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Analysis of Dimensional Change in Zr-2.5%Nb CANDU Pressure Tube Material aged at 300-400°C using Neutron Diffraction
300-400oC에서 시효 처리된 Zr-2.5%Nb CANDU 압력관 재료에서 중성자 회절을 이용한 dimensional change 분석
Jong Yeob Jung, Hyung Sub Kim, Sung Soo Kim, Young Suk Kim
정종엽, 김형섭, 김성수, 김영석
Korean J. Met. Mater. 2022;60(5):341-349.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.341

Abstract
The primary boundary of the CANDU reactor consists of Zr-2.5%Nb alloy pressure tubes and SA106 alloy feeder pipes. The pressure tubes are exposed to fast neutron (E>1Mev) irradiation during reactor operation, and experience dimensional changes. The actual dimensional change in the pressure tube during in-service operation is greater than the..... More

                        
The Cause of Intergranular (IG) Fracture by Thermal Embrittlement in SA508 of Reactor Pressure Vessel (RPV) Steel
압력 용기 재료 SA508에서 열적 처리에 따른 입계 파괴의 원인
Sung Soo Kim, Jung Jong Yeob, Young Suk Kim
김성수, 정종엽, 김영석
Korean J. Met. Mater. 2021;59(9):589-601.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.589

Abstract
Intergranular(IG) fracture due to thermal treatment has been reported in a reactor pressure vessel(RPV) steel of Russian light water reactor in last decade. This is attributed to grain boundary segregation of phosphorus (P) or precipitation of carbide, etc.. This is a finding a difference in microstructure before and after IG..... More

                           Cited By 2
Susceptibility to Severe PWSCC (primary water stress corrosion cracking) of LTMA (low temperature mill anneal) Alloy 600
저온 풀림 처리 Alloy 600이 1차수 응력 부식 균열에 가장 예민한 이유
Sung Soo Kim, Jung Jong Yeob, Young Suk Kim
김성수, 정종엽, 김영석
Korean J. Met. Mater. 2020;58(12):815-821.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.815

Abstract
It has been proposed that a primary water stress corrosion cracking (PWSCC) in pressurized water reactor (PWR) is governed by a lattice contraction due to a short range ordering reaction in Alloy 600. This leads researcher to think that the kinetics of lattice contraction may control a susceptibility of PWSCC..... More

                           Cited By 3
Short Range Ordering (SRO) Reaction in Ni-base Alloy X-750
Ni-base X-750 합금에서의 단 범위 규칙화 반응
SungSoo Kim, Jung Jong Yeob, Young Suk Kim
김성수, 정종엽, 김영석
Korean J. Met. Mater. 2020;58(9):590-598.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.590

Abstract
The short range ordering (SRO) reaction of the X-750 Ni-base alloy used as a garter spring material for CANDU reactors was systematically investigated through differential scanning calorimeter (DSC) analysis. Water quenching (WQ) after solution annealing (SA) and 20% cold rolled (CR) X-750 were prepared and these samples were subjected to..... More

                           Cited By 2
Effects of Short Range Ordering on Aging Phenomenon in Zr-2.5%Nb Pressure Tube Material
단 범위 규칙 반응이 Zr-2.5%Nb 압력관 재료의 시효(aging) 현상에 미치는 영향
Sung Soo Kim, Young Suk Kim, Jong Yeob Jung
김성수, 김영석, 정종엽
Korean J. Met. Mater. 2018;56(7):479-489.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.479

Abstract
This study was conducted to investigate the effect of aging treatment from 300 °C to 420 °C on the mechanical properties of the pressure tube material at 310 °C, which is outlet temperature pressure tube in CANDU reactor. The short range ordering (SRO) phenomenon during aging process is confirmed by..... More

                           Cited By 2
The Effects of Cooling Rate on Deformation Mechanism at Room Temperature in Mild Steel
연강에서 상온 변형 기구에 미치는 냉각 속도의 영향
SungSoo Kim, Yoon Sang Lee, Young Suk Kim
김성수, 이윤상, 김영석
Korean J. Met. Mater. 2016;54(12):875-884.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.875

Abstract
The deformation mechanism at room temperature in water quenched (WQ) and furnace cooled (FC) mild steels was investigated in a plane tilted 45° from the tensile direction, using electron back scattered diffraction, XRD, and TEM. The occurrence of (211) twinning was confirmed by pole figures and the slip systems were..... More

      
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