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임차용,강석봉,Lim, Cha-Yong,Kang, Suk-Bong 한국자원리싸이클링학회 2000 資源 리싸이클링 Vol.9 No.2
알루미늄 폐캔은 중요한 재활용 자원으로서 알루미늄 캔용 원소재 판재는 물론 알루미늄의 국내소요량을 전량 수입에 의존하고 있는 우리나라로서는 활용 가능한 알루미늄폐캔의 재활용율을 높여야 하는 것은 외화절약과 환경보호 측면에서 대단히 중요하다. 사용한 알루미늄 캔을 다시 캔으로 재활용 하는 단계는 폐캔의 수집, 파쇄, 선별, 도료제거, 용해 및 2차지금을 제조하는 단계와 이 2차지금을 이용하여 열처리, 열간 및 냉간압연, 중간소둔처리 등을 거쳐 다시 캔을 성형하는 2단계로 나눌수 있다. 본 자료에서는 이러한 알루미늄 캔의 재활용 기술에 대한 우리나라와 선진국들의 현황과 전망을 소개하였다. Used aluminum beverage can(UBC) is an important secondary resource. Domestic recycling rate of UBC should be increased from the standpoint of resource savings and environmental protection. Aluminum can to can recycling is divided into two steps. The first step was composed of the processes such as collection of used beverage cans, shredding, magnetic separation, de-lacquring, melting and casting. The second is remelting and casting, heat treatment, hot and cold rolling, annealing, and can making. With brief discussion about this recycling technology, this article covers aluminum can consumption, the present state of aluminum can recycling in Korea, Japan, USA, and Europe.
EBSD측정에 의한 반복겹침접합압연된 무산소동의 두께방향으로의 미세조직 변화 분석
이성희,임차용,Lee, Seong-Hee,Lim, Cha-Yong 한국재료학회 2014 한국재료학회지 Vol.24 No.11
Microstructural evolution in the thickness direction of an oxygen free copper processed by accumulative rollbonding (ARB) is investigated by electron back scatter diffraction (EBSD) measurement. For the ARB, two copper alloy sheets 1 mm thick, 30 mm wide and 300 mm long are first degreased and wire-brushed for sound bonding. The sheets are then stacked and roll-bonded by about 50% reduction rolling without lubrication at an ambient temperature. The bonded sheet is then cut to the two pieces of the same dimensions and the same procedure was repeated on the sheets up to eight cycles. The specimen after 1 cycle showed inhomogeneous microstructure in the thickness direction so that the grains near the surface were finer than those near the center. This inhomogeneity decreased with an increasing number of ARB cycles, and the grain sizes of the specimens after 3 cycles were almost identical. In addition, the aspect ratio of the grains decreased with an increasing number of ARB cycles due to the subdivision of the grains by shear deformation. The fraction of grains with high angle grain boundaries also increased with continuing process of the ARB so that it was higher than that of the low angle grain boundaries in specimens after 3 cycles. A discontinuous dynamic recrystallization occurred partially in specimens after 5 cycles.
접합압연공정에 의해 제조된 AA1050/Mg(AZ91)/AA1050 복합판재의 미세조직 및 기계적 특성
이성희,유효상,임차용,Lee, Seong-Hee,You, Hyo-Sang,Lim, Cha-Yong 한국재료학회 2016 한국재료학회지 Vol.26 No.3
A roll-bonding process was applied to fabricate an AA1050/AZ91/AA1050 laminate complex sheet. Two AA1050 and one AZ91 magnesium sheets of 2 mm thickness, 30 mm width and 200 mm length were stacked up after surface treatment that included degreasing and wire brushing; material was then reduced to a thickness of 3 mm by one-pass cold rolling. The laminate sheet bonded by the rolling was further reduced to 2 mm in thickness by conventional rolling. The rolling was performed at 623K without lubricant using a 2-high mill with a roll diameter of 210 mm. The rolling speed was 15.9 m/min. The AA1050/AZ91/AA1050 laminate complex sheet fabricated by roll bonding was then annealed at 373~573K for 0.5h. The microstructure of the complex sheets was revealed by electron back scatter diffraction (EBSD) measurement; the mechanical properties were investigated by tensile testing and hardness testing. The strength of the complex sheet was found to increase by 11 % and the tensile elongation decreased by 7%, compared to those values of the starting material. In addition, the hardness of the AZ91 Mg region was slightly higher than those of the AA1050 regions. Both AA1050 and AZ91 showed a typical deformation structure in which the grains were elongated in the rolling direction; however, the mis-orientation distribution of grain boundaries varied greatly between the two materials.
