PSI - Issue 56

Costanzo Bellini et al. / Procedia Structural Integrity 56 (2024) 19–25 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 2. Optical images of (a) virgin powders low magnification; (a’) virgin powders high magnification; (b) recycled powders low magnification; (b’) recycled powders high magnification.

Fig. 3. Optical micrographs showing the microstructure of virgin (a) and recycled (b) powders.

The etching process revealed that the microstructure of virgin powders was predominantly characterized by a fine and martensitic structure. This microstructure was primarily comprised of the α ' phase, which was distinguished by