| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Use of Large Scale Facilities to Understand the Physical Metallurgy of Fe-based Alloys
|
| Presentation Title |
Microstructure Evolution and Phase Transformations during Deformation of Metastable Austenitic CrMnNi Steel as Revealed by In situ Synchrotron Radiation X-ray Diffraction |
| Author(s) |
Christiane Ullrich, Stefan Martin, Christian Schimpf, Andreas Stark, Norbert Schell, David Rafaja |
| On-Site Speaker (Planned) |
Christiane Ullrich |
| Abstract Scope |
In situ X-ray diffraction experiments using synchrotron radiation were performed during uniaxial compression at varying temperatures in order to explore the deformation mechanisms occurring in an austenitic 16Cr-7Mn-3Ni TRIP/TWIP steel. The 2D diffraction data collected in transmission geometry revealed the phase composition, residual lattice stress, microstrain caused by dislocations, stacking fault probability and preferred orientation of crystallites in individual deformation steps. These microstructure characteristics were utilized to describe the microstructure evolution of the TRIP/TWIP steel during the plastic deformation. The main deformation mechanisms, which are the formation of dislocations and stacking faults in austenite, and the transformation of austenite to epsilon- and alphaŽ-martensites, were quantified as functions of the external load and temperature. Based on these results, a model describing the contributions of individual deformation mechanisms to the plastic deformation of the steel as a function of the temperature-dependent stacking fault energy was formulated. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |