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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
Presentation Title Variation in Density, Phase Constituents, Microstructure, Surface Roughness and Modulus/Hardness Observed from LPBF Parametric Study of Ti – 6 wt.% Al – 4 wt.% V Alloy
Author(s) Asif Mahmud, Jeongmin Woo, Holden Hyer, Ji-Yoon Kim, Thinh Huynh, Abhishek Mehta, Kee-Ahn Lee, Yongho Sohn
On-Site Speaker (Planned) Asif Mahmud
Abstract Scope Ti6Al4V alloy has a wide range of applications from aerospace to prosthetics, potentially requiring variation in physical and mechanical properties controlled by the laser powder bed fusion (LPBF) parameters. A wide range of volumetric energy density (VED), varied by independently changing laser power and scan speed of LPBF, was examined to document the changes in density, phase constituents, microstructure, surface roughness and modulus. VED associated with alloy density greater than 99.5% was found around 70 J/mm3 with phase constituents of acicular α’ phase, surface roughness of 10 µm, and elastic modulus of 118 GPa. Excessive VED yielded keyhole porosity, smoother surface down to 5 µm, α’/α and β phases, and higher modulus. VED lower than optimized was related to lack of fusion flaws, rough surface up to 37 µm, acicular α’ phase, and lower modulus. Changes in these characteristics are discussed with respect to LPBF parameters and solidification/cooling behavior.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Characterization, Titanium

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