About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Developments in Advanced Nuclear Structural Materials
|
| Presentation Title |
Creep Performance and Characterization of In-Situ Tempering on Wire Arc Additively Manufactured (WAAM) Grade 91 Steel for Nuclear Applications |
| Author(s) |
Daniel Codd, Joseph McCrink, Stephen Taller, Caitlin Duggan, Yanl Wang |
| On-Site Speaker (Planned) |
Daniel Codd |
| Abstract Scope |
Grade 91, a modified 9Cr-1Mo ferritic/martensitic steel with high temperature strength and creep resistance, is attractive for power generation applications. It is ASME Section III-Div 5 qualified for next-generation nuclear reactors and exhibits relatively low irradiation swelling and liquid metal coolant corrosion. Wire Arc Additive Manufacturing (WAAM) using Grade 91 can offer increased design flexibility in new and repair work; however, preheat, interpass control and post processing heat treatments are needed to mitigate brittleness, cracking and restore high temperature performance. Here we characterize conventional WAAM Grade 91 alongside WAAM with integrated in-situ tempering, accomplished using a post deposition induction secondary heat source to develop the desired tempered martensitic microstructure. Microhardness distributions, mechanical and creep performance are compared for various process conditions, and hardware design is presented for integration into ORNL’s MedUSA coordinated multi-robot WAAM at the Manufacturing Demonstration Facility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, Mechanical Properties |