Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Nondestructive Measurement of Case Hardening Depth with Eddy Current Method

와전류법을 이용한 강의 표면경화층 깊이의 비파괴적 측정

  • 이계완 (한양대학교 금속공학과) ;
  • 한승룡 (한양대학교 금속공학과) ;
  • 박은수 (서울산업대학 재료공학과)
  • Published : 1991.05.24
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Abstract

The relationship between eddy current response and case hardening depth has been studied on SM40C(KS D-3752) and SCM440(KS D-3711) steels which were surface hardened by high frequency induction hardening. The results obtained in this study were as follows ; 1) Case hardening depth was successfully measured by observing the eddy current impedance changes of each steel. The impedance decreased linearly with increasing case hardening depth. 2) For large impedance gradient between the hardened surface and core metal, the eddy current response was more sensitive to case hardening depth than for low impedance gradient.

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