| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Mitigation of Solidification Cracking in Wire Arc Additive Manufacturing (WAAM) of Fe-based Shape Memory Alloy Using Machine Hammer Peening |
| Author(s) |
Soumyajit Koley, Kuladeep Rajamudili, Supriyo Ganguly |
| On-Site Speaker (Planned) |
Soumyajit Koley |
| Abstract Scope |
Wire-arc additive manufacturing (WAAM) of Fe-17Mn-10Cr-5Si-4Ni-0.5V-0.5C alloy was attempted using a cold-wire fed plasma arc torch. Multiple vertical cracks were observed after deposition. Microstructural characterization confirmed these cracks as solidification cracks. Machine hammer peening (MHP) process was adopted on each layer to cold work the newly deposited alloy. Effect of MHP traverse speed were varied systematically to attain a window of operation where cracking was completely stopped. MHP induced a compressive residual stress which countered the tensile residual stress evolved from solidification process. Significant local plastic deformation from MHP followed by the thermal cycle induced by deposition of next layer resulted into a recovered and recrystallized equiaxed microstructure instead of long columnar grains along the build direction. This microstructural change increased the total crack propagation length and thus the overall toughness. MHP significantly reduced the strong cubic {001} crystallographic texture and increases toughness. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |