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손광석 ( Kwang Suk Son ),박태은 ( Tae Eun Park ),박병호 ( Byung Ho Park ),김동규 ( Dong Gyu Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.4
Cu as a tramp element has been reported to encourage transverse cracking upon straightening operation during continuous casting or mini-mill processing. Therefore, the hot workability of steels containing Cu should be investigated. The purpose of the present study was to examine the effect of Cu contents on the hot ductility of low carbon steels by using hot compression test. Hot compression test was carried out using a Gleeble. The specimens were heated to 1300℃ for solution treatment and then held for 300s before cooling at a rate of 1℃/s to test temperatures in the range of 650~1150℃ (50℃ intervals) with strain rate of 5×10(-3)/s. In Cu containing steels, the hot ductility was decreased with increasing Cu content at high temperature region which is to be attributed to copper enriched phase formed at scale/steel interface, and low hot ductility with increasing Cu content at low temperature region is attributable to the strengthening of matrix by the formation of ε-Cu. The width of ductility trough region was decreased with increasing Cu content.
논문 : Al-Si-Mg-Cu 합금계의 열간 균열 특성 평가방법에 관한 연구
손광석 ( Kwang Suk Son ),박태은 ( Tae Eun Park ),김진수 ( Jin Su Kim ),강성민 ( Sung Min Kim ),김동규 ( Dong Gyu Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.5
The hot tear susceptibility of Al alloys was investigated by using a constrained-rod mold designed to quantify 8 types of tear tendency. The severity of the crack was scored by 5 grades on a scale of 0 to 4, with 0 being "no crack formed" and 4 being "complete separation by crack". The Hot Tear Susceptibility index (HTS) which consists of crack type scores and position scores, was proposed to compare the hot tear tendency of Al alloys. A356.0 cast alloy and AA6061 wrought Al alloy showed an HTS value of 27.5 and 53 respectively. The effects of Si, Cu, and Mg content on hot tear tendency were also investigated with a constrained-rod mold. The variation of HTS values with alloying elements represents similar behavior in the variation of the solidification range in a pseudo binary phase diagram.
손광석(Son, Kwang-suk),이태헌(Lee, Tai-hun) 한국고지도연구학회 2020 한국고지도연구 Vol.12 No.2
18세기 전반에 제작된 것으로 추정되는 『서북계도』는 오랜 기간 전해져 오는 동안 이전에 행해졌던 수리와 충해 등으로 인해 많은 훼손이 발생하였다. 소재의 오염 및 훼손뿐만 아니라 지도의 내용 및 형태의 훼손이 광범위 하게 나타나고 있다. 본 연구는 『서북계도』의 현상복원모사과정에서 물리적 복원을 위해 실시한 다양한 회화적 시도와 결과물을 제시하는 것을 목적으로 한다. 구체적으로는 바탕재 및 안료의 분석·재료 간의 상호작용에 관한 고찰 결과와, 더불어 회화 기법을 통해 표현된 고지도의 복원결과를 제시함으로써 유사한 형태의 유실과 오염이 전반적으로 나타나고 있는 고지도 현상복원모사에 활용될 수 있는 유의미한 참고자료를 제시하고자 하는 것이다. 본 연구의 가장 큰 성과는 원본과 최대한 유사한 성분의 바탕재를 구하기 위해 사용할 죽지를 물성분석하고, 현미경 사진 등을 통해 원화와 가장 유사한 바탕재를 찾아 검증하였다는 점에 있다. 이와 더불어 적정량의 교반수량을 찾기 위한 실험과정과 데이터의 축적결과는 향후 유사한 소재를 사용하는 복원모사의 기초데이터로 활용될 수 있다. The 『Seobukgyedo』, which was produced in the first half of the 18th century, suffered a lot of damage due to repairs and damage that were previously performed during the long period. Contamination and damage of the material, as well as damage to the content and form of the map, are widely seen. The purpose of this study is to present various pictorial attempts and results for physical restoration in the phenomena copy process of 『Seobukgyedo』. Specifically, the analysis of the base material and the coloring material, and observation results on the interaction between each material are presented. In addition, by presenting the approach process and restoration results for the painting technique of the old map, we present a meaningful reference that can be used for the phenomena copy of the old map, where similar types of loss and contamination are seen in general. An important achievement of this study is that various types of bamboo paper were analyzed for physical components to find base material with similar components to the original. In addition, the experimental process and data accumulation results to find the appropriate amount of stirring water can be used as basic data for restoration simulation using similar materials in the future.
