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Eddy current characterization of magnetic treatment of materialsEddy current impedance measuring methods have been applied to study the effect that magnetically treated materials have on service life extension. Eddy current impedance measurements have been performed on Nickel 200 specimens that have been subjected to many mechanical and magnetic engineering processes: annealing, applied strain, magnetic field, shot peening, and magnetic field after peening. Experimental results have demonstrated a functional relationship between coil impedance, resistance and reactance, and specimens subjected to various engineering processes. It has shown that magnetic treatment does induce changes in a material's electromagnetic properties and does exhibit evidence of stress relief. However, further fundamental studies are necessary for a thorough understanding of the exact mechanism of the magnetic-field processing effect on machine tool service life.
Document ID
19930002433
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Chern, E. James
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1992
Subject Category
Metallic Materials
Report/Patent Number
REPT-92E02736
NASA-TM-104573
NAS 1.15:104573
Accession Number
93N11621
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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