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<p>Additively manufactured Inconel 718 sheet often exhibits microstructural heterogeneity and mechanical anisotropy. In this study, Inconel 718 sheets produced by laser powder bed fusion (LPBF) were subjected to homogenization (HOM) (1150&#xa0;°C, 1h) and solution treatment and ageing (STA) heat treatment performed below the <i>δ</i>-solvus temperature, followed by double ageing to dissolve long-chain of Laves phase. The as-printed (ASP) and the heat-treated samples were uniaxially deformed along the scanning direction (R<sub>0</sub>), transverse direction (R<sub>90</sub>), and at 45º to SD in SD-TD plane (R<sub>45</sub>) to assess the extent of anisotropy under uniaxial deformation. Further, hole expansion test investigates the formability in the printed parts under biaxial loading state. The STA condition showed the best tensile strength. However, in the terms of formability, the ASP condition stands out with the highest HER. This study demonstrates the potential of heat-treated additively manufactured Inconel 718 for sheet applications requiring high mechanical performance.</p>

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Tensile Anisotropy and Formability of Heat-Treated LPBF Inconel 718 Thin Sheets

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Pradeep Kumar Mishra,
  • Vivek Kumar Singh,
  • Bharat Chandra Routara,
  • Srikant Gollapudi

摘要

Additively manufactured Inconel 718 sheet often exhibits microstructural heterogeneity and mechanical anisotropy. In this study, Inconel 718 sheets produced by laser powder bed fusion (LPBF) were subjected to homogenization (HOM) (1150 °C, 1h) and solution treatment and ageing (STA) heat treatment performed below the δ-solvus temperature, followed by double ageing to dissolve long-chain of Laves phase. The as-printed (ASP) and the heat-treated samples were uniaxially deformed along the scanning direction (R0), transverse direction (R90), and at 45º to SD in SD-TD plane (R45) to assess the extent of anisotropy under uniaxial deformation. Further, hole expansion test investigates the formability in the printed parts under biaxial loading state. The STA condition showed the best tensile strength. However, in the terms of formability, the ASP condition stands out with the highest HER. This study demonstrates the potential of heat-treated additively manufactured Inconel 718 for sheet applications requiring high mechanical performance.