About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
Enabling Spatial Property Gradients in Additive Manufacturing via Controlled Rescanning |
Author(s) |
Bharath Bhushan Ravichander, Kalyan Nandigama, Golden Kumar |
On-Site Speaker (Planned) |
Golden Kumar |
Abstract Scope |
Additive manufacturing (AM) has become a robust method for producing net-shaped metal components layer by layer, offering exceptional design flexibility for advanced engineering applications. In laser powder bed fusion (L-PBF), steep thermal gradients and rapid solidification rates strongly influence the formation of site-specific material properties. This study presents a lattice-based selective rescanning strategy to modify solidification conditions in IN718 alloy components locally. We demonstrate a significant increase in primary dendritic arm spacing (PDAS) compared to reference samples fabricated without rescanning by applying a secondary laser pass in targeted regions. Microstructural characterization reveals a corresponding rise in total dislocation density, while mechanical testing shows distinct variations in microhardness across the selectively processed areas. These results highlight selective rescanning as an effective method to engineer heterogeneous microstructures and mechanical properties within a single build, advancing the capabilities of L-PBF for location-specific performance optimization. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |