Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Degradation Evaluation of Turbine Rotor Using Magnetic Method

자기적 방법에 의한 터빈 로터강의 열화도 평가

  • Ryu, K.S. (Div. of Electromagnetic Metrology, KRISS) ;
  • Park, J.S. (Manufacturing Team, Samsung Electronics) ;
  • Nahm, S.H. (Div. of Industrial Metrology, KRISS) ;
  • Kim, Y.I. (Div. of Chemical Metrology and Material Evaluation, KRISS) ;
  • Yu, K.M. (Div. of Electromagnetic Metrology, KRISS) ;
  • Ryu, J.C. (Div. of Electromagnetic Metrology, KRISS)
  • 유권상 (한국표준과학원 전자기부) ;
  • 박진습 (삼성전자 생산기술팀) ;
  • 남승훈 (한국표준과학원 산업측정부) ;
  • 김용일 (한국표준과학원 물질량부) ;
  • 유광민 (한국표준과학원 전자기부) ;
  • 류제천 (한국표준과학원 전자기부)
  • Published : 2000.07.17
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Abstract

We present a new procedure to evaluate the degradation in a lCr-lMo-0.25V steel. The method is based on the existence of the peak of reversible permeability in the differential magnetization around the coercive field strength. The apparatus is based on the detection of the voltage induced in a surface type coil using a lock-in amplifier tuned to a frequency to the exciting one. Results obtained the reversible permeability and Vickers hardness on the annealed samples show the peak interval of reversible permeability and Vickers hardness decreased as ageing time increased. The correlation between Vickers hardness and the peak interval of reversible permeability could well be evaluated non destructively.

Keywords