| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
|
| Presentation Title |
A-11: In-situ Detection and Ex-situ Characterization of Porosity in Laser Powder-bed Fusion (LPBF) |
| Author(s) |
Nismath Valiyakath Vadakkan Habeeb, Kevin Chou |
| On-Site Speaker (Planned) |
Nismath Valiyakath Vadakkan Habeeb |
| Abstract Scope |
Melt pool instability under constantly changing physical phenomena, such as the recoil pressure, causes porosity defects in LPBF parts, deteriorating their structures and mechanical properties. Hence, an efficient closed-loop control strategy for adjusting process parameters in-situ is desired in LPBF. High frequency melt-pool signatures during laser scanning are plausibly key factors, which reflect the instantaneous state of a melt pool as well as the surrounding scanning area. However, the lack of confidence in monitoring melt-pool signatures is one of major reasons why melt pool controls are of an utmost challenge. This study aims to develop a correlation between melt pool variations during LPBF processing and porosity in LPBF parts. Melt pool dimensions were monitored using a near-infrared thermal imager during the LPBF fabrication of Ti6Al4V specimens with varied process parameters. Ex-situ characterization of porosity in the specimens was performed using a micro-CT scanner and the results were analyzed for correlations. |