About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
HR-EBSD Characterization of Subgrains in an Interstitial-free Steel Following High-temperature Deformation |
Author(s) |
Thomas J. Bennett, Eric M Taleff |
On-Site Speaker (Planned) |
Thomas J. Bennett |
Abstract Scope |
High-resolution electron backscatter diffraction (HR-EBSD) was applied to measure the sizes and boundary misorientations of subgrains produced by high-temperature deformation of a titanium-added interstitial-free steel. Subgrain boundaries produced in pure metals and Class II (Class M) alloys during high-temperature deformation exhibit misorientation angles as small as 0.1°, which is too small to reliably measure with conventional EBSD. HR-EBSD provides a new method for characterizing these important microstructural features. Microstructures containing subgrains were created during tensile deformation at 850 °C and preserved by quenching while applying a constant stress. HR-EBSD data were acquired to identify subgrains and measure distributions of subgrain boundary misorientations, which are approximately log-normal. Subgrain boundary misorientations increase with strain. Subgrain size remains constant with increasing strain, but grain size increases significantly. Complementary data from backscattered electron imaging suggest that subgrains accelerate dynamic normal grain growth during high-temperature deformation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, High-Temperature Materials |