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  • Analysis of microstructural attributes of bulk martensitic steel surfaces with micrometersized grains through magneto-optical Kerr effect [Elektronski vir]
    Jovičević Klug, Patricia ...
    Within steel industry, there is a tendency to develop novel techniques that provide various measurement information necessary for material analysis within a short time with the same instrument setup. ... In recent years, development of magnetic characterization techniques arose for investigating microstructural and correlatively mechanical properties of certain steels [1]. However, these techniques provide limited flexibility in terms of surface specific measurements and defect analysis that can become an important part in quality assurance of a produced material. We present a novel perspective on this matter by utilizing magneto-optical Kerr effect (MOKE) microscopy, which has been proven to be a very powerful and versatile characterization technique [2]. The method allows investigation of magnetic domains and magnetic properties that emerge from the investigated material%s surface and allows correlation to the bulk magnetic properties of the material [3]. As such, the method allows high-resolution imaging and investigation of microstructural characteristics such as morphology of both matrix and carbide grains without using etchants that can potentially modify the microstructure and ending results. The method also allows the identification of retained austenite in martensitic steels as this phase in contrast to other matrix phases is non-magnetic. As a result, the method is highly versatile and allows investigation of steels on different aspects of its properties on a microstructural level. In this presentation, we will provide an example of such investigations on conventionally and cryogenically treated high-speed steels [4] with dominating martensitic microstructure. The presented data will provide insight into the correlation of the magnetic information to the microstructure and consequentially to the mechanical properties of such steels. The novelty of this research lies in the application of MOKE microscopy on steels that are relatively magnetically hard and have a fine grain size (under 10 %m). The utilization of MOKE microscopy for phase and microstructure investigation on such steels has until now not been performed. Additionally, such an investigation shows a high potential of integrating in-depth magnetic microstructural characterization into industrial applications. Finally, the data shows that MOKE microscopy is applicable to bulk samples of hard magnetic steels with fine microstructure.
    Vir: JEMS 2020 [Elektronski vir] (2020, E-povzetek)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2020
    Jezik - angleški
    COBISS.SI-ID - 41445891

    Povezava(-e):

    https://www.jems2020.com/index.php/program/schedule

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