Magneto acoustic emission method for testing materials for embri

Details Magneto acoustic emission method for testing materials for embri Magneto acoustic emission method for testing materials for embri

1989-12-12

1992-04-28

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

051091950

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 umembrittled 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.

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