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<p>Attaining the desired mechanical characteristics in materials often requires post-fabrication heat treatments, primarily for stress relief and, at times, to enhance strength. This research focused on optimizing post-fabrication heat treatments for precipitation-hardened 17-4 PH stainless steel, essential for maximizing hardness. The unique microstructure and composition of the L-PBF process necessitate tailored heat treatments rather than the conventional H900 treatment. A plate of samples was built and subjected to various heat treatments. Dilatometric measurements and hardness assessments were instrumental in identifying optimal combinations of temperature and duration for solution treatment and quenching. Subsequent hardness comparisons were made for selected combinations after the aging stages. This study required solution treatment, quenching, and tempering steps to maximize hardness. Hence, direct aging did not result in the hardness required. The most effective heat treatment involved solution treatment at 1150&#xa0;°C for 30&#xa0;min, followed by oil quenching and aging at 480&#xa0;°C for 4 h, resulting in a hardness value of 480 ± 6&#xa0;HV, surpassing the baseline.</p>

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Impact of Heat Treatment on Hardness in Laser-Powder Bed Fusion (L-PBF) 17-4 PH Stainless Steel

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Mathilde Costes,
  • Morgane Mokhtari,
  • Joël Alexis,
  • Lionel Arnaud

摘要

Attaining the desired mechanical characteristics in materials often requires post-fabrication heat treatments, primarily for stress relief and, at times, to enhance strength. This research focused on optimizing post-fabrication heat treatments for precipitation-hardened 17-4 PH stainless steel, essential for maximizing hardness. The unique microstructure and composition of the L-PBF process necessitate tailored heat treatments rather than the conventional H900 treatment. A plate of samples was built and subjected to various heat treatments. Dilatometric measurements and hardness assessments were instrumental in identifying optimal combinations of temperature and duration for solution treatment and quenching. Subsequent hardness comparisons were made for selected combinations after the aging stages. This study required solution treatment, quenching, and tempering steps to maximize hardness. Hence, direct aging did not result in the hardness required. The most effective heat treatment involved solution treatment at 1150 °C for 30 min, followed by oil quenching and aging at 480 °C for 4 h, resulting in a hardness value of 480 ± 6 HV, surpassing the baseline.