Abstract
Melt flow plays a critical role in laser metal additive manufacturing, yet the melt flow behavior within the melt pool has never been explicitly presented. Here, we report in-situ characterization of melt-flow dynamics in every location of the entire melt pool in laser metal additive manufacturing by populous and uniformly dispersed micro-tracers through in-situ high-resolution synchrotron x-ray imaging. The location-specific flow patterns in different regions of the melt pool are revealed and quantified under both conduction-mode and depression-mode melting. The physical processes at different locations in the melt pool are identified. The full-field melt-flow mapping approach reported here opens the way to study the detailed melt-flow dynamics under real additive manufacturing conditions. The results obtained provide crucial insights into laser additive manufacturing processes and are critical for developing reliable high-fidelity computational models.
| Original language | English |
|---|---|
| Article number | 100939 |
| Journal | Additive Manufacturing |
| Volume | 31 |
| DOIs | |
| State | Published - Jan 2020 |
| Externally published | Yes |
Funding
The authors would like to thank Alex Deriy at the APS for his help on the beamline experiments. Q.G. M.Q. L.X. S.M.H.H. L.I.E. and L.C. acknowledge the financial support by US National Science Foundation (Award No. 1762477). C.Z. N.D.P. K.F, and T.S. thank the Laboratory Directed Research and Development (LDRD) funding from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-06CH11357. 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. The authors would like to thank Alex Deriy at the APS for his help on the beamline experiments. Q.G., M.Q., L.X., S.M.H.H., L.I.E., and L.C. acknowledge the financial support by US National Science Foundation (Award No. 1762477 ). C.Z., N.D.P., K.F, and T.S. thank the Laboratory Directed Research and Development (LDRD) funding from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-06CH11357. 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. Appendix A
| Funders | Funder number |
|---|---|
| Advanced Photon Source | |
| Alex Deriy | |
| DOE Office of Science | |
| K.F | |
| M.Q. | |
| Office of Science User Facility operated | |
| US National Science Foundation | 1762477 |
| National Science Foundation | 2011354 |
| U.S. Department of Energy | DE-AC02-06CH11357 |
| Office of Science | |
| Argonne National Laboratory | |
| Laboratory Directed Research and Development |
Keywords
- Laser processing
- Melt flow
- Metal additive manufacturing
- Powder bed fusion
- X-ray imaging
