Scholarlink

<p>Directed energy deposition (DED), a laser additive manufacturing (AM) process, has attracted a significant attention as a potential alternative to conventional manufacturing methods, due to its high deposition efficiency, flexibility, and precision. Despite these advantages, components produced by DED often face critical challenges, including residual stresses, microsegregation, and the formation of non-equilibrium phases due to rapid cooling during the AM process. These issues are particularly critical for Ni-based superalloys such as Inconel 718 (IN718), widely used in the aerospace, energy, and marine industries for their excellent high-temperature strength and corrosion resistance. The mechanical performance of IN718 primarily depends on precipitation hardening via γ' and γ'' phases. In contrast, the formation of deleterious phases, such as δ and Laves, can severely impair performance by depleting key alloying elements and increasing brittleness. Thus, heat treatments (HTs) are vital in addressing these challenges by reducing microsegregation, homogenizing elemental distribution, and promoting the precipitation of strengthening phases. Therefore, this study investigates the effects of six distinct heat-treatment routes on the microstructural evolution, hardness, tensile properties, and fracture behavior of DED IN718 samples. The relationship between microstructure and mechanical responses is analyzed and compared to a forged IN718 counterpart. The results offer valuable insights for optimizing heat-treatment strategies to improve the structural integrity and mechanical reliability of DED-fabricated IN718 components.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microstructural assessment of additive-manufactured Inconel 718 samples subjected to heat treatments for enhanced mechanical properties

  • 期刊论文

  • 发表日期：

    2025年8月5日

查看全文
  • Thiago Roberto Felisardo Cavalcante,
  • Douglas Giovanni Bon,
  • Fábio Edson Mariani,
  • Reginaldo Teixeira Coelho,
  • Jairo Alberto Muñoz,
  • Jessica Calvo Muñoz,
  • Giovani Gonçalves Ribamar,
  • João Pedro Oliveira,
  • António Manuel de Bastos Pereira,
  • Julian Arnaldo Avila Diaz

摘要

Directed energy deposition (DED), a laser additive manufacturing (AM) process, has attracted a significant attention as a potential alternative to conventional manufacturing methods, due to its high deposition efficiency, flexibility, and precision. Despite these advantages, components produced by DED often face critical challenges, including residual stresses, microsegregation, and the formation of non-equilibrium phases due to rapid cooling during the AM process. These issues are particularly critical for Ni-based superalloys such as Inconel 718 (IN718), widely used in the aerospace, energy, and marine industries for their excellent high-temperature strength and corrosion resistance. The mechanical performance of IN718 primarily depends on precipitation hardening via γ' and γ'' phases. In contrast, the formation of deleterious phases, such as δ and Laves, can severely impair performance by depleting key alloying elements and increasing brittleness. Thus, heat treatments (HTs) are vital in addressing these challenges by reducing microsegregation, homogenizing elemental distribution, and promoting the precipitation of strengthening phases. Therefore, this study investigates the effects of six distinct heat-treatment routes on the microstructural evolution, hardness, tensile properties, and fracture behavior of DED IN718 samples. The relationship between microstructure and mechanical responses is analyzed and compared to a forged IN718 counterpart. The results offer valuable insights for optimizing heat-treatment strategies to improve the structural integrity and mechanical reliability of DED-fabricated IN718 components.

Graphical abstract