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.

Abstract
1. 서 론
2. 실험 방법
    2.1. 적층 제조 시편 준비
    2.2. 상대밀도 및 표면 거칠기 측정
    2.3. 균질화 기법을 이용한 유한 요소 해석
3. 결과 및 고찰
    3.1. 공정 변수에 따른 상대 밀도 및 표면 거칠기
    3.2. 균질화 기법 검증
    3.2. 압축 시험과 해석 데이터간의 비교 분석
4. 결 론
감사의 글
References

• 김지윤(University of Central Florida, Department of Materials Science and Enginering, 인하대학교 항공우주공학과) | Ji-Yoon Kim (Department of Materials Science and Engineering, University of Central Florida)
• 우정민(University of Central Florida, Department of Materials Science and Enginering, 인하대학교 항공우주공학과) | Jeongmin Woo (Department of Materials Science and Engineering, University of Central Florida)
• 손용호(University of Central Florida, Department of Materials Science and Enginering) | Yongho Sohn (Department of Materials Science and Engineering, University of Central Florida)
• 김정호(인하대학교 항공우주공학과) | Jeong Ho Kim (Department of Aerospace Engineering, Inha University)
• 이기안(인하대학교 신소재공학과) | Kee-Ahn Lee (Department of Materials Science and Engineering, Inha University) Corresponding Author