hydrides precipitated duringthe cooldown as well as the larger fraction and the longer length of radial hydrides. These phenomena canbe explained by the difference in the terminal solid solubility of hydrogen for dissolution and precipitationoccurring during the heatup and cooldown processes and the cooling rate-dependent hydride nucleation andgrowth rates. In addition, a drastic decrease in ultimate tensile strength and plastic strain of the tensile testedspecimens experiencing the cool-down processes appear to be correlated with the amount of the radial hydridesprecipitated during the cooldown.
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