About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Three-Dimensional Analysis on Microstructure Evolution of as-Quenched Medium-Carbon Martensitic Steel |
| Author(s) |
Akinobu Shibata, Goro Miyamoto, Shigekazu Morito, Akiko Nakamura, Taku Moronaga, Houichi Kitano, Toru Hara |
| On-Site Speaker (Planned) |
Akinobu Shibata |
| Abstract Scope |
Due to the increasing demand for advanced high-strength steels in transportation and power generation, lath martensite structures have attracted renewed interest. Although lath martensite is a long-studied microstructure, its detailed structure remains insufficiently understood, limiting microstructure design for novel advanced high-strength steels.
This study investigated the substructures and crystallographic features of as-quenched lath martensite in a medium-carbon steel using FIB-SEM serial sectioning technique. The results revealed that the smallest structural units are plate-like, rather than the ideal lath-shaped. Each martensite plate contains twin-related variants, which are also plate-like, with inter-variant boundaries nearly parallel to the close-packed planes of martensite. Simple micromechanics calculations suggest that the twin-related variants is driven by their low interaction energy with the stress field created by pre-existing martensite. This implies that stress-induced variant selection is a key mechanism governing the formation of twin-related variants during the martensitic transformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Phase Transformations |