| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Large-scale Metallic Components
|
| Presentation Title |
Operando Neutron Diffraction Characterization of Wire-Arc Deposited Steels |
| Author(s) |
Alex J. Plotkowski, Kyle Saleeby, Chris Fancher, James Haley, Ke An, Guru Madireddy, Yousub Lee, Tom Feldhausen, Dunji Yu, Clay Leach |
| On-Site Speaker (Planned) |
Alex J. Plotkowski |
| Abstract Scope |
A wire-arc directed energy deposition system was designed and constructed to enable operando characterization by neutron diffraction at ORNL’s Spallation Neutron Source. The system, called OpeN-AM, was used to fabricate components made of both mild and low-temperature transformation steels. Time-resolved neutron diffraction measurements were used to characterize phase changes during processing. At specific points during processing, neutron diffraction maps were also collected across the samples to characterize the lattice strain distributions. These measurements revealed the relationships between process dynamics and residual stress development, particular in relationship to the volume expansion during the austenite to martensite transformation in the LTT steel. These observations were also correlated with infrared data and computational modeling results. Results indicate the ability to control residual stress patterns through manipulations of the interaction between AM process dynamics and key material phase transformations, creating an opportunity for controlled residual stress states in manufactured components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Phase Transformations |