Abstract
The strength improvement of low-carbon steel usually occurs at the expense of its ductility because the strain-hardening rate of ultrafine-grained material is relatively low. The heterostructured strategy is a new way to improve the strain-hardening rate in carbon steels, and is easy to achieve by phase transformation. In this work, intercritical annealing was performed on a low-carbon steel to produce a dual-phase heterostructure, which had higher strength and ductility than that of a uniform ferrite microstructure. An outstanding UTS of 960 MPa and a high uniform elongation of 16.5% were obtained in the heterostructured sample. In situ electron backscattered diffraction was performed to investigate the underlying deformation mechanism. Due to the mechanical incompatibility between ferrite and martensite, a much higher density of low-angle grain boundaries was found in the dual-phase heterostructured steel. Significant strain partitioning during deformation leads to a high density of geometrically necessary dislocations (GNDs) near zone boundaries. These GNDs provide hetero-deformation-induced strain hardening, eventually improving the combination of strength and ductility.
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Acknowledgements
This work was supported by the National Key R&D Program of China (Grant Number 2021YFA1200203), the Key Program of National Natural Science Foundation of China (Grant Number 51931003), the Hong Kong Research Grants Council (GRF 11214121), the National Natural Science Foundation of China (Grant Numbers 52071178, 52171118, 51901103, and 52201124), the Natural Science Foundation of Jiangsu Province (Grant Number BK20220960), the China Postdoctoral Science Foundation (Grant Number 2021M701715), Jiangsu Funding Program for Excellent Postdoctoral Talent (Grant Number 2022ZB279), Jiangsu Key Laboratory For Light Metal Alloys (Grant Number LMA202202). We also thank the technical support from the Jiangsu Key Laboratory of Advanced Micro&Nano Materials and Technology. The SEM and TEM experiments were performed at the Materials Characterization and Research Center of Nanjing University of Science and Technology.
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B.G. and H.Z. designed the project and guided the research. Y.L. and M.Y. conducted the experiments. L.R.X., B.G., and X.J.C. conducted the TEM experiments. M.Y. prepared the material. Y.L., J.X.M. and J.X.W. analyzed the data. Y.T.Z., H.Z. and B.G. performed the theoretical analysis. Y.L., B.G. and H.Z. wrote the manuscript. All authors contributed to the extensive discussions of the results.
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Liu, Y., Gao, B., Yang, M. et al. Significant Hetero-Deformation Induced Strain Hardening in a Dual-Phase Low-Carbon Steel. JOM 75, 1383–1392 (2023). https://doi.org/10.1007/s11837-022-05529-0
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DOI: https://doi.org/10.1007/s11837-022-05529-0