About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
L-8: (S)TEM Characterization of Stability of Retained Austenite in Medium Mn Steel under Severe Deformation |
Author(s) |
Italo Oyarzabal |
On-Site Speaker (Planned) |
Italo Oyarzabal |
Abstract Scope |
Third-generation Advanced High Strength Steels (AHSS) have potential applications for the automotive industry, due to their balance between strength and ductility. Medium Mn steel microstructure consists of refined ferrite, retained austenite, and sometimes fresh martensite, obtained through intercritical annealing. Controlling the stability of the austenite phase during this thermal process is vital for the steel to show an efficient TRIP effect. Cold-rolled ferritic samples with composition 0.2C-4Mn-0.8Al-1.5Si were processed through different thermal treatments to provide the different medium Mn microstructures. Further, we use (Scanning) Transmission Electron Microscopy ((S)TEM) to investigate the austenite grain structure distribution, and Energy Dispersive Spectroscopy (EDS) was used to provide a chemical characterization of the partitioning element Mn between γ/α. With the results provided, it is possible to comprehend better the interplays between the different deformation mechanisms and the effect of local chemical gradients on austenite stability. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Phase Transformations |