| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Multi-Scale Analysis of Lath Boundary Sliding during Plastic Deformation of Lath Martensite In Low-Carbon-Steel |
| Author(s) |
Shuang Gong, Junya Inoue |
| On-Site Speaker (Planned) |
Shuang Gong |
| Abstract Scope |
The specific anisotropic deformation behavior of slip along the lath grain boundaries poses challenges in understanding the deformation mechanism of lath martensite. This study investigates the dislocation dynamics underlying grain boundary sliding in low-carbon steel lath martensite, employing a novel combination of in-situ tensile Electron Channeling Contrast Imaging (ECCI) and Digital Image correlation (DIC).
This study establishes that the lath interface strongly influences the notable local anisotropy of deformation in lath martensite. To determine how the lath boundary affects dislocation activity, microscopic ECCI observations directly track the behavior of dislocation structures and successfully capture the boundary sliding at specific interfaces. Work hardening, induced by dislocation activity within the lath, leads to boundary sliding becoming the predominant mode of plastic deformation. This analysis also identifies the critical resolved shear stress required for boundary sliding. Meanwhile, the DIC technique reveals the local deformation at the strain level, validating the microscopic observations. |