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레이저 직접 용착공정으로 형성된 스테인레스/인코넬 합금 계면의 미세조직 분석
엄영성,김경태,정수호,유지훈,양동열,최중호,심철용,안승준,Eom, Yeong Seong,Kim, Kyung Tae,Jung, Soo-Ho,Yu, Jihun,Yang, Dong Yeol,Choe, Jungho,Sim, Chul Yong,An, Seung Jun 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.3
The directed energy deposition (DED) process of metal 3D printing technologies has been treated as an effective method for welding, repairing, and even 3-dimensional building of machinery parts. In this study, stainless steel 316L (STS316L) and Inconel 625 (IN625) alloy powders are additively manufactured using the DED process, and the microstructure of the fabricated STS316L/IN625 sample is investigated. In particular, there are no secondary phases in the interface between STS316L and the IN625 alloy. The EDS and Vickers hardness results clearly show compositionally and mechanically transient layers a few tens of micrometers in thickness. Interestingly, several cracks are only observed in the STS 316L rather than in the IN625 alloy near the interface. In addition, small-sized voids 200-400 nm in diameter that look like trapped pores are present in both materials. The cracks present near the interface are formed by tensile stress in STS316L caused by the difference in the CTE (coefficient of thermal expansion) between the two materials during the DED process. These results can provide fundamental information for the fabrication of machinery parts that require joining of two materials, such as valves.
3D 프린팅 기술을 활용한 부품 유지보수를 위한 분류체계 데이터 구조의 개발
김태윤(Taeyun Kim),김장환(Janghwan Kim),박찬석(Chanseok Park),차무현(Moohyun Cha),심철용(Chul Yong Sim),명세현(Sehyun Myung),문두환(Duhwan Mun) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.4
To maintain parts using 3D printing technology, a part library management system is required which provides users with information about part function, manufacturing method, and inspection method as well as 3D CAD models used as an input file for 3D printing work. The part information and related files managed in the part library management system are described according to a predefined part classification scheme. In this paper, we propose a classification scheme data structure for the maintenance of parts using 3D printing technology. Then we develop a classification scheme for gaskets and o-rings according to the data structure. Finally, we construct part catalog data according to the classification scheme in the prototype part library management system and then perform experiments of retrieving part information and files from the system.