| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Integrated Mechanical Working Assisted Directed Energy Deposition Process: Improving Structural Integrity by Modifying Microstructure in Iron-Based Shape Memory Alloy |
| Author(s) |
Soumyajit Koley, Supriyo Ganguly |
| On-Site Speaker (Planned) |
Soumyajit Koley |
| Abstract Scope |
A wire-arc additive manufacturing (WAAM) process has been developed for Fe-based shape memory alloy where inter-layer cold working was introduced to modify the microstructure of the deposit favourably. This was achieved by peening (MHP) each deposited layer in cold conditions (100°C) using a pneumatically controlled machine hammer. The peening process was optimised, and the peening line energy was correlated to strain generated, average grain size, the fraction of low and high-angle grain boundaries, coincidence site lattice (CSL) boundaries and texture components. The study indicates that the microstructure recovered, and a complete reformation of the microstructure took place in peened specimens. This reduced the grain size from a few mm to 15 μm while increasing the volume fraction of Σ3 and Σ9 boundaries from 0 to 60% and 6% respectively as the peening line energy increased from 0 to 43 J/mm. This mitigated hot cracking issue and improved mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Other |