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<p>Present research investigates the impact of La<sub>2</sub>O<sub>3</sub> nanoparticles interlayer addition on the microstructure, porosity, and mechanical properties of wire and arc additive manufactured ER5356 alloy walls using cold metal transfer. Two walls were fabricated, one without and one with La<sub>2</sub>O<sub>3</sub> nanoparticles, using a current of 140A, 8&#xa0;mm/sec travel speed, and pure argon gas at 20 L/min. Results showed that the introduction of La<sub>2</sub>O<sub>3</sub> nanoparticles promoted grain refinement and heterogeneous nucleation, leading to a finer grain structure. EDS mapping confirmed the uniform incorporation of La<sub>2</sub>O<sub>3</sub> in the alloy matrix. The wall with La<sub>2</sub>O<sub>3</sub> showed a 68.83% reduction in porosity, lowering it from 2.923 to 0.911%. Mechanical properties enhanced significantly, with an increase of 19.87% and 16.41% in microhardness, 15.59% and 13.93% in tensile strength, and 40.09% and 38.42% in elongation in the horizontal and vertical directions, respectively.</p>

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Effect of Interlayer Addition of La2O3 Nanoparticles on the Performance of ER5356 Alloy Wall Fabricated by Wire-Arc Directed Energy Deposition

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Soni Kesarwani,
  • Vibhu Singh,
  • Narayana Yuvaraj

摘要

Present research investigates the impact of La2O3 nanoparticles interlayer addition on the microstructure, porosity, and mechanical properties of wire and arc additive manufactured ER5356 alloy walls using cold metal transfer. Two walls were fabricated, one without and one with La2O3 nanoparticles, using a current of 140A, 8 mm/sec travel speed, and pure argon gas at 20 L/min. Results showed that the introduction of La2O3 nanoparticles promoted grain refinement and heterogeneous nucleation, leading to a finer grain structure. EDS mapping confirmed the uniform incorporation of La2O3 in the alloy matrix. The wall with La2O3 showed a 68.83% reduction in porosity, lowering it from 2.923 to 0.911%. Mechanical properties enhanced significantly, with an increase of 19.87% and 16.41% in microhardness, 15.59% and 13.93% in tensile strength, and 40.09% and 38.42% in elongation in the horizontal and vertical directions, respectively.