Magnetic Barkhausen Noise as an Alternative to Nital Etch for the Detection of Grind Temper on Gears


Magnetic Barkhausen Noise (MBN), is quantitative, repeatable, and non-destructive. Further, the MBN method is easily automated thus removing operator influence, as seen with Nital Etch, as a variable. Using a sample set of carburized spur gears ground to varying conditions of grinding burn, the MBN method is demonstrated to match or exceed the detection effectiveness of traditional Nital Etch. Residual stress depth distributions measured with x-ray diffraction and electrochemical layer removal are utilized as a quantitative verification method.
ISBN: 1-55589-570-9
Pages: 11
Authors: James Thomas, Stephen Kendrish
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