3D characterization of magnetic phases through neutron polarization contrast tomography

• DOI: 10.1016/j.addlet.2023.100155
• Publication Date: 2023-06-03T15:56:54Z
• Authors: Matteo Busi; Efthymios Polatidis; Stavros Samothrak...; Patrick Köhnen; Florencia Malamud; Christian Haase; Markus Strobl
• Keywords: Characterization

The advancement of laser-based metal additive manufacturing has enabled the production near net shape complex geometries. Understanding microstructural features materials is crucial for accurate modeling their mechanical behavior, particularly with regard to strain- or thermal-induced martensitic phase transformations in ferrous alloys and steels. For example, formation BCC α′-martensite can strengthen while preserving ductility dominating austenitic phase. However, components where memory effect attributed reversible ε-martensite, accumulation deformation-induced an undesired, irreversible degradation mechanism. This study presents a novel tomographic approach utilizing polarization contrast neutron imaging 3D volumetric characterization magnetic crystallographic phases, especially those present low fractions that are typically undetectable traditional techniques. technique applied strain-induced additively manufactured lattice structures made high-Mn steels, which form small upon deformation. results demonstrate value this characterizing entire geometries found numerous technological applications.