Abstract
The use of magnetic Barkhausen noise (MBN) signal to non-destructively characterize the in-depth residual stress state of machined steel was investigated. The effect of the frequency of the magnetic field applied and of analysing the resulting MBN signal in different frequency bands for an in-depth residual stress characterisation is discussed. The effect of the residual stress on each of the parameters derived from the MBN signal is analysed comparing with the result of the XRD method.
Highlights
IntroductionTo accurately predict the fatigue behaviour of a steel piece (e.g. bearings, gears, screw shafts) in standard operating conditions it is important to know its surface condition
To accurately predict the fatigue behaviour of a steel piece in standard operating conditions it is important to know its surface condition
When a continuous magnetic field is applied to the material the domain walls oriented in the same direction of the magnetic field grow while the other domains are reduced
Summary
To accurately predict the fatigue behaviour of a steel piece (e.g. bearings, gears, screw shafts) in standard operating conditions it is important to know its surface condition. In materials with a positive magnetostriction, such as ferritic - pearlitic steel, the magnetic domains oriented in the same direction as a tensile stress or perpendicular to a compressive stress need less energy to grow. On the contrary, when it is applied perpendicular to the tensile stress direction or parallel to compressive stress direction the amplitude of the MBN signal decreases [3,4,5,6,7].
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