Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Porosity on Mechanical Anisotropy of 316L Austenitic Stainless Steel Additively Manufactured by Selective Laser Melting

선택적 레이저 용융법으로 제조한 316L 스테인리스강의 기계적 이방성에 미치는 기공의 영향

  • Park, Jeong Min (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Jeon, Jin Myoung (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Kim, Jung Gi (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Seong, Yujin (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Park, Sun Hong (Materials Solution Research Group, RIST (Research Institute of Industrial Science and Technology)) ;
  • Kim, Hyoung Seop (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology))
  • 박정민 (포항공과대학교 신소재공학과) ;
  • 전진명 (포항공과대학교 신소재공학과) ;
  • 김정기 (포항공과대학교 신소재공학과) ;
  • 성유진 (포항공과대학교 신소재공학과) ;
  • 박순홍 (포항산업과학연구원 소재이용연구그룹) ;
  • 김형섭 (포항공과대학교 신소재공학과)
  • Received : 2018.12.04
  • Accepted : 2018.12.18
  • Published : 2018.12.28
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Abstract

Selective laser melting (SLM), a type of additive manufacturing (AM) technology, leads a global manufacturing trend by enabling the design of geometrically complex products with topology optimization for optimized performance. Using this method, three-dimensional (3D) computer-aided design (CAD) data components can be built up directly in a layer-by-layer fashion using a high-energy laser beam for the selective melting and rapid solidification of thin layers of metallic powders. Although there are considerable expectations that this novel process will overcome many traditional manufacturing process limits, some issues still exist in applying the SLM process to diverse metallic materials, particularly regarding the formation of porosity. This is a major processing-induced phenomenon, and frequently observed in almost all SLM-processed metallic components. In this study, we investigate the mechanical anisotropy of SLM-produced 316L stainless steel based on microstructural factors and highly-oriented porosity. Tensile tests are performed to investigate the microstructure and porosity effects on mechanical anisotropy in terms of both strength and ductility.

Keywords

References

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