Abstract
Size and shape of the melt pool play an important role in the microstructure formation in materials additively manufactured by laser powder bed fusion (LPBF) techniques. It is an enormous challenge to determine them automatically in radiography image series taken during LPBF when the melt pool has a very low contrast to the surrounding base material. In this work, an approach solving this problem for Al alloys is presented. The melt pool is detected by a combination of different image processing methods and boundary conditions. The method developed in this work is demonstrated on high-speed radiography images taken at a synchrotron beamline during an in-situ LPBF experiment using an Al-Si alloy.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3502-3513 |
| Number of pages | 12 |
| Journal | Journal of Materials Research and Technology |
| Volume | 21 |
| DOIs | |
| State | Published - Nov 1 2022 |
Funding
The authors would like to thank the APS team, Drs. Cang Zhao and Kamel Fezzaa, for their great support on site. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Finally, we would like to thank the research group of Jozef Keckes from Leoben, Austria that the authors were allowed to perform microscopy of the samples in their labs.
Keywords
- Al alloy
- High-speed X-ray radiography
- Image processing
- Melt pool
- Selective laser melting
ASJC Scopus subject areas
- Ceramics and Composites
- Biomaterials
- Surfaces, Coatings and Films
- Metals and Alloys
