| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Microstructural Control and Refinement in DMLS Ti-6Al-4V |
| Author(s) |
Matthew Vaughn, Justin Unger, Matthew Dunstan, Andrew Gaynor, Brandon Mcwilliams, James Guest, Kevin Hemker |
| On-Site Speaker (Planned) |
Matthew Vaughn |
| Abstract Scope |
Metal additive manufacturing (AM) processes often generate heterogeneous and undesirable microstructures due to their far-from-equilibrium quench rates. However, microstructural control in Ti-6Al-4V has previously been demonstrated using a hydrogen mediated heat treatment as a method to improve mechanical properties. Thermo-Hydrogen refinement of microstructure (THRM) has enabled homogenized microstructures at lower processing temperatures than traditional methods, through a hydrogenation process that lowers the β transus temperature. Here we present a systematic study of post-processing heat treatments to determine the effect on the microstructure. AM bars were fabricated using direct metal laser sintering and were grouped into different post-processing conditions, including common processes like HIP and aging treatments, then subjected to mechanical testing and microstructural characterization. Our findings revealed that the THRM process was able to tailor the microstructure and improve mechanical performance over standard AM Ti-6Al-4V post-treatments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Phase Transformations |