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    Volume 49, Issue 1 (January 2021)

    Analysis of Phase Transformation and Mechanical Properties of 55CrMo Steel during Induction Hardening

    (Received 1 February 2018; accepted 2 October 2018)

    Published Online: 2021

    CODEN: JTEVAB

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    Abstract

    To optimize the parameters of induction hardening and improve the surface hardness distribution of ball screw, the effects of the induction heating temperature on the microstructure and mechanical properties of 55CrMo steel were investigated. The specimens were heated up to 800°C, 850°C, 900°C, 950°C, 1,000°C, or 1,100°C by the induction heating power supply. Microstructural characterization of specimens was performed using an optical microscope and a high-resolution scanning electron microscope. The volume fraction of the retained austenite was measured using an X-ray diffractometer. The mechanical properties were evaluated by a microhardness tester and an electronic universal testing machine. The results show that the volume fraction of martensite in the hardened specimen increases with the increasing of heating temperature. A mixed microstructure consisting of ferrite + pearlite, bainite, and martensite is produced because of the nonfully and nonuniform austenitic state of original microstructure as the heating temperature is at 800°C. A full martensite can be produced as the heating temperature is more than 850°C. The volume fraction of retained austenite in the hardened specimen is lower when the heating temperature is in the range of 850°C–950°C; nonetheless, the volume fraction of retained austenite increases, and the tensile strength of the specimen reduces with the increasing of the heating temperature when the heating temperature is more than 950°C. The 55CrMo steel has good microstructure and mechanical properties and can meet the requirements of ball screw when the induction heating temperature is in the range of 850°C–950°C.

    Author Information:

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

    Zhou, Weilu
    School of Materials Science and Engineering, Shandong University of Science and Technology, Huangdao, Qingdao, Shandong

    Liu, Haijuan
    School of Materials Science and Engineering, Shandong University of Science and Technology, Huangdao, Qingdao, Shandong

    Li, Zhichao
    School of Materials Science and Engineering, Shandong University of Science and Technology, Huangdao, Qingdao, Shandong

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


    Stock #: JTE20180081

    ISSN:0090-3973

    DOI: 10.1520/JTE20180081

    Author
    Title Analysis of Phase Transformation and Mechanical Properties of 55CrMo Steel during Induction Hardening
    Symposium ,
    Committee A01