About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Dislocation Analysis in Fatigue Tested AISI 316L Stainless Steel |
Author(s) |
Johan E. Westraadt |
On-Site Speaker (Planned) |
Johan E. Westraadt |
Abstract Scope |
Localized cyclic plastic deformation and subsequent crack initiation are considered the dominant life-controlling mechanisms in high-cycle fatigue of metals. Cross correlation electron backscattered diffraction (CC-EBSD) and electron channeling contrast imaging (ECCI) are techniques that are used to study dislocation structures because they offer a larger field of view and simplified sample preparation compared to transmission electron microscopy methods. However, ECCI require specific grain orientations to observe dislocations, making it a time-consuming method for polycrystalline materials. In this study, we investigate a fatigue tested AISI 316L sample using a “flat-geometry” EBSD detector, which facilitates combined ECCI and EBSD data collection without the need to tilt the sample. The stored Kikuchi patterns are analyzed using CC-EBSD to determine the geometrically necessary dislocations (GNDs). We also evaluate the use of virtual backscattered electron (BSE) imaging to map out dislocation structures at specific diffraction conditions and compare these to traditional ECCI. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Other |