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    Volume 11, Issue 2 (June 2021)

    Special Issue Paper

    Formation of Ultrafine Single-Variant Martensite from Prior Ferrite + Cementite Microstructure and Its Mechanical Properties

    (Received 9 December 2020; accepted 2 April 2021)

    Published Online: 16 June 2021

    CODEN: MPCACD

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    Abstract

    In the present investigation, changes in the single-variant martensite structure of 0.1%C-2%Si-5%Mn steel with a decrease in the prior austenite grain size have been investigated. While prior austenite grain size in the range of 150 to 24 µm led to the formation of martensite with a multi-packet and multi-block structure, a single packet and multi-block martensite structure formed from the prior austenite grain size of about 7 µm. Furthermore, the prior austenite grain size of about 2 µm led to the formation of a single-variant (single-block) martensite structure. This microstructural analysis indicates that the critical prior austenite grain size to form martensite with a single-variant structure is about 2 µm. The tensile strength (TS, 1,490 MPa), uniform elongation (UEL, 7.1 %), and total elongation (TEL, 14.2 %) of the single-variant martensite was found to be higher than that of the multi-packet multi-block martensite (TS = 1,270 MPa, UEL = 6.2 %, and TEL = 13.6 %). The improvement in the mechanical properties of the single-variant martensite was attributed to enhancement in its strain-hardening rate as a result of change in the structure from the multivariant to the single variant.

    Author Information:

    Torizuka, Shiro
    Department of Materials and Synchrotron Radiation Engineering, The Graduate School of Engineering, University of Hyogo, Himeji, Hyogo

    Oya, Ryusuke
    Department of Materials and Synchrotron Radiation Engineering, The Graduate School of Engineering, University of Hyogo, Himeji, Hyogo

    Prasad, Kartik
    Department of Materials and Synchrotron Radiation Engineering, The Graduate School of Engineering, University of Hyogo, Himeji, Hyogo

    Ito, Atsushi
    Department of Materials and Synchrotron Radiation Engineering, The Graduate School of Engineering, University of Hyogo, Himeji, Hyogo


    Stock #: MPC20200187

    ISSN:2379-1365

    DOI: 10.1520/MPC20200187

    Author
    Title Formation of Ultrafine Single-Variant Martensite from Prior Ferrite + Cementite Microstructure and Its Mechanical Properties
    Symposium ,
    Committee A01