Micromagnetic Analysis of Residual Stress Distribution in 42CrMo4 Steel after Thermal and Mechanical Surface Treatment

Micromagnetic Analysis of Residual Stress Distribution in 42CrMo4 Steel after Thermal and Mechanical Surface Treatment

I. Bobrov, J. Epp, H.-W. Zoch

download PDF

Abstract. In this study, residual stresses and micromagnetic parameters were analyzed with a Barkhausen-Noise-Eddy-Current-Microscope which allows the analysis of local micromagnetic properties with high resolution down to 20 µm. 42CrMo4 steel samples with varying initial microstructure and subjected to different thermal and mechanical surface treatments were investigated. In particular, shot peening and induction hardening were used to generate different distributions of microstructural and residual stress modifications. Calibration strategies were developed using standard methods as X-ray diffraction measurements and metallographic examinations. The results show that a quantitative evaluation of residual stress distribution can be possible, even in regions with high gradients when proper measurement and calibration strategy is used. With this method, large areas with thousands of measurement positions can be analyzed very fast and thus open new possibilities in the investigation of local residual stress distribution of components.

Residual Stresses, Micromagnetic, X-Ray Diffraction, Barkhausen Noise

Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: I. Bobrov, J. Epp, H.-W. Zoch, ‘Micromagnetic Analysis of Residual Stress Distribution in 42CrMo4 Steel after Thermal and Mechanical Surface Treatment’, Materials Research Proceedings, Vol. 6, pp 109-114, 2018

DOI: http://dx.doi.org/10.21741/9781945291890-18

The article was published as article 18 of the book Residual Stresses 2018

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

[1] Schulze, Volker. Modern mechanical surface treatment: states, stability, effects. John Wiley & Sons, 2006.
[2] J. Epp, XRD methods for materials Characterization in Material Characterization Using Nondestructive Evaluation (NDE) Methods, Woodhead publishing pp. 81–124 (2016) https://doi.org/10.1016/B978-0-08-100040-3.00004-3
[3] Blitz, Jack. Electrical and magnetic methods of non-destructive testing. Vol. 3. Springer Science & Business Media, 2012.
[4] J. Epp, T. Hirsch: Residual Stress State Characterization of Machined Components by X-ray Diffraction and Multiparameter Micromagnetic Methods, Experimental Mechanics 50 (2010) 1, 195-204
[5] I. Altpeter, et al., Electromagnetic and Micro-Magnetic Non-Destructive Characterization (NDC) for Material Mechanical Property Determination and Prediction in Steel Industry and in Lifetime Extension Strategies of NPP Steel Components, Inverse Problems, 18 (2002) 1907 -1921. https://doi.org/10.1088/0266-5611/18/6/328
[6] K. Szielasko, et al., Ortsauflösende Charakterisierung ferro- und ferrimagnetischer Schichten für magneto-resistive und magnetooptische Sensoren. GZfP-Jahrestagung 2014 – Di.1.B.4
[7] M. Abuhamad, I. Altpeter, G. Dobmann, M. Kopp, Non-destructive characterization of cast iron gradient combustion engine cylinder crankcase by electromagnetic techniques (in German), Proceedings of the DGZfP-Annual Assembly (2007), Fürth
[8] B.Wolter, G. Dobmann, Micromagnetic Testing for Rolled Steel, European Conference on Non-destructive Testing (9) (2006) Th. 3.7.1, 25.-29. 09. 2006, Berlin.
[9] Noyan, Ismail C., and Jerome B. Cohen. Residual stress: measurement by diffraction and interpretation. Springer, 2013.
[10] Bender, J., D. O. Thompson, and D. E. Chimenti. “Barkhausen Noise and Eddy Current Microscopy (BEMI): Microscope Configuration, Probes and Imaging Characteristics in ‘Review of Progress in Quantitative Nondestructive Evaluation.” (1997): 212Iff.
[11] Stewart, D. M., K. J. Stevens, and A. B. Kaiser. “Magnetic Barkhausen noise analysis of stress in steel.” Current Applied Physics 4.2-4 (2004): 308-311.