About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
A-21: Laser Powder Bed Fusion of 17-4 PH Stainless Steel: Multiscale Microstructure and Property Relationships |
Author(s) |
Maxwell Moyle, Nima Haghdadi, Xioazhou Liao, Simon Ringer, Sophie Primig |
On-Site Speaker (Planned) |
Maxwell Moyle |
Abstract Scope |
Processing by many additive manufacturing (AM) techniques generally exposes alloys to vastly different conditions than those usually experienced during conventional subtractive processing routes, such as sharp thermal gradients, high solidification rates, and numerous reheating cycles. This results in distinct microstructural features including hierarchical and anisotropic grain structures as well as metastable phases. These features in turn have a knock-on effect on mechanical properties, for reasons including residual stress and transformation toughening. The current work reveals these phenomena occurring in 17-4 PH stainless steel produced by laser powder bed fusion, highlighting differences in microstructural behaviour both in the as printed state as well as after heat treatments. Correlative investigations of these effects were undertaken using a broad range of techniques including neutron scattering, electron backscattered diffraction, and atom probe microscopy. This allowed for a multiscale evaluation of the AM builds in terms of residual stress, texture, phase, and nanoscale precipitation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, |