HARDENING EVALUATION OF CARBON STEEL BY USING FREQUENCY SWEEPING EXCITATION AND SPECTROGRAM METHOD

Taisuke Matsuda – Yuji Tsuchida – Takashi Todaka – Masato Enokizono – Yuichiro Kai

   Induction heating is a very effective hardening method to improve strength of carbon steels, which are usually used as a structural material. However, the current method for testing the hardening requires time and effort. Therefore, the non-destructive evaluation of the hardening condition is desired. This paper presents a magnetic evaluation method of hardened carbon steels by using the frequency sweeping excitation and spectrogram (FSES) method.

Keywords: hardening, non destructive evaluation, magnetic properties, frequency sweeping excitation and spectrogram method

[full-paper]