About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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Presentation Title |
In Situ 3D Characterization and Crystal Plasticity Modeling of Martensite Formation in Austenitic Steels
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Author(s) |
Todd C. Hufnagel, Ye Tian |
On-Site Speaker (Planned) |
Ye Tian |
Abstract Scope |
The martensitic transformation under mechanical loading can have an important effect on plastic deformation of austenitic steels and is expected to be sensitive to microstructure in polycrystalline alloys, and in particular on the local grain orientations and grain boundary character. In this talk, we will describe the use of high-energy diffraction microscopy to track microstructure evolution in situ during uniaxial tensile loading of austenitic Fe-Cr-Ni alloys. The first martensite we observe is the hcp epsilon phase, and as the strain increases we observe formation of the bcc alpha-prime phase in close proximity to the previously-formed epsilon martensite. We used the HEDM data to validate a crystal plasticity model that accounts for dislocation slip as well as deformation-induced formation of both martensite phases, including the effect of dilatation due to the transformation, and used this model to investigate the effect of microstructure on the transformation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Iron and Steel, Phase Transformations |