Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels

Scientific Reports
Seok Su SohnSunghak Lee

Abstract

Ferrite + austenite duplex lightweight steels have been actively developed by adding low-density Al for overcoming a limitation of stiffness deterioration by a traditional approach to obtain a weight reduction. Multiple-stage deformation mechanism in lightweight steels, i.e., simultaneous formation of deformation-induced martensite and deformation twin and additional plasticity by twinning, has been nominated as an attractive strategy, but shows a steady flow behavior with early plastic instability. Here, we present a newly designed Fe-0.3C-9Mn-5Al steel in order to obtain an optimal level of stability of austenite and a resultant outstanding combination of tensile strength and ductility, e.g., 874 MPa and 72%, together with sufficiently high strain hardening. These enhanced properties are attributed to the decreased austenite stability by controlling the austenite size and alloying partitioning due to variation in austenite fraction inside duplex microstructures. The present work gives a promise for structural applications requiring both reduced specific weight and remarkable deformability.

References

Mar 12, 2013·Science and Technology of Advanced Materials·Hansoo KimNack J Kim

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Citations

Jun 28, 2018·Proceedings of the National Academy of Sciences of the United States of America·Muxin YangXiaolei Wu

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Methods Mentioned

BETA
X-ray

Software Mentioned

TexSEM
Thermocalc

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