6533b856fe1ef96bd12b25d2

RESEARCH PRODUCT

Strain detection in non-magnetic steel by Kerr-microscopy of magnetic tracer layers

Martin JourdanMarek SmagaTilmann BeckM.m.b. KrämerH. J. ElmersMathias KläuiS. Deldar

subject

010302 applied physicsPermalloyAusteniteMaterials scienceStrain (chemistry)Magnetic domainPattern formation02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsFerromagnetismIndentation0103 physical sciencesComposite material0210 nano-technologyGalfenol

description

Abstract For many applications of steel, e.g. for the evaluation of the fatigue state of components or structures, the characterization of the microscopic strain distribution in the material is important. We present a proof-of-principle for the visualization of such strain distributions by Kerr-microscopy of ferromagnetic tracer layers on nonmagnetic steel sheets. The influence of indentation induced strain on the magnetic domain pattern of 20 nm Galfenol and Permalloy tracer layers on austenitic AISI 904L steel sheets was investigated. The obtained Kerr-microscopy images show a characteristic domain pattern in the strained regions of the steel sheets, which is consistent with a dominant magneto-elastic contribution to the domain pattern formation.

yearjournalcountryeditionlanguage
2018-11-01Journal of Magnetism and Magnetic Materials
https://doi.org/10.1016/j.jmmm.2018.05.081