Page 10 - MSAM-1-4

Materials Science in Additive Manufacturing Y O influence in heat-treated LPBF IN718 composite
2 3

in comparable or better mechanical properties than those calculated by dividing the length of the line by its number
reported by other literature as shown in our previous study of intersections. The diameter of the grain would then be
Luu et al. . equal to the diameter of the circle that has the same area as
[22]
The grain size was calculated using the line intersection the width × length.
method. The width and length of the grains would then be The size distributions of the precipitates were measured
using the ImageJ software. Multiple SEM images were
A B taken and the size of the precipitates in the images was
measured. The volume fraction, f , of the precipitates in the
p
samples was measured using Equation I.
4 d 3
p
3 2 N p (I)
f Ad
p
p
Where d is the mean diameter of the precipitates, N is
p
p
the number of precipitates in a given area, and A is the area
of the given area.
C D
3. Results and discussion
3.1. Microstructures of as-printed samples
SEM images comparing the microstructures of as-printed
samples are shown in Figure 5A and B. The microstructures
of both samples consist of a white color phase with a

Table 4. Labeling of IN718 and the composite samples
E
Sample ID Heat treatment Reinforcement
AP-0 As-printed Nil
AP-Y Y O 3
2
1075-0 Solutionized at 1075°C Nil
1075-Y Y O
2 3
1075A-0 Solutionized at 1075°C+Aged Nil
1075A-Y Y O
2 3
Figure 2. Photos of the powder mixture after 2(A), 4(B), 6(C), and 1275A-0 Solutionized at 1275°C+Aged Nil
8(D) hours of mixing. SEM image of the powder mixture after 8 h of 1275A-Y Y O
mixing (E). 2 3

A B

Figure 3. Solutionizing (A) and aging (B) profiles.

Volume 1 Issue 4 (2022) 4 https://doi.org/10.18063/msam.v1i4.25