| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
Laser Influences on Heterogeneity in Powder Bed Fusion Aluminum with Reactive Additions Studied by X-ray Microtomography |
| Author(s) |
Daniel R. Sinclair, Nikhilesh Chawla |
| On-Site Speaker (Planned) |
Daniel R. Sinclair |
| Abstract Scope |
Significant interest in the production of aerospace parts by laser powder bed fusion (LPBF) has led to the modification of age hardened aluminum alloys to improve printability. The reactive additive manufacturing (RAM) process refines alloys by forming inoculant particles in the powder bed, preventing cracking and improving performance. In order to obtain additively processed materials with microstructural homogeneity, the influences of laser parameters and reactive additives on melt pool dynamics, solidification, and defect formation need to be understood. In this work, x-ray microscopy was used to visualize and quantify the effects of scan speed and sample size on microstructural heterogeneity in thin walls of AA7050-RAM2. Distributions and morphologies of RAM particles and pores were correlated to local grain structure and mechanical behavior. These observations lead to a novel understanding of convection and solidification and can be used to optimize scan parameters for improved part density, build rate, and surface roughness. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Characterization |