Ti-6Al-4V alloy has a wide range of applications, ranging from turbine blades that require smooth surfaces for aerodynamic purposes to biomedical implants, where a certain surface roughness promotes biomedical compatibility. Therefore, it would be advantageous if the high volumetric density is maintained while controlling the surface roughness during the LPBF of Ti-6Al-4V. In this study, the volumetric energy density is varied by independently changing the laser power and scan speed to document the changes in the relative sample density and surface roughness. The results where the energy density is similar but the process parameters are different are compared. For comparable energy density but higher laser power and scan speed, the relative density remained similar at approximately 99%. However, the surface roughness varies, and the maximum increase rate is approximately 172%. To investigate the cause of the increased surface roughness, a nonlinear finite element heat transfer analysis is performed to compare the maximum temperature, cooling rate, and lifetime of the melt pool with different process parameters.

Abstract
1. 서 론
2. 실험 방법
    2.1. 시료 제작
    2.2. 밀도 측정
    2.3. 표면 거칠기 측정
    2.4. 유한 요소 해석
3. 결과 및 고찰
4. 결 론
References

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