PSI - Issue 14

Anigani Sudarshan Reddy et al. / Procedia Structural Integrity 14 (2019) 449–466 Author name / Structural Integrity Procedia 00 (2018) 000–000

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comprising mainly  -phase laths with little or no  phase present. In this study, all the five alloys show a uniformly fused weld pools without any regions of unmelted particles or lack of fusion.

a

c

Maraging steel Porosity-0.4%

b

IN718 Porosity-0.045%

CoCrMo Porosity-0.016%

100 µm

100 µm

100 µm

e

d

Ti6Al4V Porosity-0.3%

SS316L Porosity-0.047%

100 µm

100 µm

Fig. 4. Representative optical micrographs taken from the as printed DMLS samples (along the build direction) (a) IN718, (b) CoCrMo, (c) Maraging steel, (d) SS316L and (e) Ti6Al4V

CoCrMo

IN718

a

Maraging steel

b

c

⁓100 µm

⁓1 10 µ

⁓120 µm

⁓100 µm

⁓8 0 µ

⁓70 µm

200 µm

µm200

200 µm

e

Ti6Al4V

SS316L

d

⁓80 µm

⁓6 0µ m

200 µm

200 µm

Fig. 5. Representative optical micrographs taken from as printed DMLS samples after etching (along the build direction) (a) IN718, (b) CoCrMo, (c) Maraging steel, (d) SS316L and (e) Ti6Al4V