Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1988-06-23
1990-03-27
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
73801, 324209, 324226, 324227, 324239, G01R 3312, G01N 2780
Patent
active
049124110
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.
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Ono et al; Magnetomechanical Acoustic Emission of Iron and Steels, Materials Evaluation/Jan. 1980, pp. 55-61.
Allison Sidney G.
Cantrell John H.
Namkung Min
Yost William T.
Adams Harold W.
Glenn Charles E. B.
Manning John R.
Strecker Gerard R.
The United States of America as represented by the Administrator
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