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Title: Evaluation of Surface Modifications in High Strength Steel
Author: D Jiles, R Kern, W Theiner
Source: Conf Proc: ICSP-6, (p.192-206)
Publication year 1996
Document number: 1996066
Number of pages: 15
Abstract:
This paper reports on the application of micromagnetic inspection techniquies to the evaluation of the surface condition of shot peened, high stength HP9430 steel. It is
shown from the results that the modification of the surface condition resulting from different shot peening intensities can be detected from the amplitude of the
mocromagnetic signals emitted from the surface under alternating magnetic field excitation. It is further demonstrated that the productin of residual stresses in the
surface of a steel , as a result of shot peening, causes a broadening of the range of critical field stenghts for domain wall activation. consequently the spectrum of
activation fields obtained on a plot of micromagnetic activity versus magnetic field stenght can be used as an indication of the shot peened condition of the material.
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