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 |
CW Laser-SEM: A novel continuous-wave laser and SEM coupling |
| Author(s) |
Manas V. Upadhyay, Alexandre Tanguy, Juan Guillermo Santos Macías |
| On-Site Speaker (Planned) |
Manas V. Upadhyay |
| Abstract Scope |
A novel coupling between a continuous-wave (CW) laser and a scanning electron microscope (SEM)–CW Laser-SEM–has been developed [1,2]. It enables laser processing under additive manufacturing (AM)-relevant conditions (24–200 W, 0.1–20000 mm/s, 45–500 μm spot size) within a controlled (high-vacuum or inert-gas) environment, eliminating oxidation and allowing SEM-based pre- and post-laser characterization at identical locations without mechanical polishing. Single-pass lasering experiments on 316L stainless steel were used to validate simulations involving CFD, solidification and intergranular stress and plastic deformation evolution driven by transient thermal gradients. Post-process high-vacuum lasering of AM 316L was performed to induce near-surface intragranular defect refinement and reduce surface roughness, leading to significant enhancements in strength (31%), ductility (14%), and fatigue limit (25%). The CW Laser-SEM is thus a versatile platform for AM emulation, laser-induced deformation quantification, microstructure re-engineering and property enhancement.
[1] Publication: Materials & Design https://doi.org/10.1016/j.matdes.2025.114064
[2] Patent applied: 16-Dec-2022 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Characterization |