About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Phase Transformations and Microstructural Evolution
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Presentation Title |
Abnormal Cryogenic Strength Enabled by Magnetic-Ordering-Driven Tetragonality in Metastable Steel |
Author(s) |
Satoshi Morooka, Naoki Igawa, Miki Sasaki, Nozomi Nabatame, Katsuaki Kodama |
On-Site Speaker (Planned) |
Satoshi Morooka |
Abstract Scope |
Medium Mn steels have been actively investigated due to their excellent balance between material cost and mechanical properties. In particular, medium Mn steel with a nominal chemical composition of Fe-5.0Mn-0.1C (mass%) fabricated by intercritical annealing 923 K for 1.8 ks after cold-rolling, was the high-strength mechanical properties at low temperature. This strengthening mechanism evaluated by means of in-situ neutron diffraction under low temperature (High Resolution Powder Diffractometer (HRPD) at Japan Research Reactor-3(JRR-3)), electron back scatter diffraction (EBSD), low temperature differential scanning calorimetry (DSC) and low temperature magnetic susceptibility measurement. We found that as the sample temperature decreases, face-centered cubic (FCC) structure transferred face-centered tetragonal (FCT) structure. Namely, it suggests that austenite transformed martensite like Fe-Pd or Fe-Pt alloy. Therefore, the origin of the high-strength mechanical properties at low temperature was in the presence of FCT martensite. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Phase Transformations, Other |