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<p>Aeronautic sector demands materials with excellent mechanical, oxidation, creep and wear properties at room and at high temperatures. CM247LC material, which is a precipitation strengthened nickel-based superalloy meets these requirements and it is used on this sector. However, it shows a cracking issue during Powder Bed Fusion- Laser Beam (PBF-LB) processing due to the material complex chemistry and high cooling rates of the process. This study analyses the processing by PBF-LB of four batches of CM247LC powders with different compositions. Process modification, including modification of the laser scanning strategies, and Hot Isostatic Pressing (HIP) post-processing were applied approaches to mitigate crack susceptibility of the alloy to enable its processing by PBF-LB. Composition influence on cracking susceptibility was assessed. Microstructure before and after heat treatments and HIPping, was also evaluated and cracking mechanism was studied in the light of microstructural observations.</p>

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Assessment of the cracking susceptibility of CM247LC alloy processed by PBF-LB: composition and process parameters influence

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Emma Gil,
  • Raúl Gómez,
  • Fermin Garciandia,
  • Maria San Sebastian,
  • Ane Miren Mancisidor

摘要

Aeronautic sector demands materials with excellent mechanical, oxidation, creep and wear properties at room and at high temperatures. CM247LC material, which is a precipitation strengthened nickel-based superalloy meets these requirements and it is used on this sector. However, it shows a cracking issue during Powder Bed Fusion- Laser Beam (PBF-LB) processing due to the material complex chemistry and high cooling rates of the process. This study analyses the processing by PBF-LB of four batches of CM247LC powders with different compositions. Process modification, including modification of the laser scanning strategies, and Hot Isostatic Pressing (HIP) post-processing were applied approaches to mitigate crack susceptibility of the alloy to enable its processing by PBF-LB. Composition influence on cracking susceptibility was assessed. Microstructure before and after heat treatments and HIPping, was also evaluated and cracking mechanism was studied in the light of microstructural observations.