About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron and X-ray Scattering in Materials Science
|
| Presentation Title |
Operando Neutron Diffraction Reveals Insights into Transient Phases and Residual Stresses during Directed Energy Deposition Additive Manufacturing |
| Author(s) |
Chris Fancher, Kyle Saleeby, Ke An, James Haley, Guru Madireddy, Thomas Feldhausen, Yousub Lee, Dunji Yu, Clay Leach, Alex Plotkowski |
| On-Site Speaker (Planned) |
Chris Fancher |
| Abstract Scope |
Additive Manufacturing (AM), often called 3D printing, offers the unique opportunity to transform how materials are consolidated into bulk 3D structures. The localized melt strategies in metal AM introduce non-equilibrium thermal conditions that can affect the microstructure and phase evolution in as-fabricated parts. ORNL has developed an AM sample environment to study transient phases and bulk stress evolution during metal DED using the engineering diffractometer VULCAN-X at the Spallation Neutron Source. This paper will present the system's system capabilities by capturing the phase evolution during deposition of low-temperature transition and mild steels in operando. Differences in the temperature dependences of phase transitions significantly impact as-fabricated residual strains and stresses. Measured operando diffraction data provide critical information needed for material model validation mechanics, including the use of diffraction data as a bulk temperature probe. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |