Two-Step Laser Post-Processing for the Surface Functionalization of Additively Manufactured Ti-6Al-4V Parts

Laser powder bed fusion (LPBF) is one of the additive manufacturing methods used
to build metallic parts. To achieve the design requirements, the LPBF process chain can become
long and complex. This work aimed to use dierent laser techniques as alternatives to traditional
post-processes, in order to add value and new perspectives on applications, while also simplifying the
process chain. Laser polishing (LP) with a continuous wave laser was used for improving the surface
quality of the parts, and an ultrashort pulse laser was applied to functionalize it. Each technique,
individually and combined, was performed following distinct stages of the process chain. In addition
to removing asperities, the samples after LP had contact angles within the hydrophilic range.
In contrast, all functionalized surfaces presented hydrophobicity. Oxides were predominant on
these samples, while prior to the second laser processing step, the presence of TiN and TiC was
also observed. The cell growth viability study indicated that any post-process applied did not
negatively aect the biocompatibility of the parts. The presented approach was considered a suitable
... mehr
post-process option for achieving dierent functionalities in localized areas of the parts, for replacing
certain steps of the process chain, or a combination of both.