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<p>Iron aluminide powders obtained by the method of plasma-arc spraying of a&#xa0;flux-cored conductive wire with a&#xa0;steel shell and aluminum filler were investigated. The experiments were carried out in an argon environment on the “PLAZAR-50-PL-W” installation. In all operation modes of the plasma torch, the sprayed particles are mostly spherical. The number of non-spherical particles is 7–12% in powders of the −315 + 200 μm fraction, and in smaller fractions, it is equal to 4–5%. The main phases of the obtained materials are Fe<sub>3</sub>Al and FeAl iron aluminides in various ratios. In all powder fractions, the amount of the metal component is greater than that of the oxide component. The amount of oxides increases with a&#xa0;decrease in the powder fraction and a&#xa0;decrease in the plasma torch current. Under spraying at a&#xa0;current of 220 and 270 A in the powder fraction −200 + 100 μm, a&#xa0;greater amount of aluminides (83.88 and 86.30) and the lowest content of oxides (up to 10–18%) was recorded. In smaller powder fractions, the content of aluminides is 70.38–75.68, and the amount of the oxide component increases to 29.62 wt%. The microhardness of the metal particles is 3.07–4.59 GPa. Oxide particles consist mainly of Fe<sub>3</sub>O<sub>4</sub> and Fe<sub>2</sub>O<sub>3</sub> iron oxides and have a&#xa0;higher microhardness of 5.32–8.15 GPa under all spraying modes. The obtained powders can be recommended in 3D production for the direct energy deposition method, which includes laser deposition processes (DMD—Direct Metal Deposition). These materials can be used in the production of precise workpieces with a&#xa0;minimum allowance for mechanical processing using compaction methods in granular metallurgy—hot isostatic pressing (HIP).</p>

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Peculiarities of the microstructure and properties of iron aluminide powders obtained by the method of plasma-arc spheroidization

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • L. I. Adeeva,
  • A. Yu. Tunik,
  • V. M. Korzhyk,
  • D. V. Strohonov,
  • V. A. Kostin,
  • O. V. Konoreva

摘要

Iron aluminide powders obtained by the method of plasma-arc spraying of a flux-cored conductive wire with a steel shell and aluminum filler were investigated. The experiments were carried out in an argon environment on the “PLAZAR-50-PL-W” installation. In all operation modes of the plasma torch, the sprayed particles are mostly spherical. The number of non-spherical particles is 7–12% in powders of the −315 + 200 μm fraction, and in smaller fractions, it is equal to 4–5%. The main phases of the obtained materials are Fe3Al and FeAl iron aluminides in various ratios. In all powder fractions, the amount of the metal component is greater than that of the oxide component. The amount of oxides increases with a decrease in the powder fraction and a decrease in the plasma torch current. Under spraying at a current of 220 and 270 A in the powder fraction −200 + 100 μm, a greater amount of aluminides (83.88 and 86.30) and the lowest content of oxides (up to 10–18%) was recorded. In smaller powder fractions, the content of aluminides is 70.38–75.68, and the amount of the oxide component increases to 29.62 wt%. The microhardness of the metal particles is 3.07–4.59 GPa. Oxide particles consist mainly of Fe3O4 and Fe2O3 iron oxides and have a higher microhardness of 5.32–8.15 GPa under all spraying modes. The obtained powders can be recommended in 3D production for the direct energy deposition method, which includes laser deposition processes (DMD—Direct Metal Deposition). These materials can be used in the production of precise workpieces with a minimum allowance for mechanical processing using compaction methods in granular metallurgy—hot isostatic pressing (HIP).