About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Cavity-induced bubbles and pore formation of laser direct energy deposited titanium alloy: influence of powder melting degree |
| Author(s) |
Chen Mingyuan, Zhang Jikui |
| On-Site Speaker (Planned) |
Chen Mingyuan |
| Abstract Scope |
Porosity defects have become one of the key issues in the widespread application of laser direct energy deposited titanium alloy components. The present work focuses on the cavity evolution and bubble generation process of unmelted, partially melted and fully melted powder entering the melt pool. An equivalent experiment, ice particle with different melting degree impact water, was designed and conducted on the basis of similarity criterion in fluid mechanics. Then, a numerical model of powder impingement melt pool was established to simulate the evolution of cavity with different melting degree. Finally, a deposition processing with different melting states of the powder was engaged to verify the influence of the melting states of the powder on the pore formation. The results show that with the increase of melting degree of powder, the collapse of cavity changes from the pinch-off to contraction mode, which avoids the generation of cavity-induced bubbles. |