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Microstructure, property and deformation and fracture behavior of 800 MPa complex phase steel with different coiling temperatures

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Abstract

The microstructure characteristics and properties (especially hole expansion property) of 800 MPa hot-rolled complex phase steel with different coiling temperatures were studied. The microstructure consisted of polygonal ferrite and precipitates when the steel was coiled at 550 °C, and when the steel was coiled between 460–520 °C, the microstructure was composed of granular bainite and martensite and austenite (M/A) islands. The morphology of the crack was analyzed by scanning electron microscopy, and the in situ scanning electron microscope tensile test was used to find out the fracture mechanism and deformation behavior of the steel with different coiling temperatures. When the steel was coiled at 550 °C, the cracks initiated at the ferrite grain boundary and propagated through the grains or along the grain boundaries. When the steel was coiled at 520 °C, the cracks first initiated at the junction of ferrite and M/A island and then propagated through the grains. The steel coiled at 520 °C has quite good mechanical properties and relatively high hole expansion ratio.

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Acknowledgements

This work was supported by the Foundation of China Electric Power Research Institute (No. 51601174).

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Jian-zhong Xue, Zheng-zhi Zhao & Di Tang

  2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing, 100083, China

    Jian-zhong Xue, Zheng-zhi Zhao & Di Tang

  3. VALIN LY STEEL Co., Ltd., Loudi, 417000, Hunan, China

    Hui Li, Hao-hong Wu, Wei-liang Xiong & Liang Liang

  4. China Electric Power Research Institute, Beijing, 100085, China

    Yao Huang

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  1. Jian-zhong Xue
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  3. Di Tang
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  4. Hui Li
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Correspondence to Zheng-zhi Zhao.

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Xue, Jz., Zhao, Zz., Tang, D. et al. Microstructure, property and deformation and fracture behavior of 800 MPa complex phase steel with different coiling temperatures. J. Iron Steel Res. Int. 28, 346–359 (2021). https://doi.org/10.1007/s42243-020-00502-0

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  • DOI: https://doi.org/10.1007/s42243-020-00502-0

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