Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Long-Term Aging Diagnosis of Rotor Steel Using Acoustic Nonlinearity

  • Kim, Chung-Seok (Automotive Engineering, Hanyang University) ;
  • Park, Ik-Keun (Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Jhang, Kyung-Young (School of Mechanical Engineering, Hanyang University) ;
  • Hyun, Chang-Yong (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • Received : 2011.09.19
  • Accepted : 2011.12.08
  • Published : 2011.12.30
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Abstract

The long-term aging of ferritic 2.25CrMo steel was characterized using the acoustic nonlinear effect in order to apply to diagnose the degradation behavior of structural materials. We measured the acoustic nonlinearity parameter for each thermally aged specimen by the higher harmonic-generation technique. The acoustic nonlinearity parameter increased with aging time due to equilibrium M6C carbide precipitation, and has a favorable linear relation with Rockwell hardness. This study suggests that acoustic nonlinearity testing may be applicable to diagnostics on strength degradation in rotor steels.

Keywords

References

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