Evaluation of Residual Stresses in Grinding by Magnetic Barkhausen Noise
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Abstract
The effect of residual stresses and the lubricant
type in grinding on the characteristics of magnetic
Barkhausen noise (MBN) profiles were examined in low
alloy steel of the type used for wear-resistant engineering
components. A shotpeened and ground in different
conditions specimens were tested. MBN measurements
showed that the intensity of the signal increases with abusive
grinding due to residual tensile stresses and decreases with
shot peening due to residual compressive stresses. An
increase was seen in wet grinding specimens as compared
with the heat-treated specimen. The increase in MBN after
grinding was due to local heating with transition from the
initial stage of strong martensitic structure, with residual
stress of compression, to the following stage of lower
hardening with tendency to residual stress of tensile
character. In addition, Barkhausen signals from surfaces
ground under controlled conditions were found to be
dependent on the lubricant type. The decrease in MBN
after shotpeening was due to the accumulation of residual
compressive stresses introduced to the martensitic structure.
The observations are discussed in the light of established
models of Barkhausen noise.
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