Cu와 Si 첨가에 의한 Al-Sn 합금의 미세조직 제어
손광석 ( Kwang Suk Son ),박태은 ( Tae Eun Park ),김진수 ( Jin Soo Kim ),강성민 ( Sung Min Kang ),김태환 ( Tae Hwan Kim ),김동규 ( Dong Gyu Kim ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3
The effect of various alloying elements and melt treatment on the microstructural control of Al-Sn metallic bearing alloy was investigated. The thickness of tin film crystallized around primary aluminum decreased with the addition of 5% Cu in Al-Sn alloy, with tin particles being reduced in size by intervening the Ostwald ripening. With the addition of Si in Al-10%Sn alloy, the tin particles were crystallized with eutectic silicon, resulting in uniform distribution of tin particles. With the addition of Cu and Si in Al-Sn alloy, both the tensile strength and yield strength increased, with the increasing rate of yield strength being less than that of tensile strength. Although the Al-10%Sn-7%Si alloy has similar tensile strength compared with Al-10%Sn-5%Cu, the former showed superior abrasion resistance, resulting from preventing the tin particles from movement to the abrasion surface.
주철 알루미늄 합금의 Hot Dip Aluminizing시 흑연 및 금속간화합물 층의 형성 거동
한광식 ( Kwang Sic Han ),강용주 ( Yong Joo Kang ),강문석 ( Mun Seok Kang ),강성민 ( Sung Min Kang ),김진수 ( Jin Su Kim ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
Hot dip aluminizing (HDA) is widely used in industry for improving corrosion resistance of material. The formation of intermetallic compound layers during the contact between dissimilar materials at high temperature is common phenomenon. Generally, intermetallic compound layers of Fe2Al5 and FeAl3 are formed at the Al alloy and Fe substrate interface. In case of cast iron, high contact angle of graphite existed in the matrix inhibits the formation of intermetallic compound layer, which carry with it the disadvantage of a reduced reaction area and mechanical properties. In present work, the process for the removal of graphite existed on the surface of specimen has been investigated. And also HDA was proceeded at 800oC for 3 minutes in aluminum alloy melt. The efficiency of graphite removal was increased with the reduction of particle size in sanding process. Graphite appears to be present both in the region of melting followed by re-solidification and in the intermetallic compound layer, which could be attributed to the fact that the surface of cast iron is melted down by the formation of low melting point phase with the diffusion of Al and Si to the cast iron. Intermetallic compound layer consisted of Fe(Al,Si)3 and Fe2Al5Si, the layer formed at cast iron side contained lower amount of Si.
