Zr-2.5Nb 압력관에서 Striation Spacing과 DHCV의 관계

최승준; 안상복; 박순삼; 김영석

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이 논문의 연구 히스토리 (2)

2004

Zr-2.5Nb 압력관에서 Striation Spacing과 DHCV의 관계

최승준 , 안상복 , 박순삼 외 1명 대한기계학회 논문집 A권 2004.08 학술저널

2003

Zr-2.5Nb 압력관에서의 Striation Spacing과 DHCV의 관계

최승준 , 안상복 , 김성수 외 2명 대한기계학회 춘추학술대회 2003.08 학술대회자료

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The objective of this study is to elucidate what governs delayed hydride cracking (DHC) in Zr-2.5Nb tubes by correlating the striation spacings with DHCV(DHC Velocity). To this end, DHC tests were conducted on the compact tension specimens taken from the Zr-2.5Nb tubes at different temperatures ranging from 100 to 300 °c with a 3 to 6 data set at each test conditions. The compact tension specimens were electrolytically charged with 27 to 87 ppm H before DHC tests. After DHC tests, the striation spacings and DHCV were determined with the increasing the test temperature and yield strength. The striation spacing and DHCV increased as a function of yield strength2 and the temperature. Since the plastic zone size ahead of the crack tip can be represented by -(KIH/oy)2, we conclude that the striation spacing is governed by the plastic zone size which in turn determines a gradient of hydrogen concentration at the crack tip. The relationship between the plastic zone size and the striation spacing was validated through a complimentary experiment using double cantilever beam specimens. Two main factors to govern DHCV of Zr-2.5Nb tubes are concluded to be hydrogen diffusion and a hydrogen concentration gradient at the crack tip that are controlled by temperature and yield strength, respectively. The activation energy of DHCV in the Zr-2.5Nb tubes is discussed on the basis of temperature dependency of hydrogen diffusion and the striation spacing.