About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Late News Poster Session
|
| Presentation Title |
E-43: Multiscale Investigation of Early-Stage Boundary Sliding Mechanisms in Lath Martensite of Low-Carbon-Steel |
| Author(s) |
Shuang Gong, Junya Inoue |
| On-Site Speaker (Planned) |
Shuang Gong |
| Abstract Scope |
The anisotropic local deformation behavior of lath martensite complicates the understanding of its underlying plasticity mechanisms. In this study, a multiscale approach was employed to further advance the understanding of boundary sliding in low-carbon lath martensite. High-resolution digital image correlation (HR-DIC), molecular dynamics (MD) simulations, and electron channeling contrast imaging (ECCI) were integrated to investigate the boundary sliding process in the early stage of plastic deformation. Both macro-scale HR-DIC analysis and atomic MD simulation revealed that the sub-block and twin boundaries preferentially accommodate boundary sliding. Systematic shear simulations on twist boundaries representing various variant pairs clarified that the critical resolved shear stress (CRSS) for low-angle boundaries with dense hexagonal dislocation networks correlates with the ratio of <111> to <100> screw dislocation lengths within the network. Furthermore, simulations demonstrated that mobile “in-out” edge dislocations interact with these interfacial networks, facilitating misorientation changes that promote boundary sliding. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Iron and Steel, Modeling and Simulation, |