Volume 6, Issue 5 (May 2009)

    Enhanced Hardenability through Application of Magnetic Fields

    (Received 11 April 2008; accepted 30 March 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    Even with the great improvements in new materials, the substitution of steels in most applications is not yet economically justifiable. Steels are the most important alloys utilized as structural materials and will certainly continue to be so in the next decades. The effects of the conventional heat treatments in changing the mechanical properties of steels are well known by now. However, the effects of magnetic fields on phase transformations have recently been considered and new perspectives of study and of applications are now being opened for steels. Magnetic fields lower the Gibbs free energy, and the transformation temperature of steels increases for an applied magnetic field. As a result, different properties and microstructures could be achieved after heat treatments due to magnetic field effect. The main objective of this work is to show a process to enhance the hardenability of steels through modifications in heat treatment. The chemical composition of the material studied is similar to AISI 52100 steel. The procedure consists of applying a magnetic field in the sample throughout or in different steps of the heat treatment. All the samples were heat treated at the same temperature and cooled at the same cooling rate. The results of the magnetic field applied in steel samples were compared to conventional heat treatments. A significant improvement in microhardness of the samples was measured after applying a magnetic field. A considerable rise in the hardenability and a modification in the Fe-C equilibrium diagram were also verified, as shown in the literature.


    Author Information:

    Machado, Izabel Fernanda
    Department of Mechatronics and Mechanical Systems Engineering, Polytechnic School, University of São Paulo, São Paulo,


    Stock #: JAI101780

    ISSN: 1546-962X

    DOI: 10.1520/JAI101780

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    Author
    Title Enhanced Hardenability through Application of Magnetic Fields
    Symposium , 0000-00-00
    Committee A01