Abstract
The crystalline structure and mechanical properties of titanium 6Al 4V produced via selective laser sintering were compared to literature examples and to wrought samples. In total, three sets of samples were analyzed: wrought, as printed selective laser sintering samples with no post processing, and selective laser sintering samples that were further processed via hot isostatic pressing for final consolidation. Samples were sectioned to fit on graphitic resin pucks and cut from the build plane in two orthogonal planes. Images were taken using a TESCAN MIRA3 scanning electron microscope with electron backscatter diffraction analysis and samples were etched for optical analysis. Hardness of the samples was measured using a Vickers hardness indenter. The overall chemical composition of the samples, both AM and wrought, were similar as confirmed using energy dispersive spectroscopy. Beta grains were observed in a columnar orientation along the build direction, however, the grain orientation did not appear to affect the hardness of the sample. A small amount of grain growth was observed in the post processed samples as compared to the as printed samples.
Highlights
Today’s world of complex machinery coupled with increased costs presents new manufacturing challenges
This research is focused on a comparison of samples of titanium alloy (Ti64) created using an Additive Manufacturing (AM) technique known as selective laser sintering (SLS)
While pores are commonly associated with SLS according to the literature, the AM method used for these samples did not produce any viable voids and indicates that our samples will be consistent with performance standards for AM Ti-64 [23] [24]
Summary
Today’s world of complex machinery coupled with increased costs presents new manufacturing challenges. Traditional methods of manufacture generally require costly and time-consuming finishing processes before the final part is ready for use. The ability to design and create complex forms with little waste does not come without concern for quality control [1]. The positives of AM are great enough that both individuals and industry are leading the charge to create those quality control measures and discover new methods of production [2]. The combination of AM and Ti64 is popular due to the high demand in industry for the alloy and the cost associated with traditional manufacturing methods [3]
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