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김휘준,배정찬,김도향,Kim, Hwi-Jun,Bae, Jung-Chan,Kim, Do-Hyang 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
본고에서는 고유한 원자구조에 기인한 우수한 특성으로 인해 구조재료 및 기능재료로서 그 활용이 기대되고 있는 벌크 아몰퍼스 소재에 있어 온간압출, 온간압연, 방전 플라즈마 소결(Spark Plasma Sintering)등 과냉각액체온도구간에서의 점성유동을 이용한 고화성형 공정의 최근 기술동향에 대해 간략히 소개했다.
Spark Plasma Sintering에 의한 가스분무 Mg-Zn-Y 합금분말의 성형특성
이진규,김택수,배정찬,Lee, Jin-Kyu,Kim, Taek-Soo,Bae, Jung-Chan 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.2
Using Spark Plasma Sintering process (SPS), consolidation behavior of gas atomized $Mg_{97}Zn_1Y_2$ alloys were investigated via examining the microstructure and evaluating the mechanical properties. In the atomized ahoy powders, fine $Mg_{12}YZn$ particles were homogeneously distributed in the ${\alpha}-Mg$ matrix. The phase distribution was maintained even after SPS at 723 K, although $Mg_{24}Y_5$ particles were newly precipitated by consolidating at 748 K. The density of the consolidated bulk Mg-Zn-Y alloy was $1.86g/cm^3$. The ultimate tensile strength (UTS) and elongation were varied with the consolidation temperature.
채홍준,이진규,배정찬,김택수,Chae, Hong-Jun,Lee, Jin-Kyu,Bae, Jung-Chan,Kim, Taek-Soo 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
Mg-4.3Zn-0.7Y (at%) alloy powders were prepared using an industrial scale gas atomizer, followed by warm extrusion. The powders were almost spherical in shape. The microstructure of atomized powders and those extruded bars was examined using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscope (EDS) and X-ray Diffractometer (XRD). The grain size of the powders was coarsen as the initial powder size increased. After the extrusion, the grain size became fine due to the severe plastic deformation during the extrusion with the ratio of 10:1. Both the ultimate strength and elongation were enhanced with the decrease of initial particle size.
Cu계 및 Ni계 비정질 합금 분말을 이용한 비정질기지 복합재의 제조 및 특성
김택수,이진규,김휘준,배정찬,Kim Taek-Soo,Lee Jin-Kyu,Kim Hwi-Jun,Bae Jung-Chan 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.6
This work is to present a new synthesis of metallic glass (MG)/metallic glass (MG) composites using gas atomization and spark plasma sintering (SPS) processes. The MG powders of $Cu_{54}Ni_6Zr_{22}Ti_{18}$ (CuA) and $Ni_{59}Zr_{15}Ti_{13}Nb_7Si_3Sn_2Al_1$(NiA) as atomized consist of fully amorphous phases and present a different thermal behavior; $T_g$ (glass transition temperature) and $T_x$ (crystallization temperature) are 716K and 765K for the Cu base powder, but 836K and 890K for the Ni base ones, respectively. SPS process was used to consolidate the mixture of each amorphous powder, being $CuA/10\%NiA\;and\;NiA/10\%CuA$ in weight. The resultant phases were Cu crystalline dispersed NiA matrix composites as well as NiA phase dispersed CuA matrix composites, depending on the SPS temperatures. Effect of the second phases embedded in the MG matrix was discussed on the micro-structure and mechanical properties.
박수홍(Park Soo-Hong),김휘준(Kim Hwi-Jun),정경렬(Chung Kyung-Ryul),배정찬(Bae Jung-Chan) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Pantograph, which collects current from cartenary system, is one of important parts of high-speed train. Kinematic analysis is basic component of pantograph design. But kinematic analysis is very complex and time-consuming. Therefore numerical calculation of pantograph kinematics is necessary. In this study, pantograph kinematic analysis software was developed and relationship between kinematic parameters and pantograph performance was investigated. The software and relationship between kinematic parameters and pantograph performance are helpful to pantograph designers.
한형석(Han Hyung-Suk),경진호(Kyung Jin-Ho),송달호(Song Dahl-Ho),배정찬(Bae Jung-Chan) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Conceptual design of the pantograph for high speed trains of 350㎞/h is introduced. The aims to be accomplished in the concept design are the good dynamic performance, low noise, aero-dynamic stability. The resulting mechanism of the pantograph have single-arm type structure with bebel gears to reduce noise sources, symmetric structure for the aero-dynamic stability and the special panhead assembly to obtain good dynamic performances.
알루미늄 AA5052 판재의 이형압연 시 집합조직 및 미세조직 발달에 미치는 윤활의 영향
박은수 ( Eun Soo Park ),강형구 ( Hyung Gu Kang ),허무영 ( Moo Young Huh ),김휘준 ( Hwi Jun Kim ),배정찬 ( Jung Chan Bae ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.6
The effect of lubrication on the evolution of strain states during shape rolling in AA5052 sheet was studied by the finite element method (FEM) simulation. The strain states calculated by FEM were verified by texture analysis. Shape rolling with and without lubrication produces shape-rolled samples in fairly similar outer shapes, since the distribution of normal strain components is nearly independent of the lubrication condition. In contrast, the distribution of shear strain components strongly depends on the lubrication condition. Shape rolling without lubrication gives rise to the development of strong shear strain gradients leading to the formation of highly inhomogenous textures and microstructures. The {011}//ND fiber develops during rolling with the operation of plane strain plus ε22. (Received January 14, 2009)