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<p>Laser powder bed fusion (LPBF) of Inconel 718 superalloy has attracted significant interest due to its widespread aerospace applications. However, the as-printed microstructure typically requires intricate and time-consuming post-processing heat treatments to achieve the desired mechanical properties. In this study, a systematic investigation was conducted to optimize the LPBF processing parameters and to evaluate the effectiveness of a simplified single-step aging treatment for achieving an outstanding strength–ductility synergy. A 4 × 4 parameter matrix was designed with laser power (from 310 to 400&#xa0;W) and scanning rate (from 950 to 1400&#xa0;mm/s). A wide processing window (laser power of 340-370&#xa0;W, scanning speed of 950-1100&#xa0;mm/s) was identified, yielding relative densities exceeding 99.95%. Using these optimized parameters, the effects of solution treatment (1150&#xa0;°C for 2&#xa0;h) followed by single-step aging at 620 (SA620) and 720&#xa0;°C were systematically evaluated. The SA620 sample exhibited an exceptional combination of mechanical properties, with a yield strength of 1168.8, an ultimate tensile strength of 1376.5&#xa0;MPa, and an elongation-to-failure of 26.5%. This superior performance is attributed to the synergistic contribution of dispersion strengthening from nano-sized, uniformly distributed Laves phases, combined with a recrystallized grain structure containing a notable fraction of annealing twins. This work provides a robust framework for the integrated optimization of LPBF processing and heat treatment, demonstrating that a simplified single-step aging approach can effectively overcome the strength–ductility trade-off in additively manufactured Inconel 718.</p>

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Strength–Ductility Synergy Achieved by Single-Step Aging in Inconel 718 by Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Enwei Qin,
  • Wenli Li,
  • Hongzhi Zhou

摘要

Laser powder bed fusion (LPBF) of Inconel 718 superalloy has attracted significant interest due to its widespread aerospace applications. However, the as-printed microstructure typically requires intricate and time-consuming post-processing heat treatments to achieve the desired mechanical properties. In this study, a systematic investigation was conducted to optimize the LPBF processing parameters and to evaluate the effectiveness of a simplified single-step aging treatment for achieving an outstanding strength–ductility synergy. A 4 × 4 parameter matrix was designed with laser power (from 310 to 400 W) and scanning rate (from 950 to 1400 mm/s). A wide processing window (laser power of 340-370 W, scanning speed of 950-1100 mm/s) was identified, yielding relative densities exceeding 99.95%. Using these optimized parameters, the effects of solution treatment (1150 °C for 2 h) followed by single-step aging at 620 (SA620) and 720 °C were systematically evaluated. The SA620 sample exhibited an exceptional combination of mechanical properties, with a yield strength of 1168.8, an ultimate tensile strength of 1376.5 MPa, and an elongation-to-failure of 26.5%. This superior performance is attributed to the synergistic contribution of dispersion strengthening from nano-sized, uniformly distributed Laves phases, combined with a recrystallized grain structure containing a notable fraction of annealing twins. This work provides a robust framework for the integrated optimization of LPBF processing and heat treatment, demonstrating that a simplified single-step aging approach can effectively overcome the strength–ductility trade-off in additively manufactured Inconel 718.