About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing for Energy Applications V
|
Presentation Title |
CALPHAD-based Design of Graded Transition Joints |
Author(s) |
Peeyush Nandwana, Rangasayee Kannan, Thomas Feldhausen, Kyle Saleeby, Yousub Lee, Andres Rossy, Christopher Fancher, Brian Jordan |
On-Site Speaker (Planned) |
Peeyush Nandwana |
Abstract Scope |
Austenitic and ferritic steels are two critical classes of steels with unique properties and costs that make them suitable for niche applications. As the energy sector pushes for higher efficiency and focuses on a hydrogen-based economy, it is imperative that these two steels will need to be joined to satisfy the varied requirements within a complex component. The difference in the coefficient of thermal expansion (CTE) and carbon chemical potential between the two steels often results in early failure at the joint. Here, we demonstrate the use of CALPHAD calculations to design a graded transition joint between Grade 91 steel and 347H stainless steel. The graded transition joint was fabricated using blown powder directed energy deposition and characterized. We show that the non-linear composition change in the transition zone results in a lower stress and carbon chemical potential compared to a linear transition joint. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Phase Transformations |