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Magnetic Hysteresis Loop as a Tool for the Evaluation of Spheroidization of Cementites in Pearlitic Steels

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Abstract

Pearlitic Fe-0.76wt.% C binary alloy was isothermally annealed at 700 °C up to 100 h to study the spheroidization of cementites and its effect on both the mechanical and magnetic properties with the aim to use the magnetic techniques for the evaluation of spheroidization in steels. Micro-Vickers hardness, magnetic hysteresis loop (MHL) measurements, optical and scanning electron microscopy studies were carried out at various lengths of time by interrupting the test. Microhardness and coercivity were decreased with increase in annealing time due to reduction in dislocation pinning and magnetic domain wall pinning for the breaking of cementite lamella and their subsequent transformation to spheroidal form. The microhardness and coercivity showed a very good correlation with the change in microstructure indicating that MHL would be a suitable non-destructive evaluation tool for the evaluation of spheroidized pearlitic steels.

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  1. J. N. Mohapatra

    Present address: R & D and SS, JSW Steel Limited, Toranagallu, Bellary, 583275, India

Authors and Affiliations

  1. NDE & SRC, Faculty of Engineering, Iwate University, Morioka, 020-8551, Japan

    Y. Kamada

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  1. J. N. Mohapatra
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  2. Y. Kamada
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Correspondence to J. N. Mohapatra.

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Mohapatra, J.N., Kamada, Y. Magnetic Hysteresis Loop as a Tool for the Evaluation of Spheroidization of Cementites in Pearlitic Steels. J. of Materi Eng and Perform 24, 1551–1557 (2015). https://doi.org/10.1007/s11665-015-1385-5

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  • DOI: https://doi.org/10.1007/s11665-015-1385-5

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