Ultra-high strength and ductility of low-Mn lightweight steel achieved through a four-phase lamellar structure design
Low-Mn lightweight steels typically face challenges in achieving high strength and ductility due to the presence of δ-ferrite, which also severely limits transverse elongation when present as long-strip formations. This study successfully overcame these limitations by constructing a four-phase lamel...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-06-01
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| Series: | Materials Research Letters |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21663831.2025.2482653 |
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| Summary: | Low-Mn lightweight steels typically face challenges in achieving high strength and ductility due to the presence of δ-ferrite, which also severely limits transverse elongation when present as long-strip formations. This study successfully overcame these limitations by constructing a four-phase lamellar structure, resulting in an optimal strength-ductility balance (∼1.0 GPa YS, ∼1.45 GPa UTS, and 14.0% UE) and a notable improvement in transverse elongation. The introduction of a soft phase and a strain transition zone near δ-ferrite and martensite enhanced strain distribution uniformity, while retained austenite, precipitation strengthening, and heterogeneous strengthening further contributed to the superior mechanical properties. |
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| ISSN: | 2166-3831 |