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        • KCI등재

          Cu-6Ni-3Mn-6Sn 합금의 미세조직변화에 미치는 첨가원소의 영향

          김창주,박영구,한승전,서승필,이정무 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.6

          The physical and mechanical properties of the Cu-6%Ni-3%Mn-6%Sn-0.5%X(Al,Ti,Si)alloys and Cu-6Ni-3Mn-6Sn alloy were strongly dependent on aging condition. The effects of additions of Al, Si and Ti on the mechanical properties and formation of discontinuous precipitate in the alloy have been investigated. In this alloy discontinuous precipitation occurs during aging at 350℃ for 405 min. But addition of Si and Ti in this alloy, discontinuous precipitation occurs much less than the Cu-6Ni-3Mn-6Sn alloy and grain size is decreased. For Cu-6Ni-3Mn-6Sn-X alloy system, spinodal decomposition and transition of metastable phase does not occur but discontinuous precipitation decreased with addition of 0.5% Si, Ti and Al respectively. Also grain size is reduced by addition of 0.5% Si and Ti on Cu-6Ni-3Mn-6Sn alloy because of forming interphase in grain boundary.

        • KCI등재

          Cu-6Ni-2Sn 및 Cu-6Ni-2Sn-0.6Si-0.6Zn 합금의 고온 변형 특성

          김창주,이종환,이정무,한승전,정윤철 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.3

          The high temperature deformation behaviors of Cu-6 wt.%Ni-2 wt.%Sn and Cu-6 wt.%Ni-2 wt.%Sn-0.6 wt.%Si-0.6 wt.%Zn alloys were investigated in the temperature range of 550-900℃ at strain rates between 0.05-1.5s^(-1) by hot compression test. Flow curves were analysed by hyperbolic sine relationship and the activation energy of deformation was determined at high and low temperature ranges. The activation energy of deformation for Cu-6 wt.%Ni-2 wt.%Sn alloy exhibits almost the same as that for Cu-6 wt.%Ni-2 wt.%Sn-0.6 wt.%Si-0.6 wt.%Zn alloy in the low temperature range below 700℃. While, in the high temperature range above 700℃ the activation energy of deformation for Cu-6 wt.%Ni-2 wt.%Sn alloy exhibits much higher value than that for Cu-6 wt.%Ni-2 wt.%Sn-0.6 wt.%Si-0.6 wt.%Zn alloy. The difference of the activation energy of deformation was attributed to the presence of Sn-rich inclusion in the matrix.

        • SCOPUSKCI등재

          과시효처리된 7075 AI합금에 있어서 압연조건이 재결정조직과 강도에 미치는 영향

          김창주,김형욱,Kim, Chang-Ju,Kim, Hyeong-Uk 한국재료학회 1994 한국재료학회지 Vol.4 No.2

          항공기용 고력 AI합금인 7075 AI합금의 물성개선을 위한 가공열처리 방안으로서 과시효처리후 온간 및 냉간 압연에 의한 소성가공이 재결정조직과 강도에 미치는 영향에 대하여 연구하였다. 소송가공후 재결정처리에 의해 결정립을 미세화하는 공정에서 소성가공 전 과시효를 함으로써 재결정립의 미세화 정도는 더욱 현저하였다. 이는 과시효에 의한 조대한 석출물이 재결정처리시 핵생성 site로서 작용하였음을 의미한다. 본 연구에서 항복강도와 재결정립의 크기와는 Hall-petch식을 만족하지 않았으며 이는 등축이 아닌 연신된 결정조직에 기인된 결과로 보이며, 항복강도가 재결정립의 종횡비에 직선적으로 비례하였다. 또한 결정립 미세화를 통한 강도, 인성향상을 목적으로 하는 TMT(Thermo mechanical Treatment)공정에서는 심한 냉간가공에 의해서보다는 온간에서의 소성가공이 바람직함을 알 수 있었다. We studied on the effects of hot-worm rolling on recrystalized structures and tensile strength in over-aged 7075 A1 alloy, to develop the process for improving properties. It showed more clear effect of the grain refinement with over-aging before plastic deformation. That means, the coarse precipitates from over-aging play a roll as nucleation sites in the course of recrystallization. And on this study, the relations between yield strength and grain size was not satisfied with Hall-Petch equation because of the elongated structure, but the yield strength is proportional to aspect ratio of grains. In TMT process for improving strength and toughness, the worm working is available for increase of those properties than cold working.

        • KCI등재

          Cu-(9-X)Ni-XMn-6Sn 합금의 미세조직과 경도에 미치는 시효의 영향

          김창주,박영구,한승전,서승필,이정무 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.12

          Decomposition precess of α phage in Cu-(9-X)Ni-XMn-6Sn alloy has been investigated by means of side band observation around (200)_α X-ray diffraction peak, hardness, and microstructural observations. When the specimens are aged below 400℃ after solution treatment, the supersaturated solid solution α' is decomposed by three stages. When the specimens are aged above about 500℃, however, the equilibrium cellular structure consisting of α phase and DO_3 type superlattice forms from the initial stage of transformation without any reactions such as spinodal decomposition and transition of metastable phase. In Cu-8Ni-1Mn-6Sn and Cu-7Ni-2Mn-6Sn alloys, the first stage and the second stage in the decomposition of supersaturated solid solution are occurred at the same time. And all stages are occurred earlier than Cu-9Ni-6Sn alloy.

