| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development VI – Closed-Loop Alloy Design
|
| Presentation Title |
Fine-grained and Texture-free Microstructure of AISI 304L Steel Obtained by Alloy Adjustment for Electron Beam Additive Manufacturing Process |
| Author(s) |
Christina Burkhardt, Anja Weidner, Marco Wendler, Olena Volkova, Horst Biermann |
| On-Site Speaker (Planned) |
Anja Weidner |
| Abstract Scope |
Powder-bed based processing of austenitic stainless steels often results in a columnar microstructure with strong texture caused by the high temperature gradient. The resulting anisotropic mechanical properties are undesirable for the majority of applications. The present study shows the transition from columnar to fine-grained and texture-free microstructure of austenitic stainless steel AISI 304L via electron-beam powder-bed fusion (EB-PBF) by alloy adjustment. The resulting material properties are discussed on the base of the solidification behaviour by means of thermodynamic calculations as well as microstructural investigations and are compared with 304L steel in its standard composition. Tensile tests carried out parallel and perpendicular to build direction revealed an ultimate tensile strength up to 715 MPa and a total elongation up to 70 %. Under monotonic loading, the steel modifications exhibited a high damage tolerance against process-induced defects due to the TRIP (TRansformation Induced Plasticity) effect. |
| Proceedings Inclusion? |
Planned: |