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No.1(pp.1-41)

Home > Issues > Volume 6 (2001) > No.1(pp.1-41)

Nondestructive Evaluation of Residual Life of 1Cr-1Mo-0.25V Steel from Reversible Magnetic Permeability

Journal of Magnetics, Volume 6, Number 1, 31 Mar 2001, Pages 27-30

K. S. Ryu(Div. of Electromagnetic Metrology, Korea Research Institute of Standards and Science), S. H. Nahm(Div. of Industrial Metrology, Korea Research Institute of Standards and Science), Y. I. Kim(Div. of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science), K. M. Yu(Div. of Electromagnetic Metrology, Korea Research Institute of Standards and ScienceL), Y. B. Kim(Div. of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Y. Cho(Department of Physics, Hannam University), D. Son(Department of Physics, Hannam University)

Abstract

We present a new procedure to evaluate the residual life of 1Cr-1Mo-0.25V steel from reversible magnetic permeability. The method is based on the existence of first harmonics in the differential magnetization around the coercive force. The apparatus is based on the detection of the voltage induced in a coil using a lock-in amplifier tuned to the frequency of the exciting coil. Results obtained for the first harmonics and Vickers hardness on aged samples show that the peak interval of reversible permeability and Vickers hardness decrease as aging time increases. The correlation between Vickers hardness and the peak interval of the reversible permeability may be used to evaluate the residual life of 1Cr-1Mo-0.25V steel, nondestructively.

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