| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Rationalization of the Solidification Behavior in Additively Manufactured PH Steels Using In-situ Radiography, Ex-situ Orientation Image Microscopy and Thermodynamic Modelling |
| Author(s) |
Rakesh R. Kamath, Logan White, Serena Beauchamp, Kamel Fezzaa, Eric Lass, Hahn Choo |
| On-Site Speaker (Planned) |
Rakesh R. Kamath |
| Abstract Scope |
In this study, a laser-AM simulator (at beamline 32-ID-B, APS) in tandem with in-situ dynamic x-ray radiography was used to investigate the effect of alloy composition on solidification microstructure in additively manufactured PH steels using conduction-mode spot melts on 17Cr-4Ni (17-4) and 15Cr-5Ni (15-5) steels. Radiography measurements showed that melting and solidification kinetics were similar for both alloys, however, it was seen that 17-4 had faster initiation and slower kinetics compared to 15-5 during solidification. Ex-situ SEM-EBSD characterization showed a fully ferritic microstructure with larger grains (~ 20 micrometers) in the 17-4 and a mostly ferritic microstructure (> 90%) with small grains (~ 5 micrometers) in the 15-5. A parent reconstruction of 15-5 resulted in full austenitic microstructure implying a primary gamma-solidification mode, in contrast with 17-4 which showed a primary delta-solidification mode. Furthermore, the experimental findings were compared to thermodynamic and kinetic modelling results obtained using the CALPHAD approach. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Iron and Steel |