| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Understanding the Influence of Thermal Gyrations on Solid-solid Interfaces in Ti-6Al-4V during EBM PBF Process Using In Situ TEM |
| Author(s) |
Sriram Vijayan, Meiyue Shao, Joerg Jinschek |
| On-Site Speaker (Planned) |
Sriram Vijayan |
| Abstract Scope |
In powder bed fusion (PBF) processes, additively manufactured (AM) Ti-6Al-4V (Ti64) builds experience extreme thermal gyrations (103-105 K/m & 103 K/s) during electron beam melting (EBM) of Ti64 powder. Using the default ‘raster scan’ EBM strategy, thermal gyrations experienced by the melt pool and previously deposited layers result in significant variations in microstructure across the build. Recently, researchers have revealed that modified EBM beam scanning strategies allow the control of thermal gradients and cooling rate, thereby controlling the local microstructure within an AM part. Here, we present an in situ TEM heating study, using a modified micro-heater to simulate AM like process conditions, to understand the influence of thermal gyrations across a solid-solid Ti64 interface at high spatial resolution. Subsequently, ex situ and calorimetric experiments were performed, to validate our in situ results and understand the mechanisms of solid-state processes and interface stability in builds during the non-equilibrium AM process. |
| Proceedings Inclusion? |
Planned: |