Pore evolution mechanisms during directed energy deposition additive manufacturing
Research Complex at Harwell · University College London · +6 more institutions
Abstract
Porosity in directed energy deposition (DED) deteriorates mechanical performances of components, limiting safety-critical applications. However, how pores arise and evolve in DED remains unclear. Here, we reveal pore evolution mechanisms during DED using in situ X-ray imaging and multi-physics modelling. We quantify five mechanisms contributing to pore formation, migration, pushing, growth, removal and entrapment: (i) bubbles from gas atomised powder enter the melt pool, and then migrate circularly or laterally; (ii) small bubbles can escape from the pool surface, or coalesce into larger bubbles, or be entrapped by solidification fronts; (iii) larger coalesced bubbles can remain in the pool for long periods,…
Citation impact
- FWCI
- 26.39
- Percentile
- 100%
- References
- 63
Authors
15- KZKai ZhangCorresponding
Research Complex at Harwell, University College London
- YCYunhui Chen
European Synchrotron Radiation Facility, Research Complex at Harwell, University College London, RMIT University
- SMSebastian Marussi
Research Complex at Harwell, University College London
- XFXianqiang Fan
Research Complex at Harwell, University College London
- MFMaureen Fitzpatrick
European Synchrotron Radiation Facility, University College London
Topics & keywords
- Marangoni effect
- Porosity
- Buoyancy
- Surface energy
- Deposition (geology)
- Materials science
- Limiting
- Shear (geology)
- Affordable and clean energy
Funding
- ATAerospace Technology InstituteAward: 51689
- URUK Research and InnovationAwards: 51689, EP/P006566/1
- RARoyal Academy of EngineeringAward: CiET1819/10
- RRolls-RoyceAward: contract 51689
- ESEuropean Synchrotron Radiation FacilityAward: MA-4857
- EAEngineering and Physical Sciences Research CouncilAwards: EP/P006566/1, EP/S000828/2, EP/W037483/1, EP/P006566, EP/W006774/1, EP/P006566/1, EP/W00593X/1