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          비정질 이원계 합금 Zr-Be 용가재를 이용한 지르칼로이-4의 브레이징 타당성 검토

          고진현,박춘호,김수성 대한용접접합학회 1999 대한용접·접합학회지 Vol.17 No.4

          An attempt was made in this study to investigate the brazing characteristics of Zr-Be binary amorphous alloys for the development of a new brazing filler metal for joining Zircaloy-4 nuclear fuel cladding tubes. This study was also aimed at the feasibility study of rapidly solidified amorphous alloys to substitute the conventional physical vapor-deposited(PVD) metallic beryllium. The $Zr_{1-x}Be_{x}$($0.3\leq$x$\leq0.5$) binary amorphous alloys were produced in the ribbon form by the melt-spinning method. It was confirmed by x-ray diffraction that the ribbons were amorphous. The amorphous. the amorphous alloys were used to join bearing pads on Zircaloy-4 nuclear fuel cladding tubes. Using Zr-Be amorphous alloys as filler metals, it was found that the reduction in the tube wall thickness caused by erosion was prevented. Especially, in the case of using $Zr_{0.65}Be_{0.35}$ and $Zr_{0.7}Be_{0.3}$ amorphousalloys, the smooth and spherical primary $\alpha$-Zr particles appeared in the brazed layer, which was the most desirable microstructure from the corrosion-resistance standpoint.

        • KCI등재

          저항 업셋 용접방식에 따른 Zircaloy-4 핵연료 피복재 용접부의 미세조직 특성

          고진현,김상호,박춘호,김수성 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.3

          A study on microstructures of welds for Zircaloy-4 sheath end closure by the resistance upset welding methods was carried out. Two upset welding process variations such as magnetic farce and multi-impulse resistance welding were used. Grain size and microhardness across welds were analysed in terms of welding parameters. Magnetic farce resistance weld with one cycle of unbalanced mode has smaller upset length and $\alpha-grain$ size in heat affected zone than those of multi-impulse resistance weld because of lower heat input and shorter welding time. Heat affected zone formed by two upset resistance welding variations revealed fine Widmanstatten structure or martensitic ${\alpha}'$ structure due to the high heating rate and foster cooling rate. Magnetic force resistance welds showed recrystallized grains before grain growth, whereas multi-impulse resistance welds showed full grain growth.

        • Zircaloy-4 브레이징 용가재인 Zr-Be 이원계 비정질 합금의 열적 안정성과 브레이징 접합부의 미세조직에 관한 연구

          고진현 한국기술교육대학교 1994 論文集 Vol.1 No.1

          This work presents an investigation of brazed joints with newly developed two amorphous filler metals such as Zr50Be50 and Zr65Be35, which are candidate materials of the brazing filler metals for the nuclear fuel cladding materials. The crystallinity and thermal stability of filler metals as well as microstructures of brazed joints were examined by X-ray diffraction, differential scanning calorimeter, optical and scanning electron microscopies, respectively. The phases in the brazed zones were analysed by X-ray diffractometer and Auger electron spectroscopy. The crystallization temperatures of amorphous filler metals by the differential scanning calorimeter were 470℃ for Zr50Be50 and 460℃ for Zr65Be35. Although the brazed zones made by the physically vapor deposited filler metals showed erosion in the filler metal/parent metal interface due to the diffusion brazing, those made by amorphous filler metals did not show any evidence of erosion in the brazed zone. The brazed zone microstructure with amorphous filler metals showed more globular morphology of zirconium compounds than that by the physical vapor deposition.

        • KCI등재

          라멜라균열의 생성온도와 비금속개재물의 영향

          고진현 대한용접접합학회 1992 대한용접·접합학회지 Vol.10 No.2

          This study was aimed at resolving uncertainties about lamellar tearing initiation temperatures and studying the effect of nonmetallic inclusions on the tear initiation. In order to measure the lamellar tearing initiation temperature, the slice bend test was conducted in the temperature range of 20.deg.C to 425.deg.C on A572 Grade 50 and A588 Grade A steels. In addition, the weld restrain test was carried out to measure directly the tear initiation temperature with A572 steel. In slice bend tests, A572 steel showed the most susceptible region to lamellar tearing to be in the range of 100 to 300.deg.C, where the steel showed the minimum ductility. The observed tear initiation by the weld restraint test was to be in the range of 200to 300.deg.C. The tears became narrower and less rounded at the susceptible temperatures. It was confirmed in this study that lamellar teraring initiated during cooling from welding in the range of 200 to 300.deg.C and they were initiated by strain aging embrittlement.

