| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-89: Banded Heat Affected Zone (HAZ) and Post Build Ageing Microstructure Interactions in LBP-DED IN718 |
| Author(s) |
Ioannis Bellos, Ed Pickering, Chris Heason, Philip Prangnell |
| On-Site Speaker (Planned) |
Ioannis Bellos |
| Abstract Scope |
Banded microstructures arise in Laser Blown Powder Directed Energy Deposition (LBP-DED) manufactured materials associated with re-melting and overlapping of Heat Affected Zones (HAZ) during each deposition pass. In addition, due to limitations imposed by the intended application of many components, full solution treatments cannot always be used. The purpose of this research was to understand the formation of banded microstructures in LBP-DED IN718 samples, in terms of their relationship to the local chemistry and response to subsequent post-build direct ageing treatments. To this end, spatially correlated multi-scale microstructure, compositional, and phase analysis has been performed using EPMA, HR-SEM, and (S)TEM, facilitated by location specific FIB specimens. A complex precipitation sequence was observed across a dendrite as it interacted with a HAZ and responded to ageing, with the precipitate type and morphology being dictated by the original local compositional gradients that existed within the material, as a result of the deposition. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |