About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Functional and Energy Materials
|
Presentation Title |
Development of an Austenitic/Martensitic Gradient Steel by Additive Manufacturing |
Author(s) |
Flore Villaret, Xavier Boulnat, Pascal Aubry, Damien Fabrègue, Yann de Carlan |
On-Site Speaker (Planned) |
Flore Villaret |
Abstract Scope |
In this study, we focused on a gradient from a 316L austenitic stainless steel to a 9Cr-1Mo martensitic steel. These steels are widely used for nuclear applications. Due to their chemical composition differences, welding them is uneasy, requiring nickel based filling metal and post-welding heat treatments.
It is possible to consider the construction of a coupling sleeve between 316L and 9Cr-1Mo by additive manufacturing. Direct Metal Deposition (DMD) technique allows to gradually change the chemical composition from 316L to 9Cr-1Mo, allowing homogeneous welding at each end and thus simplifying the assembly step.
Additive manufactured graded samples were built without major defects. Microstructural study of the transition by SEM/EBSD shows very good metallurgical bonding with a smooth transition from the 316L austenite to the 9Cr-1Mo martensite. Tensile tests shows that bonding in graded part is strong. Thermodynamic calculation and thermal cycle modelling are used to explain the observed microstructures. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |