About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Grain Refinement of Dual Phase Steel Maximizes Plasticity of Martensite, Leading to Simultaneous Enhancement of Strength and Ductility |
| Author(s) |
Myeong-heom Park, Akinobu Shibata, Stefanus Harjo, Nobuhiro Tsuji |
| On-Site Speaker (Planned) |
Nobuhiro Tsuji |
| Abstract Scope |
We have found that microstructural refinement of DP steel enhanced not only its yield strength but also strain-hardening, leading to increasing both strength and ductility. Digital image correlation (DIC) analysis showed that strains were localized much more in soft ferrite than in hard martensite but the refinement of DP structure decreased the difference in average strains of ferrite and martensite, which avoided crack initiation in ferrite and led to large ductility. In-situ neutron diffraction experiment during tensile deformation quantitatively showed that higher phase stress was borne in hard martensite than in soft ferrite and microstructure refinement made martensite bear higher phase stress through the enhanced deformation constraint. The individual stress-strain curves of ferrite and martensite reconstructed from DIC and neutron diffraction results showed that microstructural refinement in DP structures enhanced deformation constraint between two phases to maximize the deformation ability of martensite, which explained the strength-ductility synergy acquired. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Other |