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<p>This study evaluates the potential of Metal Fused Granulate Fabrication (MFGF) for manufacturing metallic components using two commercial 316&#xa0;L stainless steel-based feedstocks (Ecrimesa and PolyMIM). Both materials were printed in pellet form and sintered to obtain dense metal parts. Dimensional measurements confirmed good geometric fidelity, while surface roughness analysis showed higher R<sub>a</sub> and R<sub>q</sub> values in PolyMIM due to material composition and deposition behavior. X-ray diffraction (XRD) revealed predominantly austenitic structures with minor ferrite presence. Energy Dispersive X-Ray (EDS) and Electron Backscatter Diffraction (EBSD) confirmed homogeneous elemental distribution and microstructural integrity. Rheological characterization showed shear-thinning behavior, well described by the power law model. EBSD analysis further indicated differences in grain size and crystallographic texture between the two feedstocks. Tensile tests in 0°, 45°, and 90° orientations revealed anisotropic mechanical behavior, with Ecrimesa samples reaching up to 689&#xa0;MPa in ultimate tensile strength. Fractographic analysis showed ductile fracture with void formation and coalescence. The novelty of this work lies in the combined multi-scale characterization of pellet-based metal extrusion feedstocks, linking rheology, microstructure, and mechanical anisotropy, while explicitly revealing geometry-dependent debinding effects relevant to the fabrication of functional spare parts by MFGF.</p>

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Multi-scale analysis of sintered 316 L-PLA/PEG components produced by metal fused granulate fabrication for automotive spare part applications

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Mohammad Rezayat,
  • Miguel Grande,
  • Laura Calvo,
  • Andrea Serrano,
  • Xavier Garcia Montolio,
  • Jessica Calvo,
  • Felip Fenollosa-Artés

摘要

This study evaluates the potential of Metal Fused Granulate Fabrication (MFGF) for manufacturing metallic components using two commercial 316 L stainless steel-based feedstocks (Ecrimesa and PolyMIM). Both materials were printed in pellet form and sintered to obtain dense metal parts. Dimensional measurements confirmed good geometric fidelity, while surface roughness analysis showed higher Ra and Rq values in PolyMIM due to material composition and deposition behavior. X-ray diffraction (XRD) revealed predominantly austenitic structures with minor ferrite presence. Energy Dispersive X-Ray (EDS) and Electron Backscatter Diffraction (EBSD) confirmed homogeneous elemental distribution and microstructural integrity. Rheological characterization showed shear-thinning behavior, well described by the power law model. EBSD analysis further indicated differences in grain size and crystallographic texture between the two feedstocks. Tensile tests in 0°, 45°, and 90° orientations revealed anisotropic mechanical behavior, with Ecrimesa samples reaching up to 689 MPa in ultimate tensile strength. Fractographic analysis showed ductile fracture with void formation and coalescence. The novelty of this work lies in the combined multi-scale characterization of pellet-based metal extrusion feedstocks, linking rheology, microstructure, and mechanical anisotropy, while explicitly revealing geometry-dependent debinding effects relevant to the fabrication of functional spare parts by MFGF.