PSI - Issue 42

Aditya Pandey et al. / Procedia Structural Integrity 42 (2022) 1017–1024

1022

6

Pandey et al. / Structural Integrity Procedia 00 (2019) 000–000

Fig. 6. Fractured surfaces of at di ff erent conditions, (a, b) as-build, (c) heat-treated with macrograph and local magnification

(a)

(b)

Top Face

Optical Microscopic Image

Melt Pool Analysis

Side Face

Build Direction

(c)

(d)

Width

Melt Pool Tracks

Depth

θ = 67 o

Hatch Space

50 µm

50 µm

Fig. 7. (a) AM printed sample (b), Optical image and (c, d) melt pool shapes

from first track to fourth track along the scanning direction. A continuous travelling laser track was formed, where next track overlap with the previously deposited tack. A noticeable increment in the melt pool size was observed after each layer of deposition which is due to the heat accumulation. The cross-sectional (melt pool depth, width and hatch space) images of the laser tracks were then used to validate the FE model. The dimensions of the melt pool obtained from FE simulation were compared with the experimental results, as shown in Figure 8e. The simulated results, listed in Table 4, were within an acceptable error range of ± 6 µ m. It is thus established that the developed numerical model generated an acceptable result that can further be used to study the e ff ect of manufacturing process parameters, the microstructural aspects, the generated residual stresses and the shape distortion analysis.