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    Volume 8, Issue 5 (October 2019)

    Special Issue Paper

    Hot Deformation Behavior of Fe-6.8Al Low-Density and AISI 1040 Steels

    (Received 17 January 2019; accepted 18 March 2019)

    Published Online: 2019

    CODEN: MPCACD

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    Abstract

    Steels are the traditional choice for automobile bodies due to their low cost and good combination of strength, ductility, and formability. Aluminum-containing low-density steels have recently been materials of immense attention due to the quest for a weight reduction of automobiles. For these applications, steel parts are produced by casting, followed by forming operations at an elevated temperature. Furthermore, the application of low-density steels is highly envisaged in automobile applications. Therefore, in the present investigation, the hot deformation behavior of single phase Fe-6.8Al low-density steel, and American Iron and Steel Institute (AISI) 1040 dual phase steel has been evaluated by developing strain rate sensitivity maps. Hot compression tests were carried out at temperatures ranging between 500 and 900°C and 650 and 900°C for the Fe-6.8Al and AISI 1040 steels, respectively, at strain rates between 0.001 and 10 s−1. Microstructural features have been evaluated for both the steels and correlated to the deformation behavior. For the Fe-6.8Al steel, strain localization in the form of shear bands is detected during deformation below 600°C in the strain rate range between 1 and 10 s−1. The dynamic recrystallization of ferrite in Fe-6.8Al steel is also noted during compression at 800 and 900°C for strain rates 0.01 and 0.001 s−1. For the AISI 1040 steel, based on the microstructural features, dynamic recovery and dynamic recrystallization is reported to occur at 700 and 850°C, respectively. The optimized deformation conditions (temperature and strain rate) for the Fe-6.8Al and AISI 1040 steels are determined to be 900°C, 0.001 s−1 and 850°C, 0.001 s−1, respectively.

    Author Information:

    Pramanik, Sudipta
    Department of Materials Engineering, Indian Institute of Science, Bangalore,

    Pund, Tushar S.
    Department of Materials Engineering, Indian Institute of Science, Bangalore,

    Avadhani, G. S.
    Department of Materials Engineering, Indian Institute of Science, Bangalore,

    Suwas, Satyam
    Department of Materials Engineering, Indian Institute of Science, Bangalore,


    Stock #: MPC20190019

    ISSN:2379-1365

    DOI: 10.1520/MPC20190019

    Author
    Title Hot Deformation Behavior of Fe-6.8Al Low-Density and AISI 1040 Steels
    Symposium ,
    Committee A01