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<p>Molybdenum (Mo) is comparable in weight, has higher thermal conductivity, costs less, and can sustain higher mechanical loads at high temperatures than niobium, motivating the development of additive manufacturing (AM) of Mo structural components as complements and/or replacements to niobium-base refractory alloys for high-temperature applications. Toward enabling AM of Mo components an investigation of directed energy deposition AM using a laser beam energy source and blown powder feeding (DED-LB-BP) was performed. Mo powders mixed with La<sub>2</sub>O<sub>3</sub> ceramic particles were printed and showed grain refinement compared to pure Mo depositions. Pure Mo samples exhibited grains that grew several millimeters, significant porosity, and intergranular cracking. Additions of 0.7–3.5&#xa0;wt.% La<sub>2</sub>O<sub>3</sub> particles result in printed densities greater than 99% corresponding with 100- to 300-µm-sized grains, limited porosity, and reduced cracking. Furthermore, previous work suggested that laser powers greater than 4500&#xa0;W may be required for DED-LB-BP of Mo; in this work, materials were fabricated and improved using laser powers less than 2000&#xa0;W.</p>

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Improvement of Powder Blown Laser Beam-Directed Energy Deposition of Molybdenum Using Lanthanum Oxide Additions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月10日

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  • Michael Pagan,
  • Andrew Hutchinson,
  • Nathaniel J. Lies,
  • Aaron P. Stebner

摘要

Molybdenum (Mo) is comparable in weight, has higher thermal conductivity, costs less, and can sustain higher mechanical loads at high temperatures than niobium, motivating the development of additive manufacturing (AM) of Mo structural components as complements and/or replacements to niobium-base refractory alloys for high-temperature applications. Toward enabling AM of Mo components an investigation of directed energy deposition AM using a laser beam energy source and blown powder feeding (DED-LB-BP) was performed. Mo powders mixed with La2O3 ceramic particles were printed and showed grain refinement compared to pure Mo depositions. Pure Mo samples exhibited grains that grew several millimeters, significant porosity, and intergranular cracking. Additions of 0.7–3.5 wt.% La2O3 particles result in printed densities greater than 99% corresponding with 100- to 300-µm-sized grains, limited porosity, and reduced cracking. Furthermore, previous work suggested that laser powers greater than 4500 W may be required for DED-LB-BP of Mo; in this work, materials were fabricated and improved using laser powers less than 2000 W.