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- 저자 : 임경수(Kyung Sao Im) (검색결과 1 건)
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Better Understanding of Delayed Hydride Cracking in Zr-2.5Nb TUbes
김영석(Kim Young Suk),Soon Sam Park,김성수(Sung Soo Kim),정용무(Yang Moo Cheong),안상복,임경수(Kyung Sao Im) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
This study focuses on the elucidation of delayed hydride cracking (DHC) of zirconium alloys, which has not been clearly understood up to date. DHC tests were conducted on the compact tension (CT) specimens of a CANDU Zr-2.5Nb pressure tube with hydrogen concentration varying from 12 to 100 ppm. DHC tests were conducted on the compact tension specimens of Zr-2.5Nb with hydrogen concentration varying from 12 to 100 ppm. Hydrogen was charged electrolytically into the CT specimens followed by a homogenization treatment. The DHCV for Zr-2.5Nb pressure tube had a temperature dependence with an activation energy of 49 KJ/mol in a temperature range from 144 to 250℃ and decreased with decreasing hydrogen concentration. The threshold stress intensity factor, KIH in the axial direction of Zr-2.5Nb tube also had a dependence of hydrogen concentration: a drastic decrease of KIH to a constant with increasing hydrogen concentration. Thus, DHCV and KIH were nicely described as a function of the supersaturated hydrogen concentration over TSSD independent of temperatures. Based on these results, we propose that KIH is a critical stress intensity factor to nucleate hydrides at the crack tip region, reducing a supersaturated hydrogen concentration at the crack tip region to the equilibrium terminal solid solubility for dissolution (TSSD) at any temperatures. Therefore, we conclude that the gradient of the equilibrium hydrogen concentration or TSSD at the crack tip region and the supersaturated one at the matrix region is a governing factor to initiate DHC.
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