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On the melt pool dynamic of voxel-controlled metal matrix composites via hybrid additive manufacturing: Laser powder bed fusion and ink-jetting

Journal Article · · Journal of Manufacturing Processes
 [1];  [2];  [3];  [3];  [4]
  1. Oregon State Univ., Corvallis, OR (United States); Advanced Technology and Manufacturing Institute (ATAMI), Corvallis, OR (United States); OSTI
  2. Phosio Corporation, Corvallis, OR (United States)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Oregon State Univ., Corvallis, OR (United States); Advanced Technology and Manufacturing Institute (ATAMI), Corvallis, OR (United States)
In this study, the effect of the addition of reinforcement nanoparticles to the 316L matrix by adopting ex-situ and in-situ method (drop on demand jetting) to produce 316L/Al2O3 nanocomposite was investigated. In the ex-situ method, the Al2O3 nanoparticles (NPs) were lightly mixed with 316L powder and processed by laser powder bed fusion. In the in-situ method, an ethanol-based ink containing Al13 nanoclusters (NCs) was added to 316L powder and then processed by laser. Both ex-situ and in-situ method produced nanocomposites with Al-Si-Mn-O-enriched precipitations within the 316L matrix. The addition of NPs/NCs to the 316L matrix, altered the geometrical characteristic of the single-track melt pools. At the same laser power, with increasing the amount of Al2O3 NPs and Al13 NCs the melt pool deepened due to reduced thermal conductivity and prolonged liquid presence. Further, as a result, 316L/1 wt% Al13 NCs deposited single track showed larger grains in comparison to 316L single track. At a high laser power of 150W, the Marangoni flow and the buoyancy force caused the nanoparticles to agglomerate and float to the top surface of tracks; therefore, the wt% fraction of precipitation was drastically reduced due to the loss of Al. The 316L/Al2O3 NPs and 316L/Al13 NCs exhibited the microhardness of 285 ± 13 HV and 293 ± 7 HV, respectively, higher than the deposited 316L single track, 265 ± 15 HV. Lastly, a hybrid LPBF+ink-jet printer was adopted to selectively change the composition of different zones by adding Al13 NCs ink to 316L and producing a voxel-controlled metal matrix composite.
Research Organization:
American Institute of Chemical Engineers (AIChE), New York, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007888
OSTI ID:
2418560
Alternate ID(s):
OSTI ID: 1926751
Journal Information:
Journal of Manufacturing Processes, Journal Name: Journal of Manufacturing Processes Journal Issue: C Vol. 89; ISSN 1526-6125
Publisher:
Society of Manufacturing Engineers; ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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