        • KCI등재

          국산 플럭스 코어드 와이어 용접에서 입열량이 용접부의 미세조직과 인성에 미치는 영향

          고진현,국정한 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.4

          In the present study, the microstructure and Charpy V notch toughness of multipass $CO_2$ FCA weldment in three different heat inputs(1-3KJ/mm)were investigated. The weldments using two different domestic FCAW wires(AWS E71T-1 and E71T-5 equivalent) in C-Mn steel were chemically analysed. The following conclusions can be inferred. 1. T-1 wire Showed a stable arc transfer, less spatter and harsh, a better bead spreading and easy slag removal, whereas T-5 wire suffered from the arc stability, which tended to increase spatter and produce a more convex bead. 2.The microsturctures of the top beads of the weldments in three different heat inputs consisted of coarse-grained boundary ferrite and Widmanstatten ferrite side plate with increasing heat inputs. The modest fraction of acicular ferrite in the two wire weldments was observed in the 2KJ/mm heat input. 3.The fine-grained reheated zones of both welds consisted of a duplex microstructure of polygonal ferrite and second phases. 4. The basic flux weldment of T-5wires showed a higher Charpy impact property than that of T-1 wires because of a higher fraction of acicular ferrite in the weld microstructure.

        • KCI등재

          베릴륨 용가재를 사용한 핵연료피복재 지르칼로이-4 브레이징에 대한 연구

          고진현,김형수 대한용접접합학회 1993 대한용접·접합학회지 Vol.11 No.4

          An attempt was made to investigate the effect of brazing time on microstructure, microhardness, and corrosion of Zircaloy -4as well as the beryllium diffusion into its sheet. The sheets were coated with beryllium and brazed at $1020^{\circ}C$ for 20-40 minutes in $2{\times}10^{-5}$ torr vacuum atmosphere. 1. Microstructurally the brazed zone was largely divided into three regions: a region of continuous or partially formed of eutectic liquid films along grain boundaries; a region of precipitation in both grains and grain boundaries; a region of elongated wide structure of .alpha.-laths, which was not affected by beryllium. 2. Due to the precipitates, the beryllium-migrated region was hardened and the width of the hardened region increased with increasing brazing time. 3. Beryllium brazed Zircaloy -4 sheets showed a higher corrosion rate than those of as-received and heat-treated at a brazing temperature. 4. Diffusion coefficient of beryllium into Zircaloy -4 at $1020^{\circ}C$ for 30 minutes was $7.67{\times}10^{-7}cm^2/sec.$ It seemed that Be penetrated Zircaloy -4 by forming eutectic liquid films along grain boundaries in the proximity of Be/Zr interface and it, thereafter, diffused into Zircaloy mainly by interstitial solid solution.

        • KCI등재

          소셜 빅데이터를 활용한 일본관광에 대한 인식 변화 분석: 일본제품 불매운동을 중심으로

          고진현 관광경영학회 2020 관광경영연구 Vol.99 No.-

          This study collected and analyzed words related to the keyword ‘Travel to Japan’ and recognized changes before and after the incident, focusing on the boycott of Japanese products in Korea caused by the trade dispute between Korea and Japan in August 2019. In the second half of 2019, when the boycott was in full swing, related words such as ‘cancellation’ and ‘boycott’ were found to be high in frequency and it is believed that they canceled or changed their visits to Japan due to the outbreak of the boycott. What is noteworthy is that even during the boycott, words related to travel to Japan during the normal period continued to appear, and it was inferred that visits to Japan were maintained in terms of individual selective purchases. In the first half of 2020, the words related to COVID-19 such as ‘Corona’ and ‘self-quarantine’ were high, instead of words related to the boycott. Furthermore, words such as 'memory', 'remembrance', 'last year' appeared mostly higher due to immigration restrictions between Korea and Japan to prevent the spread of COVID-19. These results can be interpreted that when negative information is encountered through natural disasters or accidents but still Korean tourists consider Japan to be an attractive destination.

        • KCI등재

          압력용기강재 SA508 class 3 용착금속의 조사거동

          고진현,박형근,김수성,황용화,서윤석,Koh, Jin-Hyun,Park, Hyoung-Keun,Kim, Soo-Sung,Hwang, Yong-Hwa,Seo, Yun-Seok 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5

          Irradiation behavior of the reactor pressure vessel SA508 class 3 steel weld metals was examined by Charpy V Notch impact specimens. The specimens were exposed to a fluence of $2.8{\times}1019$ neutrons(n)/$cm^2$(E>1 MeV) at $288^{\circ}C$. The irradiation damage of weld metal was evaluated by comparison between unirradiated and irradiated specimens in terms of absorbed energy and lateral expansion. The specimens for neutron irradiation were welded by submerged arc welding process at a heat input of 3.2 kJ/mm which showed good toughness in terms of weld microstructure, absorbed energy and lateral expansion. The post-irradiation Charpy V notch 41J and 68J transition temperature elevation were $65^{\circ}C$ and $70^{\circ}C$, respectively. This elevation was accompanied by a 20% reduction in Charpy V notch upper shelf energy level. The lateral expansion at 0.9mm irradiated Charpy specimens showed temperature elevation of $65^{\circ}C$ and was greatly decreased due to radiation damage.

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