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    Volume 8, Issue 2 (March 2019)

    Special Issue Paper

    A Study on the Effect of Austempering Temperature on Microstructure and Mechanical Properties of DIN 36CrNiMo4 Carbide-Free Nano Bainitic Steel

    (Received 4 February 2018; accepted 7 May 2018)

    Published Online: 10 September 2018

    CODEN: MPCACD

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    Abstract

    In this study, the effects of the austempering temperature on the microstructure and mechanical properties of carbide-free nano bainitic steel (CFB) were discussed. For the achievement of CFB 2 wt. %, silicon was added to DIN 36CrNiMo4 steel, austempered at 450°C and 300°C for 1.5 hours and 10 hours, respectively, and then quenched in oil. The microstructure was studied by optical microscope, scanning electron microscope, and X-ray crystallography. The results showed that the 300°C austempered samples contained the ferrite phase to a greater degree than the martensitic phase. The higher amounts of martensite in the 450°C austempered samples were due to the higher amounts of initial retaining austenite that transformed to martensite in oil quenching. Also, in the samples where carbide participated, there were lower degrees of the martensitic phase, and no carbides afford higher impact toughness and lower hardness for the 300°C austempered sample. As a result of the higher impact toughness in the ball mill wear test, the 300°C austempered sample has a lower weight loss than the 450°C austempered sample.

    Author Information:

    Garmeh, Behdad
    Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad,

    Kasiri-Asgarani, Masoud
    Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad,

    Amini, Kamran
    Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad,

    Department of Mechanical Engineering, Tiran Branch, Islamic Azad University, Tiran, Isfahan

    Ghayour, Hamid
    Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad,


    Stock #: MPC20180022

    ISSN:2379-1365

    DOI: 10.1520/MPC20180022

    Author
    Title A Study on the Effect of Austempering Temperature on Microstructure and Mechanical Properties of DIN 36CrNiMo4 Carbide-Free Nano Bainitic Steel
    Symposium ,
    Committee A01