About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Additive Manufacturing: Advanced Characterization With Synchrotron, Neutron, and In Situ Laboratory-scale Techniques IV
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| Presentation Title |
Estimating elastic and thermal contributions to lattice strains from operando X-ray diffraction measurements using fast simulations |
| Author(s) |
Steve Gaudez, Daniel Weisz-Patrault, Kouider Abdellah Abdesselam, Hakim Gharbi, Veijo Honkimäki, Steven Van Petegem, Manas V. Upadhyay |
| On-Site Speaker (Planned) |
Manas V. Upadhyay |
| Abstract Scope |
Lattice strains measured via operando synchrotron X-ray diffraction during metal additive manufacturing are often used to estimate temperature evolution. Traditional approaches assume elastic strains are negligible near the heat source at high temperatures, leading to potential errors in both temperature and stress predictions, especially as the heat source moves away. This work presents an experimentally corrected numerical approach to improve strain-based temperature and stress estimation. A recently developed fast thermomechanical model first predicts thermal and elastic strains. These are then corrected through a constrained minimization procedure ensuring that predicted lattice strains match experimental ones. This approach is demonstrated for directed energy deposition of 316L stainless steel. The corrected results enable improved estimation of temperature and stress evolution. The study further quantifies the differences in predicted temperature and heating/cooling rates when elastic strain contributions are neglected, highlighting the importance of accounting for elastic effects in operando measurements. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Characterization |