About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
|
6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Searching for Life-limiting Localized Deformation in Inconel-718 using In-situ Cyclic Loading and High Energy X-rays |
Author(s) |
Dalton Shadle, Kelly E. Nygren, Matthew Miller |
On-Site Speaker (Planned) |
Dalton Shadle |
Abstract Scope |
To understand complex phenomena such as fatigue crack initiation in a ductile polycrystal, ideally, we would probe everywhere, all the time. Unfortunately, there is a trade-off between temporal and spatial resolution in 3D experimental techniques. Characterizations which prioritize temporal resolution must sacrifice the spatial resolution or dimensionality of data and can lose direct access to important microstructural features tied to mechanisms of interest. In this work, we employ spatially-resolved electron characterization techniques to inform time-resolved high-energy X-ray diffraction microscopy (HEDM) characterizations to identify grains exhibiting localized-deformation inside (Gremlins) through a signature of localized-deformation in an Inconel-718 sample subjected to fully reversed cyclic loading. We construct this signature by correlating the shape of single grain orientation distributions with high gradients of localized-deformation within a grain. With this signature, we focus on the evolution of stress and orientation of individual Gremlins to understand the potential for fatigue crack initiation within the material. |
Proceedings Inclusion? |
Definite: Other |