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Characterization of the magnetic micro- and nanostructure in unalloyed steels by magnetic force microscopy

: Batista, Leonardo; Rabe, Ute; Hirsekorn, Sigrun


Thompson, D.O. ; American Institute of Physics -AIP-, New York:
Review of progress in quantitative nondestructive evaluation. Vol.32B : 39th annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE); Denver, Colorado, USA, 15-20 July 2012
Meville/N.Y.: AIP, 2013 (AIP Conference Proceedings 1511)
ISBN: 978-0-7354-1129-6 (Set)
ISBN: 978-0-7354-1131-9 (Volume B)
ISBN: 978-0-7354-1130-2 (Volume A)
ISBN: 978-0-7354-1132-6 (CD-ROM)
ISSN: 0094-243X
Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) <39, 2012, Denver/Colo.>
Conference Paper
Fraunhofer IZFP ()
Atomic Force Microscopy (AFM); magnetic force microscopy (MFM); Electron Backscattering Diffraction (EBSD); steel; microstructure; nanostructure; magnetic domains; non-destructive testing

The formation of a cementite phase influences significantly the macroscopic mechanical and magnetic properties of steels. Based on a correlation between mechanical and magnetic properties, mechanical properties as well as the morphology and content of the cementite phase can be inspected by electromagnetic non-destructive testing methods. The influence of the carbon content on bulk magnetic properties of unalloyed steels is studied on a macroscopic scale by hysteresis loop and Barkhausen noise measurements. The micro- and nanostructure is investigated by atomic force microscopy and magnetic force microscopy. Surface topography images and magnetic images of globular cementite precipitates embedded in a ferrite matrix are presented. The size, shape, and orientation of the precipitates influence the domain configuration. Applied external magnetic fields cause magnetization processes mainly in the ferrite matrix: Bloch walls move and are pinned by the cementite precipitates. The correlation between the microscopic observations and macroscopic magnetic properties of the material is discussed.