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<p>An impact of nitroxy-quenching polishing quenching (QPQ) process on the microstructure and hardness of additively manufactured (AM) 17-4PH stainless steel is reported in this study. Nitriding was conducted at 580&#xa0;°C for 2&#xa0;h, followed by oxidation at three different temperatures of 350&#xa0;°C, 400&#xa0;°C, and 450&#xa0;°C for 30&#xa0;min each. The oxidation process notably enhances the hardness of AM 17-4PH steel. The as-built and QPQ-treated samples are subjected to a thorough microstructural examination using an optical microscope, an energy-dispersive x-ray spectroscopy (EDS-equipped scanning electron microscopy (SEM), and x-ray diffraction. The findings show that the oxidation temperature increases lead to the increase in nitride layer thickness. The outer layer formed during this process composed of oxides, whereas the diffusion layer contains chromium and iron nitrides.</p>

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Surface Microstructure Evolution of Additively Manufactured 17-4 PH Stainless Steel by Nitroxy-Quenching Polishing Quenching Process

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • J. R. Jessy Michla,
  • C. R. Rajkumar

摘要

An impact of nitroxy-quenching polishing quenching (QPQ) process on the microstructure and hardness of additively manufactured (AM) 17-4PH stainless steel is reported in this study. Nitriding was conducted at 580 °C for 2 h, followed by oxidation at three different temperatures of 350 °C, 400 °C, and 450 °C for 30 min each. The oxidation process notably enhances the hardness of AM 17-4PH steel. The as-built and QPQ-treated samples are subjected to a thorough microstructural examination using an optical microscope, an energy-dispersive x-ray spectroscopy (EDS-equipped scanning electron microscopy (SEM), and x-ray diffraction. The findings show that the oxidation temperature increases lead to the increase in nitride layer thickness. The outer layer formed during this process composed of oxides, whereas the diffusion layer contains chromium and iron nitrides.