Abstract
This paper explores the influence of sample thickness and build orientation on the microstructure and mechanical properties of electron beam melting (EBM) additive manufactured Ti-6Al-4V titanium alloy and compared to previously published work on SLM-processed material. In particular, the various mechanical properties (tensile yield strength, ultimate tensile strength) were investigated with attempts to correlate with various microstructural features, including lamellae thickness, porosity and the size of prior-beta grains. However, it is shown that the surface exerts a dominant effect on mechanical properties with as-deposited surfaces. These observations provide the possibility for the further improvement of processing/property relations with as-deposited surfaces.
Highlights
Additive manufacturing (AM) has recently become a very popular and widely used method of component production as it offers many advantages in comparison to conventional methods of metal manufacturing
The present work primarily reports the effects of changes in build orientations for the electron beam melting (EBM) samples because recent similar work has already been published for selective laser melting (SLM) [13], comparisons will be provided throughout this paper
Examples of stress-strain curves obtained from three measurements of the as-deposited flat samples with thickness of 1 mm and orientation ZXY are depicted in Figure 5 for the EBM-processed samples
Summary
Additive manufacturing (AM) has recently become a very popular and widely used method of component production as it offers many advantages in comparison to conventional methods of metal manufacturing. It can be cost-effective for small batches, is environmentally friendly and time-saving, while providing almost no restrictions on shape, (desired) porosity, or dimensional requirements [1,2]. Titanium implants are mostly manufactured by a powder bed fusion process like selective laser melting (SLM) or electron beam melting (EBM). The EBM method requires a vacuum chamber while SLM is usually conducted in an inert-gas protective atmosphere
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