About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
In-situ X-Ray Diffraction Investigation of High-strain Rate, High-temperature Deformation in Microalloyed Steel |
Author(s) |
Tim Wigger, Rosa Pineda, Simon A. Hunt, Danielle M. Fenech, Ben Thomas, Thomas Kwok, David Dye, Gorka Plata, Jokin Lozares, Inaki Hurtado, Stefan Michalik, Michael Preuss, Mohammed Azeem, Peter D. Lee |
On-Site Speaker (Planned) |
Tim Wigger |
Abstract Scope |
A novel high-strain rate, high-temperature steel forging process has been developed, substantially reducing material use and processing steps compared with conventional forging or semi-solid forming. This study aims to uncover the micro-mechanical and microstructural evolution during the process at T=1300°C and ἐ=10s-1, which to date is poorly understood. The rapid transient, non-equilibrium transformations were captured in-situ by angle-dispersive high-energy X-ray powder diffraction with high time resolution. The microstructural evolution in different steel grades was examined, revealing that the deformation process involves grain rotation, nucleation and refinement due to the formation of small- and large-angle grain boundaries. A steady-state phase in stress and strain indicates a temporary balance between work hardening and recovery processes, enabling high ductility by dynamic recovery and dynamic recrystallisation. These results improve our understanding of high-temperature, high-strain rate deformation processes in materials with FCC crystal structure, supporting the development of constitutive models for more efficient manufacturing routes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Shaping and Forming, Mechanical Properties |