Magnetic remanence method and apparatus to test materials for em

Details Magnetic remanence method and apparatus to test materials for em Magnetic remanence method and apparatus to test materials for em

1990-11-02

1992-05-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01R 3312, G01R 2772

Patent

active

051171848

ABSTRACT:
A method and apparatus for testing steel components for temper embrittlement uses magneto-acoustic emission to nondestructively evaluate the component. Acoustic emission signals occur more frequently at higher levels in embrittled components. A pair of electromagnets are used to create magnetic induction in the test component. Magneto-acoustic emission signals may be generated by applying an AC current to the electromagnets. The acoustic emission signals are analyzed to provide a comparison between a component known to be unembrittled and a test component. Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.

REFERENCES:
patent: 3265964 (1966-08-01), Hunsaker
patent: 4363242 (1982-12-01), Heyman
patent: 4692701 (1987-09-01), Dundas et al.
patent: 4931730 (1990-06-01), Olsen et al.
patent: 4987367 (1991-01-01), Ishikawa et al.
M. Namkung; D. Utrata; J. S. Heyman; and S. G. Allison, "Low Field Magneto-Acoustic Residual Stress Measurement in Steel", presented at the Solid Mechanics Research for QNDE, Northwestern University, Evanston, Ill.; Sep. 18-20, 1985.

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