Page 55 - MSAM-1-3

Materials Science in Additive Manufacturing Characterization of TPMS structures

A B geometric parameters were fabricated for microstructural
characterization. The samples were designated as A0-A0.8,
B0-B0.8, C0-C0.8, D0-D0.8, E0-E0.8, and F1-F4. An
illustration of the orientation, sample dimensions, and
distribution within the substrate for these Schwarz-P
structures is shown in Figure 5A. In this study, the laser
power, scanning speed, and printing layer thickness were
90 W, 1100 mm/s, and 30 μm, respectively. The oxygen
content was less than 0.1%. After printing, F1 and F3 were
immediately cut by wire electrical discharge machining
C D (WEDM), whereas the remaining samples were heat
treated to relieve the residual thermal stress before cutting.
Figure 5B illustrates the stress-relief heat treatment
process. The geometric parameters and corresponding
theoretical porosities are listed in Table 2. Here, we
assumed that the width of the melt track would not change

Table 1. Composition of Ti6Al4V powder
Main ingredients Ti Al V
Figure 3. Model and its printing toolpaths generated by different methods.
(A) STL model of TPMS Schwarz-P structure. Toolpaths generated by Content/% Bal 5.50-6.75 3.50-4.50
(B) our method, (C) Magics without spot compensation and thin-wall Minor ingredients Fe C N H O
optimization, and (D) Magics with spot compensation and thin-wall
optimization. Content/% ≤ont ≤onte ≤onte ≤onten ≤ont

Figure 4. Material and Ti150 machine.

A B

Figure 5. (A) An illustration of the orientation, sample dimensions, and distribution within the substrate for the fabricated samples. (B) An illustration of
the stress relief heat treatment to the fabricated samples.

Volume 1 Issue 3 (2022) 4 http://doi.org/10.18063/msam.v1i3.17