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Magnetic Hysteresis Loop as a Tool for the Evaluation of Mechanical Properties of Hypoeutectoid Pearlitic Steels with Spheroidization Heat Treatmemt

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Abstract

Spheroidization heat treatments were carried out at 700 °C in two industrially produced hypo-eutectoid pearlitic steels. The heat treatments lead to change in microstructure in terms of volume fraction and morphology of the cementites. Magnetic hysteresis loop measurement was carried out along with bulk hardness and mechanical properties of the steels at various lengths of time up to 100 h. A linear decrease in tensile strength, breaking strength, bulk hardness and coercivity was found with increase in annealing time for the spheroidization of cementites leading to decrease in pinning density for dislocations movement and magnetic domain wall motion for the increase in inter lamellae spacing and carbide spacing. The uniform elongation and total elongation were increased with spheroidization annealing. A strong correlation of coercivity with the mechanical properties indicates their precise evaluation by measuring coercivity in the spheroidization heat treated steels through a portable magnetic NDE device.

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Authors and Affiliations

  1. R & D and SS, JSW Steel Limited, Toranagallu, Bellary, 583275, India

    J. N. Mohapatra, T. Suman Babu, Satish Kumar Dabbiru & G. Balachandran

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  1. J. N. Mohapatra
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  2. T. Suman Babu
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  3. Satish Kumar Dabbiru
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  4. G. Balachandran
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Mohapatra, J.N., Babu, T.S., Dabbiru, S.K. et al. Magnetic Hysteresis Loop as a Tool for the Evaluation of Mechanical Properties of Hypoeutectoid Pearlitic Steels with Spheroidization Heat Treatmemt. J Nondestruct Eval 40, 73 (2021). https://doi.org/10.1007/s10921-021-00804-7

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