Method for determining the hardening depth of steel

Details Method for determining the hardening depth of steel Method for determining the hardening depth of steel

2007-08-21

2007-08-21

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Stress in material measurement

C324S232000, C073S779000, C073S862690

Reexamination Certificate

active

10525457

ABSTRACT:
This publication discloses a method and arrangement for determining the hardening depth of steel or other ferromagnetic substances without breaking the object being measured. According to the invention, a varying magnetic field, which causes magnetic Barkhausen noise (MBN), is created in the measurement object with the aid of a magnetization coil13. The varying magnetic field is regulated in such a way that the maximum force of the magnetic field does not exceed the coercitive force of the unhardened part of the measurement object. The MBN caused is measured with the aid of an MBN sensor. The measured signal is filtered and Fourier transformed. The signal in the frequency range is integrated over a suitable frequency band, in order to determine the value depicting the energy of the MBN. This value correlates with the hardening depth and on the basis of this value it is thus possible to determine the hardening depth.

REFERENCES:
patent: 3697866 (1972-10-01), Kanda et al.
patent: 4881030 (1989-11-01), Stuecker et al.
patent: 5166613 (1992-11-01), Perry
patent: 3037932 (1982-04-01), None
patent: 531042 (1993-03-01), None
Dubois et al. “Evaluation of case depth on steels by Barkhausen noise measurement”, Material Science and Technology, Mar. 1995, vol. 11, pp. 264-267.

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