About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Determining Grain Size and Hardness in Laser Powder Bed Fusion Materials from Simulated Cooling Rates via Thermal Process Simulation |
Author(s) |
David Scott Anderson, Kevin N. Renteria, Jorge Mireles, Albert C. To, Ryan B. Wicker |
On-Site Speaker (Planned) |
David Scott Anderson |
Abstract Scope |
Achieving consistent microstructural properties of parts manufactured in laser powder bed fusion additive manufacturing processes remains a significant hurdle for process qualification in sensitive applications such as aerospace and nuclear industries. In this work, a means of predicting grain cell size and local microhardness based on part-scale simulations is presented. First, a stepped brick geometry is designed and utilized to evaluate microhardness and grain cell size at different degrees of residual heat accumulation, represented as a layerwise preheat temperature value. Then layerwise and local scanwise simulation models are built through a GPU-accelerated finite element method (FEM) based process simulation tool capable of efficient part-scale scanwise simulation. From these simulations, the local cooling rate near the melt pool is calculated, and a relationship with experimentally-determined microhardness and grain cell size is determined. The relationship is validated on an unseen geometry. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |