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  Serrano-Munoz, I.; Pfretzschner, B.; Kromm, A.; Nadammal, N.; Kardjilov, N.; Markötter, H.; Neuwirth, T.; Schulz, M.; Griesche, A.: High-resolution Bragg-edge neutron radiography detects grain morphology in PBF-LB/M IN718. Materialia 30 (2023), p. 101827/1-6

10.1016/j.mtla.2023.101827

Abstract:
One of the main advantages of metal additive manufacturing (MAM) techniques is their ability to produce components with site-specific microstructural features. Nevertheless, microstructural defects and lack of repeatability are still major concerns in MAM. In this study, a laser powder bed fusion (PBF-LB/M) IN718 material, produced using two different scan length vectors, is investigated using Bragg-edge neutron 2D imaging (BENI) combined with electron backscatter diffraction (EBSD) analysis. BENI is able to detect, on a macroscopic scale, process-induced changes in texture in a large field of view covering the entire sample (20×80 mm2). In addition, high-resolution BENI (HR-BENI), with a pixel size of 12.8 µm, provides a micro-scale examination of the local variations of texture and grain morphology, otherwise undistinguishable using the standard resolution. As such, HR-BENI offers a straightforward and detailed way of screening the integrity of MAM parts at cm-length scales.