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Magneto acoustic emission apparatus for testing materials for embrittlementA 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.
Document ID
19900011854
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Allison, Sidney G. (NASA Langley Research Center Hampton, VA, United States)
Min, Namkung (NASA Langley Research Center Hampton, VA, United States)
Yost, William T. (NASA Langley Research Center Hampton, VA, United States)
Cantrell, John H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
March 27, 1990
Subject Category
Metallic Materials
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-210486
Patent Number: NASA-CASE-LAR-13817-1
Patent Number: US-PATENT-4,912,411
Accession Number
90N21170
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-LAR-13817-1|US-PATENT-4,912,411
Patent Application
US-PATENT-APPL-SN-210486

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