용융 접합한 주철 - Al 합금의 금속간화합물 층 형성 거동에 미치는 열처리의 영향
강성민 ( Sung Min Kang ),한광식 ( Kwang Sik Han ),강용주 ( Yong Joo Kang ),김광원 ( Kwang Won Kim ),임예라 ( Ye Ra Im ),문지선 ( Ji Sun Moon ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.1
Fusion bonding of cast iron and Al alloy is an effective way to improve the properties such as low inertia, high efficiency and corrosion resistance in machinery parts. In case of fusion bonding, intermetallic compound layers are formed at the interface between cast iron and Al alloy interface. It is important to control the intermetallic compound layers for improving bonding strength. The formation behavior of intermetallic compound layer by heat treatment has been investigated. Heat treatment was performed at temperature from 600oC to 800oC with 100oC interval for an hour to investigate the phase transformation during heat treatment. Heat treated specimens were analyzed by using FE-SEM, EPMA and EDS. The EPMA/WDS results revealed that various phases were formed at the interface, which exhibited 4 distinct intermetallic compound layers such as τ6-Al4.5FeSi, τ2-Al3FeSi, τ11-Al5Fe2Si and η-Al5Fe2. Also, fine precipitation of τ1-Al2Fe3Si3 phase was formed between τ11 and η layer. The phase fraction in intermetallic compound layer was changed by heat treatment temperature. At 600oC, intermetallic compound layer of τ6 phase was mainly formed with increasing heat treatment time. With increasing heat treatment temperature to 800oC, however, τ2 phase was mainly distributed in intermetallic compound layer. τ1 phase was remarkably decreased with increasing heat treatment time and temperature.
전승병 ( Seung Byung Jeon ),김진수 ( Jin Su Kim ),김광원 ( Kwang Won Kim ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.1
This work assesses the hot ductility behavior of high manganese steel under hot working conditions. Reduction of area (RA) behavior of 16 Mn-0.5 C steel was investigated to consider it for production in a slab and subsequent hot rolling process. All specimens were machined from the as-cast slab. A hot ductility test was accomplished by a cast simulator through a temperature range of 650 ℃-1200 ℃ with 50 ℃ intervals. The obtained RA values ranged between 30% and 60%, with a maximum at 850℃, and this is far from the general RA behavior of low carbon steel. This result could be attributed to the fact that the specimen is fully austenitic through all test temperatures, and that there is no ferrite at the low temperature end and reduced dynamic recrystallization at the high temperature end. Microstructural evaluation of the fractured specimen revealed that the deformation was concentrated at the grain boundary, and there was little matrix deformation. These results suggest that the grain boundary sliding is the basic cause of the fracture and low values of hot ductility in high manganese steel.
탄소강의 열간 연성에 미치는 저주기 피로 시기와 냉각속도의 영향
박태은 ( Tae Eun Park ),이운해 ( Un Hae Lee ),손광석 ( Kwang Suk Son ),이성근 ( Sung Keun Lee ),김인수 ( In Soo Kim ),임창희 ( Chang Hee Yim ),김동규 ( Dong Gyu Kim ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3
The effects of cooling rate and onset time of fatigue test on hot ductility of plain carbon steels containing 0.06~0.8 wt.% carbon were investigated at various temperatures. The tensile tested specimen after fatigue strain during cooling showed higher hot ductility than the specimen fatigued and tensile-strained after cooling. With a decreasing cooling rate from solutionizing temperature to test temperature, hot ductility was increased in all temperature ranges, typically in the trough region, and the minimum point of ductility moved to a lower temperature. Also, the depth and width of the trough decreased with lowering the cooling rate.
연주 주편의 열간 연성에 미치는 변형속도 및 재용해의 영향
변재환,손광석,서상철,김진수,이주동,임창희,김인수,이성근,김동규 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3
The effect of strain rate and remelting on hot ductility of low carbon steel were investigated. The specimen was prepared from as cast continuous casting slab, and also the slab was remelted to assess the effect of remelting by which cast structure would be modified. High temperature tensile test was adopted to get the hot ductility data. In case of 0.18 wt.% carbon steel, hot ductility was markedly improved with increasing strain rate in both specimen obtained from as cast slab and remelted slab. Comparing the results obtained from as cast specimen and remelted specimen, it showed similar value of hot ductility in low temperature range, and in high temperature region, showed higher R/A(reduction of area) value in the specimen obtained from remelted slab. The decreased RA value of as cast specimen in high temperature region could be explained by the increase in initial grain size due to slow cooling of large slab during continuous casting. It means that we should presume lower value of hot ductility than the value obtained from remelted specimen in case of lab data application to actual continuous casting process. (Received November 22, 2004)