Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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A Study on the Optimal Design of Ti-6Al-4V Lattice Structure Manufactured by Laser Powder Bed Fusion Process

Laser Powder Bed Fusion 공정으로 제조된 Ti-6Al-4V 격자 구조물의 최적 설계 기법 연구

  • Ji-Yoon Kim (Department of Materials Science and Engineering, University of Central Florida) ;
  • Jeongmin Woo (Department of Materials Science and Engineering, University of Central Florida) ;
  • Yongho Sohn (Department of Materials Science and Engineering, University of Central Florida) ;
  • Jeong Ho Kim (Department of Aerospace Engineering, Inha University) ;
  • Kee-Ahn Lee (Department of Materials Science and Engineering, Inha University)
  • Received : 2023.04.16
  • Accepted : 2023.04.26
  • Published : 2023.04.28
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Abstract

The Ti-6Al-4V lattice structure is widely used in the aerospace industry owing to its high specific strength, specific stiffness, and energy absorption. The quality, performance, and surface roughness of the additively manufactured parts are significantly dependent on various process parameters. Therefore, it is important to study process parameter optimization for relative density and surface roughness control. Here, the part density and surface roughness are examined according to the hatching space, laser power, and scan rotation during laser-powder bed fusion (LPBF), and the optimal process parameters for LPBF are investigated. It has high density and low surface roughness in the specific process parameter ranges of hatching space (0.06-0.12 mm), laser power (225-325 W), and scan rotation (15°). In addition, to investigate the compressive behavior of the lattice structure, a finite element analysis is performed based on the homogenization method. Finite element analysis using the homogenization method indicates that the number of elements decreases from 437,710 to 27 and the analysis time decreases from 3,360 to 9 s. In addition, to verify the reliability of this method, stress-strain data from the compression test and analysis are compared.

Keywords

Acknowledgement

본 연구는 산업통상자원부 및 한국산업기술진흥원의 혁신성장 글로벌인재양성사업(P0008750, 스마트 제조 글로벌 인재 양성 사업)의 지원으로 수행되었으며 이에 감사드립니다.

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