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Investigating Microstructural Anisotropy and Productivity in High-Power PBF-LB/M of Inconel 718 Using Dual-Spot Beam Shaping Strategy
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DOI：10.1016/j.jmatprotec.2026.119330.png)
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Abstract
En 中文
• A process–property relationship for IN718 manufactured by PBF-LB/M is established for dual-spot beam shaping strategies, linking beam configuration, melt pool thermal behavior, and as-built microstructural characteristics. • Introducing a Y-offset prevents melt pool merging, enabling successful fabrication of volumetric parts with porosity below 0.2% (infill region). • Melt pool geometry is strongly affected by spot positioning. At a Y-offset of 0.13 mm, the melt pool becomes narrower and deeper, approaching the single Gaussian beam case. • The modified melt pool geometry reduces anisotropy, with the texture index decreasing from 7.4 to 2.1. Grain size is refined from 550 µm to 198 µm, confirming strong microstructural control via the dual-spot strategy. • As an inherent feature of the dual-spot strategy with dual-exposure tracks, the volumetric build rate increases markedly from 4.2 mm³/s to 16.4 mm³/s for samples produced using the diagonal dual (M+M) configuration with an X-offset of 0.08 mm and a Y-offset of 0.13 mm, corresponding to an improvement of approximately 390%.
Keywords:
IN718
PBF-LB/M
dual-spot beam shaping
melt pool geometry
microstructural control
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