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<p>Multi-laser powder bed fusion of Ti6Al4V has been examined to a limited degree compared with single-laser operation. The main difference is the overlap or stitch zones between two incident lasers. However, as there are differences observed from machine to machine, and material to material, each printer should be evaluated by printing test samples that include the stitched zone to ensure proper laser alignment calibrations and scan parameter settings. To establish a baseline of the performance of a dual laser PBF printer, samples were analyzed to characterize the microstructure, microhardness, and crystallographic orientations of the alpha phase which included the stitched zone and with three different stress relief temperatures applied. The results showed no apparent difference between the stitched zones and single-laser melted regions. The stress relief heat treatments showed the expected martensitic phase decomposition and alpha lath size increase with increase in stress relief temperature.</p>

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Microstructural Characterization of Stitched Zones in Ti6Al4V Printed via Multi-laser Powder Bed Fusion and Using Three Stress Relief Temperatures

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Rodolfo Villa,
  • Chris Billings,
  • Zahed Siddique,
  • Yingtao Liu

摘要

Multi-laser powder bed fusion of Ti6Al4V has been examined to a limited degree compared with single-laser operation. The main difference is the overlap or stitch zones between two incident lasers. However, as there are differences observed from machine to machine, and material to material, each printer should be evaluated by printing test samples that include the stitched zone to ensure proper laser alignment calibrations and scan parameter settings. To establish a baseline of the performance of a dual laser PBF printer, samples were analyzed to characterize the microstructure, microhardness, and crystallographic orientations of the alpha phase which included the stitched zone and with three different stress relief temperatures applied. The results showed no apparent difference between the stitched zones and single-laser melted regions. The stress relief heat treatments showed the expected martensitic phase decomposition and alpha lath size increase with increase in stress relief temperature.