Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Deposition Characteristics and Mechanical Properties of Stainless Steel 316L Fabricated via Directed Energy Deposition

에너지 제어 용착을 이용한 스테인리스 316L의 적층 특성 및 기계적 물성 평가

  • Yang, Seung-weon (Department of Ocean Advanced Materials convergence Eng., Korea Maritime & Ocean University) ;
  • Lee, Hyub (Intelligent Manufacturing R&D Department, Korea Institute of Industrial technology(KITECH)) ;
  • Shim, Do-Sik (Department of Ocean Advanced Materials convergence Eng., Korea Maritime & Ocean University)
  • Received : 2020.11.17
  • Accepted : 2021.04.09
  • Published : 2021.06.30
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Abstract

Directed energy deposition (DED) is an additive manufacturing technology involving a focused high-power laser or electron beam propagating over the substrate, resulting in melt pool formation while simultaneously supplying metal powder to the melt pool area to deposit the material. DED is performed to repair and strengthen parts in various applications, as it can be easily integrate local area cladding and cross-material deposition. In this study, we characterize stainless steel 316 L parts fabricated via DED based on various deposition conditions and geometries to widen the application of DED. The deposition characteristics are investigated by varying the laser power and powder feed rate. Multilayer deposition with a laser power of 362 W and a powder feed rate of 6.61 g/min indicate a height closest to the design value while affording high surface quality. The microhardness of the specimen increases from the top to the bottom of the deposited area. Tensile tests of specimens with two different deposition directions indicate that horizontally long specimens with respect to a substrate demonstrate a higher ultimate tensile strength and yield strength than vertically long specimens with lower elongation.

Keywords

Acknowledgement

이 논문은 2020년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원(NO. 20193310100030, 3D 프린팅 공정 제어 및 설계 최적화 기법(DfAM) 적용을 통한 F급 이상의 고효율 냉각터빈 고운부품 기술 개발)과 한국생산기술연구원 기관주요사업 "Add-on 모듈 탑재를 통한 지능형 뿌리공정 기술개발(kitech EO-20-0017)"의 지원을 받아 수행된 연구임.

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