CHARACTERIZATION OF THE SURFACE TOPOGRAPHY OF THE TI-6AL-4V ALLOY FABRICATED BY LASER POWDER BED FUSION

Authors : Samira Mohagheghi

Pages : 1034-1046

Doi:10.21923/jesd.1706211

View : 71 | Download : 177

Publication Date : 2025-12-30

Article Type : Research Paper

Abstract :Laser powder bed fusion (L-PBF) is a class of additive manufacturing processes in which a high-energy laser selectively melts layers of metallic powder to fabricate three-dimensional components. While L-PBF enables significant advancements in the manufacturing of complex geometries, poor surface quality of the as-built parts is still a drawback of the process. High surface roughness in as-built parts is primarily caused by the complex thermal history during the melting, solidification, and cooling processes. In this study, rectangular samples were fabricated from Ti-6Al-4V powder by the L-PBF process. Surface topography of the samples in as-build state, both top and side surfaces, was characterized using a surface roughness tester and a scanning electron microscope (SEM). The origins of surface roughness were found to differ significantly between the two orientations. On the side surfaces, roughness is predominantly due to the attachment of partially melted powder particles. In contrast, the top surface roughness is influenced by several defects, with balling phenomena playing a major role in generating highly rough surfaces.
Keywords : Eklemeli İmalat, Lazer Toz Yatak Füzyon, Ti-6Al-4V, Yüzey Pürüzlülüğü

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