| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Microstructural Evolution and Material Properties Due to Manufacturing Processes: A Symposium in Honor of Anthony Rollett
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| Presentation Title |
Effect of Annealing Temperature on Microstructure and Mechanical Properties of Al Added Medium Mn Steel |
| Author(s) |
Mukesh Kumar Yadav, Deepak Kumar, Navanit Kumar, Tapas Kumar Bandyopadhyay |
| On-Site Speaker (Planned) |
Mukesh Kumar Yadav |
| Abstract Scope |
In this work, the Al (~3 wt%) added medium Mn steel has been developed by melting-casting route in an induction furnance. The cast ingot has been hot forged to 50% thickness reduction in temperature range of 1100-800℃ and subsequently air cooled to room temperature. Further it has been hot rolled to ~75% thickness reduction in temperature range of 1100-800℃ and subsequently water cooled to room temperature. Finally, the hot rolled sample has been intercritical annealed at different annealing temperature of 720℃, 750℃ and 800℃ for 1 hr and then cooled in still air to room temperature. The phase fraction of specimen during after thermomechanical processing has been analyzed by rietveld refinement using X-ray diffraction data. The microstructure characterization has been done by using optical microscopy, scanning electron microscopy, electron back scattered diffraction and transmission electron microscopy. The microstructural analysis shows the formation of multiphase microstructure that consist elongated ferrite and interlamellar structure of martensite + austenite during hot deformation (hot forging and hot rolling) as well as annealed condition. This is due to the addition of ferrite and austenite stabilizing elements (Al, Mn) in the alloys. However, Xrd analysis reveal that the austenite fraction in intercritical annealed sample has significantly increased compare to hot forging and rolling due to elemental partitioning during annealing. Initially it has been observed that as annealing temperature increases, the fraction of reverted austenite increase due to dissolution and or transformation of more martensite. It resultant in higher strength-ductility combination of developed steel. The same may be due to TRIP effect. The Xrd analysis of annealed sample (before tensile test) shows high intensity of both ferrite/martensite and austenite peaks, whereas after tensile test, it shows mainly ferrite/martensite peaks. This confirm the transformation-induced plasticity (TRIP) effect during tensile test. Further the stacking fault energy (SFE), as calculated by modified Olson and Cohen method, also represent the TRIP as major deformation mechanism in the developed steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Mechanical Properties |