About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing for Energy Industry
|
| Presentation Title |
High-Temperature Mechanical Performance and Radiation Stability of Heat-Treated LP-DED Alloy A709 |
| Author(s) |
Subhashish Meher, Jens Darsell, Jon Lapeyre, Francelia Sanchez, Isabella van Rooyen |
| On-Site Speaker (Planned) |
Subhashish Meher |
| Abstract Scope |
A709 is an advanced austenitic stainless-steel candidate for sodium fast reactor structural components. This work evaluates the high-temperature tensile, creep, and ex-situ ion irradiation response of laser powder directed energy deposition (LP-DED) A709 after solution annealing, precipitation treatment, and combined solution annealing plus precipitation treatment. Tensile testing at room temperature and 550°C shows that the combined treatment provides a favorable strength–ductility balance through precipitation strengthening. Creep testing at 650°C and 750°C demonstrates creep resistance comparable to wrought A709, with reduced creep rates linked to refined cellular solidification boundaries and stable nanoscale precipitates. Atom probe tomography identifies M₂₃C₆ and MX-type carbonitrides preferentially associated with DED cell boundaries, forming a hierarchical strengthening structure. Ex-situ ion irradiation measurements assess radiation-induced microstructural evolution and precipitate stability, supporting qualification of LP-DED A709 for advanced reactor applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Nuclear Materials |