Effects of cerium addition on the microstructure, mechanical properties and strain hardening behaviour of TWIP steel Fe-18Mn-0.6c

ZHONG, Lingqiang, WANG, Zhigang, LUO, Quanshun and LIU, Weizhen (2022). Effects of cerium addition on the microstructure, mechanical properties and strain hardening behaviour of TWIP steel Fe-18Mn-0.6c. Materials Characterization, 183, p. 11626.

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Official URL: https://www.sciencedirect.com/science/article/pii/...
Link to published version:: https://doi.org/10.1016/j.matchar.2021.111626
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    Abstract

    The effects of cerium (Ce) on the microstructure, mechanical properties and strain hardening behavior of Fe-18Mn-0.6C twin-induced plasticity (TWIP) steel were investigated by electron backscatter diffraction, X-ray diffraction and transmission electron microscopy. Compared with the addition of Al, the addition of Ce significantly reduced the stacking fault probability of TWIP steel, which promotes the formation of deformation and annealing twins. The dynamic strain aging behavior of TWIP steel was inhibited by Al and Ce atoms during ambient deformation. The optimal mechanical properties were obtained when 0.015 wt.% of Ce was added, resulting in a tensile strength of 1023MPa; and an elongation was 92%. The interaction of twin variants in the Ce-containing alloys exhibited an X shape, which was significantly different from the T shape in the non-Ce containing alloy. This is mainly attributed to the fact that Ce promotes dislocations near grain boundaries, where for the nucleation of deformation twins at grain boundaries is favored. Compared with the T-shaped twin variants, the dynamic Hall-Petch effect caused by the X-shaped staggered twin variants was stronger, which improved the strain hardening ability of TWIP steel.

    Item Type: Article
    Uncontrolled Keywords: 0912 Materials Engineering; 0913 Mechanical Engineering; Materials
    Identification Number: https://doi.org/10.1016/j.matchar.2021.111626
    Page Range: p. 11626
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 04 Jan 2022 12:41
    Last Modified: 04 Jan 2022 12:45
    URI: http://shura.shu.ac.uk/id/eprint/29496

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