| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
|
| Presentation Title |
Nonlinear Grading Approach for Ferritic P91 and Austenitic 347H Steels Joints Produced with Laser-Directed Energy Deposition Method |
| Author(s) |
Selda Nayir, Rangasaaye Kannan, Sebastien Dryepondt, Peeyush Nandwana |
| On-Site Speaker (Planned) |
Selda Nayir |
| Abstract Scope |
Blown powder Laser-Directed Energy Deposition (L-DED) provides a flexible design for joining dissimilar materials by varying the composition to reduce the sharp transition from one alloy system to another. The gradual mixing of dissimilar alloys with L-DED creates a smooth transition between dissimilar compositions, allowing controlled distribution of the coefficients of thermal expansion (CTE) properties within the transition zone. In this work, we adopted nonlinear compositional grading of P91 and Austenitic 347H steels with the aid of CALPHAD design. The results showed that the length of the transition region is controlled by reducing the carbon variation and CTE differences between the immediate graded layers. The pressurized creep test showed that the transition zone has the lowest tangential strain compared to P91 and 347H. The resulting creep strength of the graded joint at 50 MPa, under long-term exposure at 650°C, is comparable to the conventionally produced P91. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Joining, Other |