Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel

Xiao-pei Wang, Ai-min Zhao, Zheng-zhi Zhao, Yao Huang, Liang Li, Qing He

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    Xiao-pei Wang, Ai-min Zhao, Zheng-zhi Zhao, Yao Huang, Liang Li, and Qing He, Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel, Int. J. Miner. Metall. Mater., 21(2014), No. 3, pp.266-272. https://dx.doi.org/10.1007/s12613-014-0904-y
    Xiao-pei Wang, Ai-min Zhao, Zheng-zhi Zhao, Yao Huang, Liang Li, and Qing He, Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel, Int. J. Miner. Metall. Mater., 21(2014), No. 3, pp.266-272. https://dx.doi.org/10.1007/s12613-014-0904-y
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    Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel

    • Engineering Research Institute, University of Science and Technology Beijing, Beijing, 100083, China

    基金项目: 

    financial support by the National Natural Science Foundation of China (No. 51271035)

    the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20110006110007)

      通信作者:

      Ai-min Zhao E-mail: aimin.zhao@ustb.edu.cn

    中文摘要

    The microstructures and properties of hot-rolled low-carbon ferritic steel have been investigated by optical microscopy, field-emission scanning electron microscopy, transmission electron microscopy, and tensile tests after isothermal transformation from 600℃ to 700℃ for 60 min. It is found that the strength of the steel decreases with the increment of isothermal temperature, whereas the hole expansion ratio and the fraction of high-angle grain boundaries increase. A large amount of nanometer-sized carbides were homogeneously distributed throughout the material, and fine (Ti, Mo)C precipitates have a significant precipitation strengthening effect on the ferrite phase because of their high density. The nanometer-sized carbides have a lattice parameter of 0.411–0.431 nm. After isothermal transformation at 650℃ for 60 min, the ferrite phase can be strengthened above 300 MPa by precipitation strengthening according to the Ashby-Orowan mechanism.

     

    Mechanical properties and characteristics of nanometer-sized precipitates in hot-rolled low-carbon ferritic steel

    Author Affilications

      • Engineering Research Institute, University of Science and Technology Beijing, Beijing, 100083, China

    • Funds: 

      financial support by the National Natural Science Foundation of China (No. 51271035)

      the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20110006110007)

    • Received: 28 July 2013; Revised: 20 November 2013; Accepted: 21 November 2013;
    The microstructures and properties of hot-rolled low-carbon ferritic steel have been investigated by optical microscopy, field-emission scanning electron microscopy, transmission electron microscopy, and tensile tests after isothermal transformation from 600℃ to 700℃ for 60 min. It is found that the strength of the steel decreases with the increment of isothermal temperature, whereas the hole expansion ratio and the fraction of high-angle grain boundaries increase. A large amount of nanometer-sized carbides were homogeneously distributed throughout the material, and fine (Ti, Mo)C precipitates have a significant precipitation strengthening effect on the ferrite phase because of their high density. The nanometer-sized carbides have a lattice parameter of 0.411–0.431 nm. After isothermal transformation at 650℃ for 60 min, the ferrite phase can be strengthened above 300 MPa by precipitation strengthening according to the Ashby-Orowan mechanism.

     

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