NDT.net - December 1998, Vol. 3 No. 12

Table of Contents ECNDT '98

Session: Steel

Determining Residual Austenite With the Eddy Current Method

C. Dybiec, A. Kozlowska
Institute of Precision Mechanics, UL. Duchnicka, 00-967 Warszawa
Deawoo FSO sp. z o.o., UL. Jagielonska, 03-215 Warszawa


Physical principles of the method

Research equipment

Calibration of devices for residual austenite control in elements after thermal processing

Results of tests of the occurrence of residual austenite in bearing steel


  1. The eddy current method may be used for controlling the share of residual austenite in the structure of quenched hyper-eutecloidal steel in the martensite.
    The application of WIROTEST 202 device with high frequency magnetic currents, will allow for simultaneous detection of parts with burns, which can occur during grinding.
  2. The elaborated method of applying elements for calibration of devices composed of the body with a nartensite structure, with elements made of austenite steel placed in it, allows to ensure calibration repeatability.
  3. Simple service of control devices, easy automation of the control process allows for extensive application in part manufacturing processes.


  1. Luty W.: Modern views on nucleation of fatigue micro-cracks in rolling bearings; MOC IMP No 6, 1973
  2. Suwalski L., Kucharski Z., Lukasik M., Luty W.:Utilised of Mossbauer spectroscopy for measuring residual austenite in bearing steel; MOC IMP No 67, 1985
  3. Wyszkowska J.: Kinetics of growth of the austenite grain; Issued by IMP 1971
  4. Hepner H., Stroppe H.:Magnetic and induction metal tests; Issued by "Slask" 1972
  5. Lampe J. : Preparing surfaces for radiological determining of residual austenite; MOC IMP No 47,1980
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