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    Volume 6, Issue 1 (September 2017)

    Influence of Hot Rolling Process on the Microstructure and Mechanical Properties of a Press Hardening Steel

    (Received 16 November 2016; accepted 14 March 2017)

    Published Online: 26 September 2017

    CODEN: MPCACD

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    Abstract

    In this article, microstructure and mechanical properties of a press hardening steel prepared with different rolling parameters are studied, and the effects of the rolling processes are analyzed. The results show that when the finishing rolling temperatures are 870°C and 900°C and the coiling temperature rises from 640°C to 700°C, the strength of the press hardening steel increases and the elongation decreases. The yield strength of the steel prepared with low finishing rolling temperature is high, but the tensile strength has little difference, and the elongation decreases quickly. The microstructures consist of ferrite and pearlite, but as the coiling temperature rises, the amount of the alloy-carbide precipitates in the ferrite, and grain boundary is reduced significantly. The interlamellar spacing of pearlite gradually becomes narrow and the density of dislocation lines in the ferrite increases slightly. The press hardening steel rolled at the finishing temperature of 900°C and coiled at 670°C has excellent balance of mechanical properties. The yield strength, ultimate tensile strength, and elongation are 370 MPa, 598 MPa, and 19 %, respectively.

    Author Information:

    Hu, Kuanhui
    College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan,

    Research and Development Center of Wuhan Iron and Steel Group Corp., Wuhan,

    Zhou, Guifeng
    Research and Development Center of Wuhan Iron and Steel Group Corp., Wuhan,

    College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan,


    Stock #: MPC20160120

    ISSN:2379-1365

    DOI: 10.1520/MPC20160120

    Author
    Title Influence of Hot Rolling Process on the Microstructure and Mechanical Properties of a Press Hardening Steel
    Symposium ,
    Committee A01