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RISS 인기검색어
- 검색키워드
- 저자 : 박순삼(Soon-Sam Park) (검색결과 4 건)
- 무료
- 기관 내 무료
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김선식(Seon-Sik Kim),박순삼(Soon-Sam Park),김성수(Sung-Soo Kim),정용무(Yong-Moo Cheong),김영석(Young-Suk Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
The purpose of this study is to investigate the precipitation behavior of zirconium hydrides in a Zr-2.5Nb pressure tube. The hydride precipitates were observed on the two sections (longitudinal-normal(LN) and transeverse-normal(TN) sections) from the Zr-2.5Nb pressure tube using transmission electron microscopy and electron diffraction pattern. The hydride habit plane, related to the crack growth direction of DHC (delayed hydride cracking), was {1017}<SUB>Zr</SUB> plane. The orientation relationship between the hydride and the Zr matrix on the LN section was found to be : [1210]<SUB>Zr</SUB> // [110]<SUB>H</SUB>. (0001)<SUB>Zr</SUB> // (111)<SUB>H</SUB>. The morphology and growth pattern of hydrides on the TN section is classified two cases : one is long hydride grown along the α-Zr grain, the other is thin needle type hydride across the α-Zr grain. Based on the analysis of MBD (micro beam diffraction) patterns on each hydride, the difference in the precipitation pattern of hydrides is discussed.
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수소량에 따른 Zr-2.5Nb 압력관의 DHC 속도 및 K<SUB>IH</SUB>
김영석(Kim Young Suk),박순삼(Soon Sam Park),김성수(Sung Soo Kim),정용무(Yong Moo Cheong),임경수(Kyung Soo Im) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
To obtain a better understanding of DHC phenomenon, this study focused on the effect of DHC velocity and threshold stress intensity factor, K1H, of Zr-2.5Nb tubes as a function of hydrogen concentrations. 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 an activation energy of 49 KJ/㏖ in a temperature range of 144 and 250℃ and decreased with decreasing hydrogen concentration. The threshold stress intensity factor, K1H in the axial direction of Zr-2.5Nb tube also had a dependence of hydrogen concentration: a exponential decrease of K1H to a constant with increasing hydrogen concentration. Thus, DHCV and K1H were nicely described as a function of the supersaturated hydrogen concentration over TSSD independent of temperatures. Based on these results, we propose that K1H is a critical stress intensity factor to drop a supersaturated hydrogen concentration at the crack tip region to the equilibrium solubility for dissolution at any temperatures. Hence, the lower the initial hydrogen concentration at the matrix region, the smaller a concentration gradient between the crack tip and the matrix region, lowering DHCV.
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Zr-2.5Nb 압력관에서 균열방향에 따른 K<SUB>1H</SUB>
김상재(Sang-Jai Kim),박순삼(Soon-Sam Park),임경수(Kyung-Soo Im),정용무(Yong-Moo Cheong),김영석(Young-Suk Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
The aim of this study was to obtain a better understanding of delayed hydride cracking (DHC) of Zr-2.5Nb pressure tube with crack growth direction. DHC tests were conducted at temperatures ranging form 160~280℃ on Curved Compact Tension (CCT) and Cantilever Beam (CB) specimens with 60 ppm H to determine the threshold stress intensity factor, K1H in axial and radial directions of the Zr-2.5Nb tube, respectively. Over a temperature range of 160~250℃, K1H for the Zr-2.5Nb tube 5.84 ㎫ √m in the axial direction and 8.4 ㎫ √m in the radial direction, both of which were constant independent of temperatures, However, at 280℃, K1H increased unexpectedly to a higher value. Based on the results, K1H for Zr-2.5Nb tube is discussed with the orientation, hydride habit plane and a supersaturated concentration of hydrogen.
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안창윤(Chang-Yun An),오동준(Dong-Joon Oh),조선영(Sun-Young Cho),박순삼(Soon-Sam Park),임경수(Kyung-Soo Lim),김영석(Young-Suk Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
One of the most important safety requirements the CANDU Zr-2.5Nb pressure tube shall meet during its life time is a leak-be fore-break (LBB) criterion whose safety margin is governed by delayed hydride cracking velocity and fracture toughness. Zr-2.5Nb pressure tube used currently in CANDU reactors is very susceptible to delayed hydride cracking, causing many failures and replacements of pressure tubes. The objective of this study is to characterize the delayed hydride cracking of different pressure tubs such as CANDU and TMT-l. This study has reported the DHC characteristics of Zr-2.5Nb pressure tubes obtained using the qualified DHC test procedure set-up through the IAEA round robin test on DHC with curved compact toughness specimens. DHC velocities were measured and compared at temperature ranging from 144℃, 182℃ to 250℃. After DHC testing, fracture surface were investigated with a stereoscope. DHC velocities were increased with temperature and DHCV of TMT-I pressure tube was slower than that of CANDU pressure tube. And the effects of yield stress and texture on the DHCV were discussed.
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