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Study on the mechanical behavior of twinning-induced plasticity steel processed by warm forging and annealing

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Abstract

The microstructures and mechanical properties of a 30Mn–3Al–3Si twinning-induced plasticity (TWIP) steel in the warmly forged and annealed states were investigated in the present study. It is shown that the as-forged and low-temperature annealed steels have similar grain morphologies and defect configurations, i.e., predominantly deformed grains together with recrystallized fine equiaxed grains as well as highly dense and complex dislocations. However, the high-temperature annealed steel showed completely different microstructures characterized by fully recrystallized grains and very few dislocations. The initially high density of dislocations in the forged and low-temperature annealed steels greatly promoted the multiplication of dislocations in the subsequently tensile deformation, leading to not only pronouncedly enhanced tensile strength but an apparent yield-point phenomenon. Compared with as-forged and low-temperature annealed steels, the high-temperature annealed steel exhibited relatively fewer increments of dislocations after tensile deformation but much more twins. These changes in the microstructures were responsible for relatively low strength and high plasticity of the steel.

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Acknowledgements

This work was jointly supported by the National Natural Science Foundation of China (51371167, 51671187 and 51701206).

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Authors and Affiliations

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, Anhui, China

    Wen Wang, Dan Wang & Fusheng Han

  2. University of Science and Technology of China, Hefei, 230026, Anhui, China

    Wen Wang

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  1. Wen Wang
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Correspondence to Fusheng Han.

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Wang, W., Wang, D. & Han, F. Study on the mechanical behavior of twinning-induced plasticity steel processed by warm forging and annealing. J Mater Sci 53, 14645–14656 (2018). https://doi.org/10.1007/s10853-018-2597-5

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  • DOI: https://doi.org/10.1007/s10853-018-2597-5

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