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    Volume 46, Issue 4 (July 2018)

    Special Issue Paper

    Theoretical Prediction of Forming Limit Diagrams for B1500HS Steel at Elevated Temperature Based on Modified Arrhenius and M–K Models

    (Received 26 December 2016; accepted 8 March 2017)

    Published Online: 2018

    CODEN: JTEVAB

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    Abstract

    Boron steel B1500HS deforms at elevated temperature under the complete austenite state, and it accords with the 0-angle necking type, irrespective of the strain state on the left- or right-hand side of the forming limit diagram (FLD), which is in accordance with the M–K simplified model. However, the constitutive equation significantly affects the prediction of the FLD of the sheet metal. In this study, the modified Arrhenius model, including the deformation activation energy and the deformation temperature, describing the hot deformation of the sample with austenitic microstructure combined with the Logan–Hosford yield criterion and the Von Mises yield criterion, was used to predict the forming limits of boron steel B1500HS. The theoretical calculation of the forming limits for B1500HS steel at elevated temperature and under different conditions was carried out, and the FLD predicted by the theoretical calculation was found to be in good agreement with the experimental results. It was concluded that with decrease in the initial inhomogeneity of the material, the hot forming limit curves for B1500HS steel at elevated temperature decreased, and the initial inhomogeneity coefficient f0 = 0.997 was better for the accurate prediction of the hot forming limits of boron steel. With increasing forming temperature, the forming limit curves calculated for B1500HS steel at elevated temperature increased. With increasing mean strain rate, the forming limit curves of B1500HS steel at elevated temperature increased slightly.

    Author Information:

    Hou, Hongli
    School of Materials Science & Engineering, Shandong University of Science & Technology, Huangdao, Qingdao, Shandong

    Li, Huiping
    School of Materials Science & Engineering, Shandong University of Science & Technology, Huangdao, Qingdao, Shandong

    He, Lianfang
    School of Materials Science & Engineering, Shandong University of Science & Technology, Huangdao, Qingdao, Shandong


    Stock #: JTE20160659

    ISSN:0090-3973

    DOI: 10.1520/JTE20160659

    Author
    Title Theoretical Prediction of Forming Limit Diagrams for B1500HS Steel at Elevated Temperature Based on Modified Arrhenius and M–K Models
    Symposium ,
    Committee A01