Pore-lean directed energy deposition additive manufacturing through laser power modulation
Source abstract
Abstract
Directed energy deposition (DED) laser additive manufacturing (AM) is a promising technique for building complex components and performing repair applications. However, large defects can form through coalescence of argon bubbles from the feedstock powder, potentially reducing end-component mechanical performance. Here, we used correlative high-speed synchrotron X-ray and infrared imaging, coupled with multiphysics modelling to develop a strategy to control defect formation. We demonstrate that the bubble dynamics can be controlled by appropriately modulating the laser power, temporarily disrupting the Marangoni flow, enabling bubble release. The bubble control mechanisms discovered here provide a way to achieve defect-lean AM.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Additive Manufacturing and 3D Printing Technologies · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
Show source-provided references
1. Material-structure-performance integrated laser-metal additive manufacturing10.1126/science.abg1487 ↗
2. Correlative synchrotron X-ray imaging and diffraction of directed energy deposition additive manufacturing10.1016/j.actamat.2021.116777 ↗
3. Manipulating molten pool dynamics during metal 3D printing by ultrasound10.1063/5.0082461 ↗
4. Directed energy deposition (DED) additive manufacturing: physical characteristics, defects, challenges and applications10.1016/j.mattod.2021.03.020 ↗
5. Pore evolution mechanisms during directed energy deposition additive manufacturing10.1038/s41467-024-45913-9 ↗
6. Additive manufacturing of ultrafine-grained high-strength titanium alloys10.1038/s41586-019-1783-1 ↗
7. 3D printing of high-strength aluminium alloys10.1038/nature23894 ↗
8. Role of porosity defects in metal 3D printing: formation mechanisms, impacts on properties and mitigation strategies10.1016/j.mattod.2022.08.014 ↗
9. Laser additive manufacturing of metallic components: materials, processes and mechanisms10.1179/1743280411Y.0000000014 ↗
10. Assessment of the effect of isolated porosity defects on the fatigue performance of additive manufactured titanium alloy
11. Measuring the nucleation of hydrogen porosity during the solidification of aluminium-copper alloys10.1016/S1359-6462(96)00411-3 ↗
12. Keyhole fluctuation and pore formation mechanisms during laser powder bed fusion additive manufacturing10.1038/s41467-022-28694-x ↗
13. Critical instability at moving keyhole tip generates porosity in laser melting10.1126/science.abd1587 ↗
14. Machine learning–aided real-time detection of keyhole pore generation in laser powder bed fusion10.1126/science.add4667 ↗
15. Pore formation driven by particle impact in laser powder-blown directed energy deposition10.1093/pnasnexus/pgad178 ↗
16. Pore elimination mechanisms during 3D printing of metals
17. In situ X-ray imaging of pore formation mechanisms and dynamics in laser powder-blown directed energy deposition additive manufacturing10.1016/j.ijmachtools.2021.103743 ↗
18. Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging10.1126/science.aav4687 ↗
19. In-situ full-field mapping of melt flow dynamics in laser metal additive manufacturing
20. Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing10.1126/science.aay7830 ↗
21. In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing10.1038/s41467-018-03734-7 ↗
22. Operando X-ray diffraction during laser 3D printing10.1016/j.mattod.2019.10.001 ↗
23. The effect of powder oxidation on defect formation in laser additive manufacturing10.1016/j.actamat.2018.12.027 ↗
24. Grain refinement and columnar-to-equiaxed transition of Ti6Al4V during additive manufacturing via different laser oscillations10.1016/j.ijmachtools.2023.104031 ↗
25. Inhibiting weld cracking in high-strength aluminium alloys10.1038/s41467-022-33188-x ↗
26. In-situ characterization of pore formation dynamics in pulsed wave laser powder bed fusion10.3390/ma14112936 ↗
27. Pulsed-wave laser additive manufacturing of CrCoNi medium-entropy alloys with high strength and ductility10.1016/j.mattod.2024.10.004 ↗
28. Simulation-guided variable laser power design for melt pool depth control in directed energy deposition
29. TrackMate: an open and extensible platform for single-particle tracking10.1016/j.ymeth.2016.09.016 ↗
30. Chemical species mixing during direct energy deposition of bimetallic systems using titanium and dissimilar refractory metals for repair and biomedical applications
31. Additive manufacturability of superalloys : process-induced porosity, cooling rate and metal vapour
32. Melt pool temperature and cooling rates in laser powder bed fusion
33. In-situ experimental and high-fidelity modeling tools to advance understanding of metal additive manufacturing10.1016/j.ijmachtools.2023.104077 ↗
34. Dynamics of pore formation during laser powder bed fusion additive manufacturing10.1038/s41467-019-10009-2 ↗