Additive manufacturing of Inconel-625: from powder production to bulk samples printing Academic Article uri icon


  • Purpose For metal additive manufacturing, metallic powders are usually produced by vacuum induction gas atomization (VIGA) through the breakup of liquid metal into tiny droplets by gas jets. VIGA is considered a cost-effective technique to prepare feedstock. In VIGA, the quality and the morphology of the produced particles are mainly controlled by the gas pressure used during powder production, keeping the setup configuration constant. Design/methodology/approach In VIGA process for metallic additive manufacturing feedstock preparation, the quality and morphology of the powder particles are mainly controlled by the gas pressure used during powder production. Findings In this study, Inconel-625 feedstock was produced using a supersonic nozzle in a close-coupled gas atomization apparatus. Powder size distribution (PSD) was studied by varying the gas pressure. Originality/value The nonmonotonic but deterministic relationships were observed between gas pressure and PSD. It was found that the maximum 1545m percentage PSD, equivalent to 84%, was achieved at 29bar Argon gas pressure, which is suitable for the LPBF process. Following on, the produced powder particles were used to print tensile test specimens via LPBF along XY- and ZX-orientations by using laser power = 475 W, laser scanning speed = 800mm/s, powder layer thickness = 50m and hatch distance = 100m. The yield and tensile strengths were 9.45% and 13% higher than the ZX direction, while the samples printed in ZX direction resulted in 26.79% more elongation compared to XY-orientation.

published proceedings


author list (cited authors)

  • Rehman, A. U., Karakas, B., Mahmood, M. A., Basaran, B., Rehman, R. U., Kirac, M., ... Unal, R.

citation count

  • 2

complete list of authors

  • Rehman, Asif Ur||Karakas, Burak||Mahmood, Muhammad Arif||Basaran, Berkan||Rehman, Rashid Ur||Kirac, Mertcan||Khraisheh, Marwan||Salamci, Metin Uymaz||Unal, Rahmi

publication date

  • 2023