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Ultrahigh Strength Induced by Superstorage Capacity of Dislocations in an Ultrafine-Grained Fe-9Mn-0.15Si-0.26C Steel

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Abstract

A Fe-9Mn-0.15Si-0.26C steel was prepared via warm rolling, showing the heterogeneous microstructures composed of ultrafine-grained ferrite (~ 330 nm) and nanoscale twins (~ 40 nm) in the lamellar austenite. We aim to improve the strain-hardening rate (SHR) via the transformation-induced-plasticity (TRIP) and twinning-induced-plasticity (TWIP) effects. The steel shows ultrahigh yield strength of 710 ± 10 MPa and ultimate tensile strength of 2410 ± 20 MPa, with the total elongation of 27%. Such an ultrahigh strength is rarely reported for the advanced high strength steels (AHSSs). By controlling the specific strain level, the deformation mechanisms governing the different stages of the warm-rolled steel are explored, suggesting significant differences compared to the typical structural metallic alloys. The uplifted stress-strain curve and continuously increasing hardening curve can be attributed to the continuous martensite transformation and twinning process during the whole strain, and the moderate stability of austenite has played a role. In addition, the geometrical necessary dislocation, \({\rho }_{GND}\), is 1.04 ×1015 m−2 in the fractured specimen (ɛ = 27%), leading to a strain hardening of 1753 MPa.

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Acknowledgement

This Project is supported by the National Key R&D Program of China (2021YFA1200203), and the Natural Science Foundation of China (NSFC) (No. 51574079).

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  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    C. Sun

  2. The State Key Lab of Rolling & Automation, Northeastern University, Shenyang, 110819, China

    Y. F. Shen & W. Y. Xue

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Sun, C., Shen, Y.F. & Xue, W.Y. Ultrahigh Strength Induced by Superstorage Capacity of Dislocations in an Ultrafine-Grained Fe-9Mn-0.15Si-0.26C Steel. J. of Materi Eng and Perform 31, 6773–6783 (2022). https://doi.org/10.1007/s11665-022-06735-2

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