Evaluation of Surface Modifications in High Strength Steel

Jiles, David; Kern, R.; Theiner, W.A.

doi:10.1080/10589759308952804

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Suominen and Tiitto [17] compared the values of residual stress measured by X-ray diffraction (XRD) and MBN methods in various shot-peened steels. Jiles et al [18] concluded that the graph of MBN activity versus magnetic field strength gives valuable information to determine the shot-peening condition of HP9-4-30 steel. Jacob et al [19] observed that variations in the MBN measurement results are less than those of XRD measurements performed on nitrided, ground and shot-peened 32CD4 steels.…”

Section: Estimation Of Surface Residual Stresses Using the Magnetic Bmentioning

confidence: 99%

Investigating the correlation between magnetic Barkhausen noise emission and the fatigue life of shot-peened AISI 4140 steel

Çalışkan¹,

Gür²

2019

insight

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The performance of engineering components under conditions of fatigue can be improved by shot peening. The location and magnitude of the highest residual compressive stress, the depth of the compression zone and the stability of the residual stress state during cyclic loading are critical parameters for maximum utilisation of the advantageous influence of shot peening on fatigue performance. For accurate assessment of fatigue lifetime, residual stresses should be considered because they are algebraically summed with applied stresses. Therefore, the development of a non-destructive testing (NDT) method that has the ability to rapidly monitor surface residual stresses has industrial importance when verifying the achievement of the design goals of shot peening. The utilisation potential of the magnetic Barkhausen noise (MBN) technique in shot peening of ferromagnetic steels includes automated sorting of the components and measurement of surface residual stress. This study aims to establish the correlation between MBN emission and the fatigue life of shot-peened AISI 4140 steel.

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Section: Estimation Of Surface Residual Stresses Using the Magnetic Bmentioning

confidence: 99%

Investigating the correlation between magnetic Barkhausen noise emission and the fatigue life of shot-peened AISI 4140 steel

Çalışkan¹,

Gür²

2019

insight

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“…Intermittent crack movements in stressed ferromagnets can generate simultaneous magnetic and acoustic pulses [30,31]. Because of their refined stress sensitivity, these effects have been incorporated into several commercially available NDE instruments [32][33][34][35][36][37][38][39][40][41][42].…”

Section: Magnetomechanical Effectsmentioning

confidence: 99%

Piezomagnetism and fatigue

Erber

Guralnick

Desai

et al. 1997

J. Phys. D: Appl. Phys.

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Piezomagnetism refers to a change in the intrinsic magnetization of a material subjected to mechanical actions such as tension or compression. In a ferromagnet such as a mild steel these effects are easily measured: typically a stress of or 140 MPa induces a magnetic moment of the order of emu or , resulting in flux densities in the range 10 mG or T in the vicinity of the specimen. Since piezomagnetic effects are due to interactions between the mechanical and magnetic mesostructure of materials microplastic processes that alter the arrangement of the ferromagnetic domain structure affect the intensity of the associated magnetic fields. The progressive degradation of such materials under cyclic loading can therefore be tracked by following the evolution of the piezomagnetic field. Specifically, if the measurements are displayed as loci in a three-dimensional stress - strain - field (B) space, the approach to fatigue failure is paralleled by a series of conspicuous geometric transformations of these curves. Complementary information also appears in continuous-time records of B(t): these magnetograms clearly show the abrupt incidence of `infarcts' (microcracks) and the cumulation of phase shifts as the material degrades.

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Effects of surface stress on Barkhausen effect emissions: model predictions and comparison with X-ray diffraction studies

Jiles

Suominen²

1994

IEEE Trans. Magn.

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A bstract-The detection of surface stress in materials is becoming increasingly important in failure analysis. In the case of ferromagnetic steels, the Barkhausen effect provides a practical tool for surface stress evaluation. However, one of the drawbacks of the method has been the lack of an underlying model theory for use in computer simulations of these effects. In recent work a model theory has been suggested and calculations of the effects of stress on the Barkhausen signal amplitude have been made. In this paper results are presented on Barkhausen measurements taken from surface modified materials and x-ray diffraction data from the same specimens. These results show a decrease in Barkhausen signal envelope amplitude with compressive stress in the surface of the material.

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Evaluation of Surface Modifications in High Strength Steel

Cited by 4 publications

References 7 publications

Investigating the correlation between magnetic Barkhausen noise emission and the fatigue life of shot-peened AISI 4140 steel

Investigating the correlation between magnetic Barkhausen noise emission and the fatigue life of shot-peened AISI 4140 steel

Piezomagnetism and fatigue

Effects of surface stress on Barkhausen effect emissions: model predictions and comparison with X-ray diffraction studies

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