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Mechanical Behavior and Microstructure Evolution during Tensile Deformation of Twinning Induced Plasticity Steel Processed by Warm Forgings

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Abstract

The mechanical behavior and microstructural evolution of an Fe-30Mn-3Al-3Si twinning-induced plasticity (TWIP) steel processed using warm forging was investigated. It is found that steel processed via warm forging improves comprehensive mechanical properties compared to the TWIP steel processed via cold rolling, with a high tensile strength (Rm) of 793 MPa, a yield strength (RP) of 682 MPa, an extremely large RP/Rm ratio as high as 0.86 as well as an excellent elongation rate of 46.8%. The microstructure observation demonstrates that steel processed by warm forging consists of large and elongated grains together with fine, equiaxed grains. Complicated micro-defect configurations were also observed within the steel, including dense dislocation networks and a few coarse deformation twins. As the plastic deformation proceeds, the densities of dislocations and deformation twins significantly increase. Moreover, a great number of slip lines could be observed in the elongated grains. These findings reveal that a much more dramatic interaction between microstructural defect and dislocations glide takes place in the forging sample, wherein the fine and equiaxed grains propagated dislocations more rapidly, together with initial defect configurations, are responsible for enhanced strength properties. Meanwhile, larger, elongated grains with more prevalently activated deformation twins result in high plasticity.

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Authors and Affiliations

  1. School of Aerospace and Mechanical Engineering Flight College, Changzhou Institute of Technology, Changzhou, 213032, China

    Wen Wang  (王文)

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

    Modi Zhao, Xingfu Wang & Fusheng Han  (韩福生)

  3. School of Physics and Electronic Information, Yan’an Unicersity, Yan’an, 716000, China

    Dan Wang  (汪聃)

Authors
  1. Wen Wang  (王文)
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  2. Modi Zhao
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  3. Xingfu Wang
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  4. Dan Wang  (汪聃)
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  5. Fusheng Han  (韩福生)
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Corresponding authors

Correspondence to Dan Wang  (汪聃) or Fusheng Han  (韩福生).

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All authors declare that there are no competing interests.

Additional information

Funded by the National Natural Science Foundation of China (Nos.51701206 and 51671187), the Shanxi Natural Science Foundation (No.2019JQ-833), the Anhui Natural Science Foundation (1808085QE166), the Special Scientific Research Project of Shanxi Education Committee (No.19JQ0974), and the Doctoral Research Initiation Project of Yan’an University (NoYDBD2018-21)

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Wang, W., Zhao, M., Wang, X. et al. Mechanical Behavior and Microstructure Evolution during Tensile Deformation of Twinning Induced Plasticity Steel Processed by Warm Forgings. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 417–424 (2024). https://doi.org/10.1007/s11595-024-2897-3

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  • DOI: https://doi.org/10.1007/s11595-024-2897-3

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