        • KCI등재

          Cu-Ni-Sn 합금의 상변태거동 및 기계적 성질에 미치는 Mn 첨가효과

          김창주,이정무,한승전,정윤철 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.8

          The effects of Mn addition on phase transformation behavior and mechanical properties of Cu-(9-x)Ni-xMn-6Sn alloys were investigated. The microstructure and transformation behavior changed with increasing Mn content and heating temperature. The Mn free alloy decomposed spinodally by aging at 350℃ and followed by formation of a metastable γ′ phase which accompanies the increase of mechanical characteristics with increasing Mn content, however, the γ′ phase disappeared and a stable γ phase was dominantly precipitated. When the specimens were aged above 450℃, equilibrium γ phase formed from the initial stage of transformation without any reaction such as spinodal decomposition and transformation of a metastable phase. Therefore, addition of Mn and increasing heating temperature suppressed the hardening effect of alloy in the early stage of aging, and decreased the tensile strength.

        • MARKETING PLAN for PENIFE

          김창주,이동철,진금옥,김무만,천명환 대한경영학회 2006 대한경영학회 학술발표대회 발표논문집 Vol.- No.-

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          PENINF International Ltd(그림1.1)은 회사 이름 그대로 펜과 칼의 기능을 하나로 통합한 신제품을 생산하는 중소기업이다. 한 쪽은 펜, 그리고 다른 한 쪽은 칼의 기능을 가진 PENIFE의 상품은 일상생황에 있어 편리하며, 실용적이기도 하다. 2004년에 설립된 이 회사는 타 경쟁사들이 진출하기 전에, UK시장에서 시장의 우위성을 점유하려고 노력하고 있다. 그들은 다음과 같은 목표를 설정하고 있다. (1) 총판매매출이익율25%(2.5 planning assumption을 참고 해주십시오:p.13) (2) 경쟁우위를 점하기 위해 차별화 된 효용을 전달할 수 있는 매력적인 구조 확립. (3) UK 틈새시장에서 혁신적인 PENIFE 생산자로서 인식될 수 있는 마케팅 전략. (4) 그들은 Model A(Pop-out style)와 Model B(Push out style)라는 두 가지 상품을 생산하고 있으며, 그 가격은 £2.49(5,000원:1£=2,000 상정시 이하동일)이다.

        • KCI등재

          Cu-6wt%Ni-4wt%Sn 합금의 기계적 전기적 성질에 미치는 Mm (Ce, La, etc) 의 미량 첨가 효과

          김창주,이정무,한승전,정윤철,변상섭 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.10

          The effect of small addition of Mm(Ce, La, etc) on the mechanical properties and electrical resistivity of Cu-6Ni-4Sn(wt%) alloy has been investigated by means of microstructural observation as well as the tensile and electrical resistivity tests. The Cu-6Ni-4Sn alloy was found not to strengthen by an aging treatment after cold working but the tensile strength of this alloy was decreased with increasing the aging temperature, indicating that the spinodal decomposition didn't occur in the α supersaturated solid solution. The grain growth was significantly suppressed by the small addition of Mm, resulting into the substantially enhanced mechanical properties. The tensile strength and elongation of the Cu-6Ni-4Sn-0.05Mm alloy was found to increase with increasing aging temperature at low temperature range possibly due to the spinodal decomposition and CeNi₄Sn₂ precipitation. The electrical resisitivity was significantly reduced by the small addition of Mm. In all of the alloys examined, the electrical resistivity was reduced by raising the aging temperature. The Mm addition is found to reduce the electrical resistivity more rapidly as the aging temperature increases.

        • KCI등재

          연속 주조한 Cu-9Ni-6Sn 합금의 열처리에 따른 가공성 및 미세조직변화

          김창주,이정무,한승전,정윤철,김홍일 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7

          The effects of Heat-treatment on the mechanical workability of continuously cast Cu-9Ni-6Sn alloys have been investigated and the following results were obtained. The mechanical workability of Cu-9Ni-6Sn alloys are strongly dependent on the temperature of heating. The surface cracks of specimen were not produced over the temperature of 650℃ but occurred below 650℃. Sn-rich inclusion formed during solidification influenced the mechanical workability. Especially Sn-rich inclusion at grain-boundary induced crack initiation. Over the holding temperature of 650℃, the grain boundary pore made by removing inclusion initiated crack because the pores acted as defect at the grain boundary. Below 650℃, Sn-rich inclusions were still remained at the grain boundary, therefore workability improved due to reduction of defects at the grain boundary.

        • KCI등재
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