About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
Numerical Analysis of Pre- and Post-Heating Strategies for Reducing Residual Stresses in Laser-Based Directed Energy Deposition |
Author(s) |
Usman Tariq, Sung-Heng Wu, Muhammad Arif Mahmood, Frank Liou |
On-Site Speaker (Planned) |
Muhammad Arif Mahmood |
Abstract Scope |
This research explores how pre- and post-heating methods influence temperature gradients and residual stresses in Ti-6Al-4V components produced via Laser Directed Energy Deposition (DED). Using numerical simulations complemented by experimental validation, the study assesses two heating intensities—40% (low) and 80% (high)—relative to the main deposition laser power. Results demonstrate that preheating substantially decreases thermal gradients, thereby effectively reducing residual stresses within the deposited structure. Conversely, post-heating exhibited only minor changes in local temperature fields, with comparatively limited effects on overall stress mitigation. These outcomes underline that managing initial thermal conditions through preheating strategies is critical for effectively controlling residual stresses in additive manufacturing processes. The study provides insights into optimizing thermal management protocols to enhance the mechanical integrity of laser-based DED components. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |