| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functionally Graded Materials, Coatings and Claddings: Toward Microstructure and Property Control
|
| Presentation Title |
Functionally Graded Joints from Tungsten to Ferritic/Martensitic Steels Fabricated Using Laser-directed Energy Deposition |
| Author(s) |
Deniz Ebeperi, Tim Graening, Raiyan Seede, Austin Whitt, Ying Yang, Yutai Katoh, Ibrahim Karaman |
| On-Site Speaker (Planned) |
Deniz Ebeperi |
| Abstract Scope |
Joining dissimilar metals may promote performance and functionality. However, for systems like W to Steel joints, where there is no metallurgical compatibility, formation of deleterious phases prevents crack-free bonding. Use of filler alloys may lead to microstructure degradation at elevated temperatures, thus, not suitable for extreme environments. Coefficient of thermal expansion (CTE) mismatch between W and Steel gives rise to localized stresses during thermal cycling associated with processing and operation. Functionally grading along a well-designed compositional pathway, where the composition and CTE of successive layers are deliberately graded, reduction of thermal stresses and elimination of deleterious phase formation will produce more robust and durable joints. Here, we design interlayers between W and martensitic steel and fabricate compositionally graded porosity free joints between them using laser-directed energy deposition and multiple powder feeders. The microstructure and mechanical properties of these joints have been characterized. Important findings and remaining challenges will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, High-Temperature Materials |