| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Phase Transformations in Additively Manufactured Materials
|
| Presentation Title |
Understanding the Effect of Thermal Gradients on Additively Manufactured (AM) Builds Using In Situ TEM |
| Author(s) |
Sriram Vijayan, Meiyue Shao, Joerg Jinschek |
| On-Site Speaker (Planned) |
Sriram Vijayan |
| Abstract Scope |
Complex additive manufacturing (AM) process conditions typically result in parts with anisotropic microstructures and sub-optimal mechanical performance. The cyclic deposition of new layers using electron beam powder bed fusion (EB PBF) exposes ‘previously deposited’ layers to directional reheating, large thermal gradients and rapid cooling rates. Previous studies of solid-solid phase transformations in Ti-6Al-4V (Ti64) have aided in optimizing processing routes to yield Ti64 with desirable mechanical properties. However, such transformations in Ti64 under AM process conditions are not yet well understood. Here, we use a micro-heater device to simulate AM-like process conditions (106 K/m and 103K/s) across a Ti64 sample inside the transmission electron microscope (TEM). In this study, heating experiments were performed to identify whether V diffusion is the governing process in the α’ → β → α’ + β transformation under large thermal gradients and rapid thermal cycling in Ti64 inside the TEM at high spatial resolution |