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Correlation of Microstructure Feature with Impact Fracture Behavior in a TMCP Processed High Strength Low Alloy Construction Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The present article aims at elucidating the effect of thermo-mechanical controlled processing (TMCP), especially the finish cooling temperature, on microstructure and mechanical properties of high strength low alloy steels for developing superior low temperature toughness construction steel. The microstructural features were characterized by scanning electron microscope equipped with electron backscatter diffraction, and the mechanical behaviors in terms of tensile properties and impact toughness were analyzed in correlation with microstructural evolution. The results showed that the lower finish cooling temperature could lead to a considerable increase in impact toughness for this steel. A mixed microstructure was obtained by TMCP at lower finish cooling temperature, which contained much fine lath-like bainite with dot-shaped M/A constituent and less granular bainite and bainite ferrite. In this case, this steel possesses yield and ultimate tensile strengths of ~ 885 MPa and 1089 MPa, respectively, and a total elongation of ~ 15.3%, while it has a lower yield ratio of ~ 0.81. The superior impact toughness of ~ 89 J at −20 °C was obtained, and this was resulted from the multi-phase microstructure including grain refinement, preferred grain boundaries misorientation, fine lath-like bainite with dot-shaped M/A constituent.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51904071), the Independent Project of State Key Laboratory of Rolling and Automation, Northeastern University (Grant No. ZZ202001), the Key Research and Development Program of Hebei Province of China (Grant No. 18211019D), and the Start-up Project of Doctor Scientific Research of Liaoning Province (Grant No. 2020-BS-271).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Wen-Ting Zhu, Zhen-Ye Chen & Li-Qing Chen

  2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Jun-Jun Cui

  3. User Technology Department, Technology Research Institute of HBIS, Shijiazhuang, 050000, China

    Zhen-Ye Chen

  4. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Yang Zhao

Authors
  1. Wen-Ting Zhu
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  2. Jun-Jun Cui
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  3. Zhen-Ye Chen
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  4. Yang Zhao
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  5. Li-Qing Chen
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Corresponding authors

Correspondence to Jun-Jun Cui or Li-Qing Chen.

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Zhu, WT., Cui, JJ., Chen, ZY. et al. Correlation of Microstructure Feature with Impact Fracture Behavior in a TMCP Processed High Strength Low Alloy Construction Steel. Acta Metall. Sin. (Engl. Lett.) 35, 527–536 (2022). https://doi.org/10.1007/s40195-021-01250-0

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  • DOI: https://doi.org/10.1007/s40195-021-01250-0

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