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During additive manufacturing using a laser powder bed fusion (LPBF) process, a variety of surface and structural defects are formed, which challenge this technology for critical applications. Therefore, post-processing is crucial to amplify the surface quality and mechanical properties of the metallic parts produced by the LPBF process. In this investigation, Inconel 718 test parts were produced using LPBF, which is a progressive technology for the production of nickel-based superalloy final products for aviation and aerospace applications. The combined thermo-mechanical post-treatments (hot isostatic pressing (HIP), heat treatment by homogenization and double aging, and surface plastic deformation by shop peening or ultrasonic impact peening) were utilized to enhance the surface integrity and corrosion properties of the LPBF-manufactured Inconel 718 alloy parts. The variation in microstructure and surface microrelief of LPBF IN 718 alloy with different heat treatments and surface severe plastic deformation (SPD) by shot/ultrasonic peening was compared. The heat treatment increases the corrosion resistance of the studied superalloy. Further surface SPD treatment by the shot/ultrasonic peening method heightens the corrosion resistance of superalloy owing to the accelerated formation of protective scales that were favored by the SPD-induced microrelief and nanostructure in the near-surface layers of the heat-processed samples.

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Corrosion Behavior of Laser Powder Bed Fused Inconel 718 Alloy after Hot Isostatic Pressing, Heat Treatment and Surface Peening

  • 会议论文

  • 发表日期：

    2026年

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  • Dmytro Lesyk,
  • Bohdan Mordyuk,
  • Silvia Martinez,
  • Oleksii Pedash,
  • Aitzol Lamikiz

摘要

During additive manufacturing using a laser powder bed fusion (LPBF) process, a variety of surface and structural defects are formed, which challenge this technology for critical applications. Therefore, post-processing is crucial to amplify the surface quality and mechanical properties of the metallic parts produced by the LPBF process. In this investigation, Inconel 718 test parts were produced using LPBF, which is a progressive technology for the production of nickel-based superalloy final products for aviation and aerospace applications. The combined thermo-mechanical post-treatments (hot isostatic pressing (HIP), heat treatment by homogenization and double aging, and surface plastic deformation by shop peening or ultrasonic impact peening) were utilized to enhance the surface integrity and corrosion properties of the LPBF-manufactured Inconel 718 alloy parts. The variation in microstructure and surface microrelief of LPBF IN 718 alloy with different heat treatments and surface severe plastic deformation (SPD) by shot/ultrasonic peening was compared. The heat treatment increases the corrosion resistance of the studied superalloy. Further surface SPD treatment by the shot/ultrasonic peening method heightens the corrosion resistance of superalloy owing to the accelerated formation of protective scales that were favored by the SPD-induced microrelief and nanostructure in the near-surface layers of the heat-processed samples.