Method and apparatus utilizing a magnetic field for detecting de

Details Method and apparatus utilizing a magnetic field for detecting de Method and apparatus utilizing a magnetic field for detecting de

1988-09-21

1991-10-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Hysteresis loop curve display or recording

324202, 324226, 324227, 324240, 324241, 324248, 364481, 364506, 36457104, 376249, 505846, G01R 3314, G01R 33035, G01N 2772, G21C 17003

Patent

active

050599038

ABSTRACT:
On the basis of a finding that a magnetic hysteresis of a metal material, among magnetization characteristics changing with secular degradation of the metal material, shows a clear correspondence with the degree of degradation of the metal material, a change in such a magnetization characteristic is measured to estimate the degree of secular degradation of the metal material, In a typical embodiment, a superconducting quantum interference device is used to detect the magnetization characteristic of a measuring object. According to the present invention, the degree of embrittlement of a metal material used in an environment of high temperatures can be quickly detected in a non-destructive fashion so that the danger of brittle fracture of the metal material can be reliably prevented.

REFERENCES:
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patent: 4827217 (1989-05-01), Paulson
Mikheev et al, "An Instrument for Nondestructive Magnetic Testing---of Constructional and Straight Carbon Steels", Soviet Jour. of Nondestr. Testing (U.S.A.), vol. 16, No. 2 (Feb. 1980) pp. 90-93.

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