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Outstanding Synergy of Superior Strength and Ductility in Heterogeneous Structural 1045 Carbon Steel

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Abstract

Superior strength-ductility synergy of 1045 carbon steel produced by aluminothermic reaction casting method was obtained through large deformation rolling at ambient temperature and subsequent annealing, meanwhile, a heterogeneous composite structure was fabricated. The heterogeneous structural 1045 carbon steel consists of “soft” microcrystalline/ultrafine grained (UFG) ferrite and “hard” cementite nanoparticles. The outstanding strength-ductility synergy was primarily attributed to the microstructure characteristics about the “soft/hard” interfaces of heterogeneous composite structure. The strength was improved due to the second phase reinforcement of hard cementite nanoparticles and decreasing of ferrite grain size, meanwhile, the back stress hardening capacity of “soft/hard” phase also resulted in the high strength. And the favorable ductility was ascribed to the generation of geometrically necessary dislocations (GNDs) around “soft/hard” interfaces, which resulted in the high work hardening capability of heterogeneous structural 1045 carbon steel. It is remarkable that tensile strength (∼ 1190 MPa) and high yield strength (∼ 1118 MPa) and good ductility (∼10.6%) can be simultaneously acquired for the cold rolled 1045 steel after annealing at 673 K for 1 h.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (51561020).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Zhengning Li, Peiqing La, Jie Sheng, Yu Shi & Xueyuan Zhou

  2. School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China

    Zhengning Li & Qian Meng

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  1. Zhengning Li
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  2. Peiqing La
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  3. Jie Sheng
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  4. Yu Shi
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  5. Xueyuan Zhou
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  6. Qian Meng
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Correspondence to Peiqing La.

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Li, Z., La, P., Sheng, J. et al. Outstanding Synergy of Superior Strength and Ductility in Heterogeneous Structural 1045 Carbon Steel. Met. Mater. Int. 27, 2562–2574 (2021). https://doi.org/10.1007/s12540-020-00662-4

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  • DOI: https://doi.org/10.1007/s12540-020-00662-4

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