About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
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| Presentation Title |
G-7: Study on Microscale Strain Localization and Slip Activity in Ferritic AISI 420 Steel Via Digital Image Correlation and Crystal Plasticity Modeling |
| Author(s) |
Yadong Zhou, Kegu Lu, Redmer van Tijum, Maysam Naghinejad, Yutao Pei, Jan Post |
| On-Site Speaker (Planned) |
Yadong Zhou |
| Abstract Scope |
This work investigates microscale strain localization and slip activity in ferritic AISI 420 stainless steel using scanning electron microscopy-based digital image correlation (SEM-DIC), electron backscatter diffraction (EBSD), and crystal plasticity (CP) modeling. The microstructure, consisting of ferritic grains with finely dispersed carbides, exhibits early strain localization that intensifies under increasing global strain. Statistical analyses indicate that localized deformation does not arise from any single microstructural parameter, but rather from the combined influence of multiple constraints. Specifically, poor geometrical alignment of slip transfer at misaligned grain boundaries, restricted slip paths between ferrite grain boundaries and carbides, and limited deformation accommodation in smaller grains collectively promote strain localization. To further analyze slip transfer conditions, a accumulated-shear methodology is introduced to identify the dominant slip systems by integrating the loading history from multi-step DIC measurements. Additionally, a CP model based on the DIC-ROI microstructure reveals local stress heterogeneities at the microscale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Mechanical Properties |