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  4. Micromagnetic and Microstructural Characterization of Ferromagnetic Steels in Different Heat Treatment Conditions
 
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2022
Journal Article
Title

Micromagnetic and Microstructural Characterization of Ferromagnetic Steels in Different Heat Treatment Conditions

Abstract
The paper addresses the investigation of microstructures from AISI 52100 and AISI 4140 in hardened as well as in quenched and tempered conditions. The specimens are compared in terms of their magnetic hysteresis and their microstructural and mechanical properties. Material properties were determined by hardness, microhardness, and X-ray diffraction measurements. Two different approaches were used to characterize magnetic properties via a hysteresis frame device, aiming, on the one hand, to record the magnetic hysteresis with established proceedings by setting a constant magnetic flux and, on the other hand, by offsetting a constant field strength to facilitate reproducibility of the results with other micromagnetic measurement systems. Comparable differences in both the micromagnetic and the mechanical material properties could be determined and quantified for the specifically manufactured specimens. The sensitivity of the magnetic hysteresis and, determined from that, the relationship between magnetic flux and magnetic field strength were confirmed. It was shown that a consistent change in hysteresis shape from hardened to high temperature tempered material states develops and that this change allows the characterization of different materials without the need to adjust magnetization parameters. Repeatedly, an increase in remanence with decreasing hardness was found for both test approaches. Likewise, a decreasing coercivity and increasing maximum magnetic flux could be detected with decreasing retained austenite content. The investigated correlations should thus contribute to the calibration of comparable measurement systems through the holistic characterized specimens.
Author(s)
Ankener, Werner
Institute of Materials Science and Engineering, TU Kaiserslautern
Böttger, David  
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Smaga, Marek
Institute of Materials Science and Engineering, TU Kaiserslautern
Gabi, Yasmine  
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Straß, Benjamin  
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Wolter, Bernd  
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Beck, Tilmann
Institute of Materials Science and Engineering, TU Kaiserslautern
Journal
Sensors. Online journal  
Project(s)
Prozessintegrierte Softsensorik zur Oberflächenkonditionierung beim Außenlängsdrehen von 42CrMo4  
Funder
Deutsche Forschungsgemeinschaft -DFG-, Bonn  
Open Access
File(s)
Download (4.07 MB)
Rights
CC BY
DOI
10.24406/publica-r-418356
10.3390/s22124428
Language
English
Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP  
Keyword(s)
  • microstructure

  • hardness

  • X-Ray Diffraction

  • magneto-mechanical correlation

  • 3MA

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