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The Laser Metal Deposition (LMD) technique, a rapidly advancing additive manufacturing (AM) method, is gaining significant attention. This research focuses on the utilization of LMD for fabricating Inconel 718 alloys, vital in aerospace and automotive industries. Examining various process parameters, especially scanning speed variations within LMD, the study investigates their impact on solidified microstructures and their correlation with corrosion resistance in printed components. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) techniques analysed the microstructural and compositional features of as-printed LMD samples. Electrochemical tests in NaNO3 solution further assess corrosion mechanisms. The findings reveal dendritic morphology in LMD Inconel 718, with primary columnar grains. Alterations in scanning speed influence grain size, reducing it by approximately two times at 850 mm/min, potentially affecting corrosion resistance. The study emphasizes the role of micrograin texture and morphology in determining the corrosion behavior of the investigated samples.

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Addressing the Anisotropy Issue and Corrosion Engineering in Laser Metal Deposition of Inconel 718 Through Scanning Speed

  • 会议论文

  • 发表日期：

    2025年

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  • Ayda Shahriari,
  • Parisa Moazzen,
  • Navid Hasani,
  • Hadi Pirgazi,
  • Saeed Tamimi,
  • Mohsen Mohammadi

摘要

The Laser Metal Deposition (LMD) technique, a rapidly advancing additive manufacturing (AM) method, is gaining significant attention. This research focuses on the utilization of LMD for fabricating Inconel 718 alloys, vital in aerospace and automotive industries. Examining various process parameters, especially scanning speed variations within LMD, the study investigates their impact on solidified microstructures and their correlation with corrosion resistance in printed components. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) techniques analysed the microstructural and compositional features of as-printed LMD samples. Electrochemical tests in NaNO3 solution further assess corrosion mechanisms. The findings reveal dendritic morphology in LMD Inconel 718, with primary columnar grains. Alterations in scanning speed influence grain size, reducing it by approximately two times at 850 mm/min, potentially affecting corrosion resistance. The study emphasizes the role of micrograin texture and morphology in determining the corrosion behavior of the investigated samples.