Barkhausen noise-magnetizing voltage sweep measurement in evaluation of residual stress in hardened components

Abstract

In this study, Barkhausen noise (BN) magnetizing voltage sweep (MVS) measurement is used to evaluate non-destructively the surface residual stress state of hardened components. A new computational feature, where the maximum slope of the sweep is divided by the corresponding magnetizing voltage, is introduced. The results show that this feature has a linear relationship with the residual stress state of the samples. The determination of residual stresses during online production of components is a highly recognized task because tensile stresses may be detrimental to the component. In this study, two sets of hardened samples are used in the analysis. A linear relationship is observed in each sample set indicating that the new feature is applicable in assessment of surface residual stresses of the components.

Destructive and non-destructive testing methods for characterization and detection of machining-induced white layer: A review paper

“…Magnetizing voltage sweeps have also been used for residual stress evaluation (Santa-aho et al, 2014b). For these sweeps, the maximum slope of the magnetizing voltage sweep divided by the magnetizing voltage was seen to correlate linearly with tensile stress, a closer relationship than that which has been measured (Vrkoslavová et al, 2014) for the RMS of the BN signal.…”

“…The most widely researched application of BN inspection is in verification of case-hardening depth in steels (Santa-aho et al, 2012, Dubois andFiset, 1995). The technique has also been used for detection of grinding burn, a thermal defect (Karpuschewski et al, 2011) as well as for determination of residual stresses (Santa-aho et al, 2014b). More recently the technique has been specifically applied to detection of a white layer formed in milled steel N al., , Stupakov et al, 2016, wherein increased tool wear during machining resulted in the appearance of a second peak in the BN envelope formed at different magnetic field strengths.…”

A fast procedure of stress state evaluation in magnetically anisotropic steels with the help of a probe with adjustable magnetizing field direction

“…The results obtained for each point on the plate were then normalized according to the procedure described earlier. The results of the BE intensity measurements for the chosen point ( [1,3]) obtained after welding are presented in figure 8 (plot 2).…”

“…The σ 1 and σ 2 vectors are naturally (since they represent main stresses) perpendicular to each other, and the angle α (according to the convention used while calculating table 2 data) is calculated clockwise in respect to the Y axis. Taking as an example the analysed point [1,3] we have close to the half of the spatial unit vector representing σ 1 component (+115 MPa) starting at the measured location, oriented almost parallel to the seam (−87° in respect to Y axis). As for the vector representing σ 2 it has length of one eights (25 MPa), starts at the analysed point, and is perpendicular to σ 1 .…”

Case Depth Prediction of Nitrided Samples with Barkhausen Noise Measurement

“…When these values are determined from sweeps carried out with low (20 Hz) and high (125 Hz) magnetisation frequencies, the ratio of slopes has a linear relationship with case depth [10]. The slope positions have also been noticed to hold information about the residual stress state of the material [11]. Even though a linear relationship was observed in [10], the authors also noticed that the relationship depended on surface hardness.…”