이성희,한승전,임차용,Lee, Seong-Hee,Han, Seung-Zeon,Lim, Cha-Yong 한국재료학회 2006 한국재료학회지 Vol.16 No.9
A deoxidized low-phosphorous (DLP) copper was processed by accumulative roll-bonding (ARB) for ultra grain refinement and high strengthening. Two copper sheets 1 mm thick, 30 mm wide and 300 mm long are first degreased and wire-brushed for sound bonding. The sheets are then stacked to each other, and roll-bonded by about 50% reduction rolling without lubrication at ambient temperature. The bonded sheet is then cut to the two pieces of same dimensions and the same procedure was repeated to the sheets up to eight cycles (${\varepsilon}{\sim}6.3$). TEM observation revealed that ultrafine grains were developed after the 4th cycle, and their size decreased at higher cycles. Tensile strength of the copper increased with the equivalent strain, and it reached 547 MPa which was 3 times higher than that of the initial material. It is concluded that the ARB process is an effective method for high strengthening of the DLP copper.
저변형률속도에서 ARB가공된 무산소동의 미세조직 및 기계적 성질
이성희,한승전,임차용,Lee, Seong-Hee,Han, Seung-Zeon,Lim, Cha-Yong 한국재료학회 2007 한국재료학회지 Vol.17 No.10
The microstructure and mechanical properties of an oxygen free copper processed by accumulative roll bonding(ARB) at low strain rate were studied. The copper sheets were highly strained up to an equivalent strain of ${\sim}6.4$ by ARB process at ambient temperature. The strain rate of the copper during the ARB was $2.6sec^{-1}$. The microstructure and mechanical properties of the ARB-processed copper were compared to those of the specimens processed by ARB at relatively high strain rate ($37sec^{-1}$). The microstructure and mechanical properties of the copper with ARB process was very similar to each other despite of some differences in recovery.
ARB가공된 인탈산동의 어닐링에 따른 미세조직 및 기계적 특성 변화
이성희,김춘수,김상식,한승전,임차용,Lee, Seong-Hee,Kim, Chun-Su,Kim, Sang-Shik,Han, Seung-Zeon,Lim, Cha-Yong 한국재료학회 2007 한국재료학회지 Vol.17 No.7
A deoxidized low-phosphorous copper processed by eight cycles of accumulative roll-bonding (ARB) was annealed at various temperatures ranging from 100 to $400^{\circ}C$. The annealed copper was characterized by transmission electron microscopy (TEM) and tensile & hardness test. TEM observation revealed that the ultrafine grains developed by the ARB still remained up to $350^{\circ}C$, however above $400^{\circ}C$ they were replaced by equiaxed and coarse grains due to an occurrence of the static recrystallization. The hardness of the copper decreased slightly with the annealing temperature up to $350^{\circ}C$, however they dropped largely above $400^{\circ}C$. Annealing characteristics of the copper were compared with those of an oxygen free copper processed by ARB and subsequently annealed.
이성희,한승전,김형욱,임차용,Lee, Seong-Hee,Han, Seung-Zeon,Kim, Hyoung-Wook,Lim, Cha-Yong 한국재료학회 2009 한국재료학회지 Vol.19 No.8
A Cu-Fe-P copper alloy was processed by accumulative roll-bonding (ARB) for ultra grain refinement and high strengthening. Two 1mm thick copper sheets, 30 mm wide and 300 mm long, were first degreased and wire-brushed for sound bonding. The sheets were then stacked on top of each other and roll-bonded by about 50% reduction rolling without lubrication at ambient temperature. The bonded sheet was then cut into two pieces of the same dimensions and the same procedure was repeated for the sheets up to eight cycles. Microstructural evolution of the copper alloy with the number of the ARB cycles was investigated by optical microscopy (OM), transmission electron microscopy(TEM), and electron back scatter diffraction(EBSD). The grain size decreased gradually with the number of ARB cycles, and was reduced to 290 nm after eight cycles. The boundaries above 60% of ultrafine grains formed exhibited high angle boundaries above 15 degrees. In addition, the average misorientation angle of ultrafine grains was 30 degrees.
이성희,조준,이충효,한승전,임차용,Lee Seong-Hee,Cho Jun,Lee Chung-Hyo,Han Seung-Zun,Lim Cha-Yong 한국재료학회 2005 한국재료학회지 Vol.15 No.9
An oxygen free copper severely-deformed by eight cycles (an equivalent strain of $\~6.4$) of accumulative roll-bonding (ARB) was annealed at various temperatures ranging from 100 to $300^{\circ}C$. The annealed copper was characterized by transmission electron microscopy (TEM) and tensile & hardness test. TEM observation revealed that the ultrafine grains developed by the ARB still remained up to $150^{\circ}C$, however above $200^{\circ}C$ they were replaced by equiaxed and coarse grains due to an occurrence of the static recrystallization. Tensile strength and hardness of the copper decreased slightly with the annealing temperature up to $150^{\circ}C$, however they dropped largely above $200^{\circ}C$. Annealing characteristics of the copper were compared with those of a commercially pure aluminum processed by ARB and subsequently annealed.