Quiz: Metal Powder Craters

MaterialsMonday quiz for the MetalAM community 🤔 Have you ever seen such craters in metal powder and can you guess the cause ❓

In preparation for the last milestone meeting of our ReAddi research project, we made an astonishing discovery with frequently used 316L metal powder "refurbished" by Indutherm via their AC1000 air classifier and analyzed via SEM at wbk Institut für Produktionstechnik, KIT. No particles with these craters were found in the unused powder batch.

We have made some theories in internal discussions and also found a possible cause. Can you guess it or do you have another theory ❓

🤔 Craters from high-speed particle on particle collisions during the LPBF process
🤔 Oxides in the "spatter" powder
🤔 "Frozen waves" during particle surface remelting and solidification
🤔 Your own assumption in the comments 👇

More information about the ReAddi project (Intelligently controlled additive manufacturing process chain using simulative and experimentally determined component, material and process data): www.wbk.kit

The project partners of the ReAddi consortium:

  • Robert Bosch GmbH
  • Mercedes-Benz AG
  • EDAG Engineering GmbH
  • DMG Mori Additive
  • INTES Ingenieurgesellschaft für technische Software mbH
  • Heraeus Noblelight GmbH
  • Rosswag GmbH
  • Indutherm Gießtechnologie GmbH
  • QASS GmbH Qualität Automation Systeme Software
  • Simufact Engineering GmbH
  • USU Software AG
  • LPT
  • DMRC
  • Karlsruher Institut für Technologie (KIT), wbk Institut für Produktionstechnik

Further information:

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