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일방향응고 초내열합금에서 MC 탄화물 형상에 관한 연구
김승언,조창용,김학민,Kim, Seung-Eon,Jo, Chang-Yong,Kim, Hak-Min 한국기계연구원 1990 기계연구원소보 Vol.20 No.-
The morphologies of MC carbides (M stands for metal) and creep-rupture properties in directionally solidified Rene 80 having standard and Hf-modified chemistries were studied. It was found that Hf depressed the melting point, $\gamma$- $\gamma$’ eutectic temperature and $\gamma$’ solvus of nickel-base superalloy Rene 80, but did not depress MC carbide forming temperature. The morphologies of MC carbides depended upon solidification sequence, which led to blocky type in the early stage and script type in the late stage of solidification. Creep failure occurs through the crack initiation at the transverse components of longitudinal grain boundaries or interdendritic carbides in directionally solidified superalloys. It could be concluded MC carbide morphologies played an important role in creep properties of DS superalloys, that is, Hf additions increased the creep ductilities and lives of Rene 80.
김승언,정희원,현용택,김성준,이용태,Kim, Seung-Eon,Jeong, Hui-Won,Hyeon, Yong-Taek,Kim, Seong-Jun,Lee, Yong-Tae 한국기계연구원 1999 硏究論文集 Vol.29 No.-
A new titanium alloy system. Ti-xFe-ySi (x,y=0-4 wt%). was designed and characterized with the point at low cost and high strength for casting applications. Fe improved room and elevated temperature mechanical properties owing to solid solution hardening and beta phase stabilization. Si yielded titanium silicides and Si addition over 1 wt% resulted in poor ductility due to coarse silicide chains at prior beta boundaries. The optimum composition was found to be Ti-4Fe-(0.5-1)Si in the viewpoint of tensile strength and ductility which are comparable to the Ti-6Al-4V. The metal-mould reaction was also examined for Ti-xFe and Ti-xSi binary alloy system. The thickness of surface reaction layer w as not affected significantly with Fe content, while it was decreased with Si content. In the Ti-4Si alloy, no reaction layer was found. The depth of surface hardening layer was about $200\mum$ regardless of the mould materials.
3D Printing 출력물의 생산 효율 향상을 위한 최적의 출력조건에 대한 연구
김성기(SeongGi Kim),김승언(SeungEon Kim),김찬중(ChanJung Kim),김학준(HakJun Kim),정상민(SangMin Chung),지승한(SeungHan Ji) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
FDM 방식으로 제작된 3D printing 제품은 접근성이 좋아 많은 산업 분야에서 다양하게 활용되고 있다. 하지만 FDM 방식은 출력 시간이 길고, 인장강도가 낮은 단점이 있다. 이와 같은 문제를 해결하기 위해 3D printing에 대한 연구가 지속적으로 이루어지고 있다. 본 연구에서는 3D printing 출력물의 인장강도와 출력 품질은 향상시키고, 출력 시간, 재료 소모량은 줄여 생산 효율을 높이기 위해 내부 채움 밀도, 출력 속도 조건을 고려해 최적의 출력 조건 도출에 대한 연구를 진행하였다. 실험 결과 생산 효율을 높일 수 있는 최적의 조건은 내부 채움 밀도 60%, 출력 속도 60mm/sec이다. 3D printing products manufactured by FDM method are widely used in many industries due to their good accessibility. In order to solve this problem, research on 3D printing is continuously being made. In this study, in order to improve the tensile strength and print quality of 3D printing prints and to increase production efficiency by reducing printing time and material consumption, a study was conducted on deriving optimal print conditions considering the conditions of infill density and printing speed. As a result of the experiment, the optimal conditions to increase production efficiency are 60% of infill density and 60mm/sec of printing speed.