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Subject: search.filters.subject.additive manufacturing

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    Precipitation Hardening of the Additive-Manufactured 17-4 PH Stainless Steel for Medical Applications
    (2026-01-01)
    Wittayawongsaruji, Chonnakan
    ;
    Vissanuyothin, Pichanan
    ;
    Jintawattanagul, Athicha
    ;
    Methabut, Wathit
    ;
    Jintawattanagul, Siraphat
    This study explores the impact of heat treatment parameters on the hardness and microstructure of 17-4PH stainless steel samples fabricated by additive manufacturing, with a focus on dimensional changes throughout the process. The additive manufacturing method used was Bound Metal Deposition (BMD), which includes digital scanning, 3D metal printing, sintering, and post-processing. It was observed that the printed parts undergo a substantial size increase 16.96% (height) and 18.14% (diameter) to compensate for material loss during the binder removal stage in sintering. Although the sintered parts shrink relative to the printed samples, they remain 3.25% taller and 6.05% wider than the original CAD dimensions. Following sintering, the samples underwent solution treatment and aging at various temperatures and times. Microstructural analysis post-solution treatment revealed a martensitic structure as the predominant phase. Aging caused the formation of strengthening precipitates, leading to peak hardness values of 422.0 and 303.0 HV0.5 at aging temperatures of 480 °C and 620 °C for 1 hour, respectively. Dimensional changes during the precipitation hardening stage were minimal and considered negligible.
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    The Study of the Effect of Multilayer MXene Incorporation on the Properties of Polyacrylate Composites Fabricated by Stereolithography
    (2026-01-01)
    Anurakparadorn, Kanat
    ;
    Sukpimai, Kamtorn
    This study explores the incorporation of multilayer Ti3C2Tx MXene into a polyacrylate-based photocurable resin for stereolithography (SLA). Composites with 3–10 wt% MXene were fabricated and characterized for microstructure, electrical, mechanical, and dimensional accuracy. SEM and XRD confirmed successful MXene formation with partial agglomeration. Electrical conductivity improved up to 8 wt% loading but declined at 10 wt% due to filler aggregation. Mechanical testing showed reduced strength and stiffness but increased ductility with higher MXene content. Optical microscopy revealed high printing resolution, with ~3% error at the top surfaces and ~13% at the bottom. These results demonstrate the feasibility of SLA-printed MXene composites while highlighting the need for optimized dispersion to balance performance.
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    Points using Localized Distance for Contour Generation from Point Cloud for 3D Printing
    (2021-01-01)
    Moodleah, Samart
    ;
    Kirimasthong, Khwunta
    We present a robust and simple method to select the most correlated points (in each layer) for layered contour generation from a 3D point cloud model in additive manufacturing. The contour projection of each layer point uses a planar least square projection technique. One critical step in contour projection is that the correlation between each projection point and other points (weights) on a slicing plane directly affects to the contour generation accuracy. The constructing contour from point cloud directly is a challenging task because there is no information of mesh topology, hence, no sequential order of points for contour generation. A search algorithm to find the most correlated points from skeletal points (reference) using the localized distance function is implemented. The experiment results show that our method reduces an average accuracy error for both wide and narrow point distributions by 15.57% to 35.20% and 4.28% to 12.78% respectively compared to the existina method.