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Page 72
Volume 4
December 10-12, 2018
Rome, Italy
Nano Research & Applications
ISSN: 2471-9838
Advanced Materials 2018
Nano Engineering 2018
JOINT EVENT
22
nd
International Conference on
Advanced Materials
and Simulation
&
22
nd
Edition of International Conference on
Nano Engineering &
Technology
T
he Electron BeamMelting (EBM) is one of the most promising
ALM technologies, which utilizes a high-energy electron
beam, as a moving heat source, in order to melt and fuse (by
rapid self-cooling) metal powder and produce parts in a layer-
building fashion. Anyway many technical aspects concerning
the quality of EBM produced components are still industrial open
items and studies need to be carried out. The objective of this
study is to evaluate the distribution and the features of porosity
defects generated during the EBM process, at this aim a simple
test case, consisting in rectangular parallelepiped (50x10x10
mm) samples manufactured in Ti6Al4V, was chosen (Figure 1). A
suitable DOE was developed in order to investigate the effect of
the following intra-build process parameters on porosity: Samples
orientation (fig.2): samples were built according to n.4 different
orientations: x, y, z (90°) and 45°. The x and y oriented samples
were built horizontally and they were, respectively, parallel and
perpendicular to the rake movement direction. The 90° oriented
samples were built vertically Location of the sample in layer
(fig.3): the group of samples shown in Figure 4a was built in n.5
different zones in the x-y plane which are named hereafter: Z1, Z2,
Z3, Z4 and Z5. The Z5 zone was the central one while all the other
zones were representative of the four corners of the x-y plane.
Such configuration was chosen in order to guarantee a high build
envelope symmetry. Height in the build chamber (fig.4): the group
of samples shown in 2b was built at n. 3 different levels in the
build chamber which are named hereafter: h1, h2 and h3. More in
detail, the h1 level starts at z=40 mm, the h2 level starts at z=170
mm and the h3 level starts at z=300 mm.
c.pirozzi@cira.itC Pirozzi, R Borrelli
and
S Franchitti
CIRA Italian Center of Aerospace Research
Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C7-028
Study on porosity defects of EB Med Ti64
components by tomographic analyisis