About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
K-19: Understanding the Deformation Mechanisms and Phase Transformations in High Alloy Metastable Austenitic Steels |
Author(s) |
Stefan Martin, Christiane Ullrich, Mykhaylo Motylenko, David Rafaja |
On-Site Speaker (Planned) |
Stefan Martin |
Abstract Scope |
High alloy austenitic CrMnNi steels undergo different deformation mechanisms as a function of chemical composition, strain rate, stress state and deformation temperature. These kind of iron-based alloys are advanced high strength steels, as new interfaces in the austenite grains are created by deformation twinning and martensitic transformations (ε- and α’-martensite) during plastic deformation, bringing about additional strengthening. Due to the chemically tunable low stacking fault energy of the fcc austenite, dislocation glide behavior is remarkably influenced, which provokes increased stacking fault formation. Stacking fault clusters are the nucleation site for the martensitic transformation and the deformation twinning. Using a combination of electron microscopy, electron backscattered diffraction and X-ray diffraction, the peculiarities of the deformation mechanisms and phase transformations and their interconnection is revealed. Through these insights, microstructure parameters can be identified entailing adequate modelling approaches of the mechanical behavior. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |