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2022 | OriginalPaper | Chapter

Effect of Build Angle on Surface Roughness of High-Speed Selective Laser Melted Ti-6Al-4V Alloy

Authors : Eunhyeok Seo, Namhun Kim, Seung Ki Moon, Hyokyung Sung, Im Doo Jung

Published in: Proceedings of the 2nd International Conference on Advanced Surface Enhancement (INCASE 2021)

Publisher: Springer Singapore

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Abstract

Despite recent progress in achieving high mechanical properties of metal additive manufacturing, the low productivity represented by slow manufacturing speeds still remains a bottleneck of the technology. We improved the scanning speed of selective laser melting (SLM) with Ti-6Al-4V up to 1800 mm/s for high printing speed with affordable mechanical properties. In addition, the hot isostatic pressing (HIP) process was applied as post-treatment process to remove porosity of the high-speed printed SLM specimens. However, the HIP process caused a microstructural change from α′-lath martensite to a Widmanstӓtten α-lamellar structure. This microstructural change was most pronounced on the surface area and caused inter-lamellar fracture. Here, we investigate this phenomenon with microstructural and computational analysis. The results indicate that this deterioration phenomenon is highly dependent on surface roughness, which can be controlled with a build angle set-up.

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Metadata
Title
Effect of Build Angle on Surface Roughness of High-Speed Selective Laser Melted Ti-6Al-4V Alloy
Authors
Eunhyeok Seo
Namhun Kim
Seung Ki Moon
Hyokyung Sung
Im Doo Jung
Copyright Year
2022
Publisher
Springer Singapore
DOI
https://doi.org/10.1007/978-981-16-5763-4_23

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