Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Evaluation of Embrittlement in Isochronal Aged Fe-Cr Alloys by Magnetic Hysteresis Loop Technique

  • Mohapatra, J.N. (NDE and Science Research Center, Faculty of Engineering, Iwate University) ;
  • Kamada, Y. (NDE and Science Research Center, Faculty of Engineering, Iwate University) ;
  • Kikuchi, H. (NDE and Science Research Center, Faculty of Engineering, Iwate University) ;
  • Kobayashi, S. (NDE and Science Research Center, Faculty of Engineering, Iwate University) ;
  • Echigoya, J. (NDE and Science Research Center, Faculty of Engineering, Iwate University) ;
  • Park, D.G. (Korea Atomic Energy Research Institute) ;
  • Cheong, Y.M. (Korea Atomic Energy Research Institute)
  • Received : 2011.03.25
  • Accepted : 2011.05.27
  • Published : 2011.06.30
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Abstract

Fe-Cr alloys with different Cr contents were prepared by an arc melting technique. The alloys were isochronally aged in the range from $400^{\circ}C$ to $900^{\circ}C$ with $50^{\circ}C$ steps with a holding time of 100 hours. The ageing produced embrittlement in the alloys due to either the formation of a Cr-rich ${\alpha}'$ phase or a $\sigma$ phase at high temperatures. Magnetic Hysteresis Loop (MHL) and Micro-Vickers hardness were measured at each step to correlate the magnetic and mechanical properties. Coercivity and hardness of the alloys were increased and remanence decreased up to 500-$550^{\circ}C$ due to formation of a Cr-rich ${\alpha}'$ phase. Beyond 500-$550^{\circ}C$ range, the coercivity and hardness decreased and remanence increased due to the coarsening or dissolution of the Cr-rich ${\alpha}'$ phase. In the Fe-48% Cr alloy, formation of the $\sigma$ phase at $700^{\circ}C$ reduced the maximum induction of the alloy significantly.

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