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This study investigates the phase composition and microstructural evolution of nitrided 30VCr3W and 20Cr3MoWV steels using X-ray diffraction (XRD) analysis. Samples underwent gas and ion nitriding under varying process conditions to evaluate their impact on the formation of iron nitrides and overall surface properties. XRD analysis confirmed that prior to nitriding, both steels exhibited a single-phase α-Fe structure. After gas nitriding at 520 ℃, a three-phase structure composed of Fe4N, Fe3N, and Fe2N was identified in 30VCr3W steel, whereas 20Cr3MoWV developed Fe4N, Fe3N, and CrN, highlighting the role of chromium affinity in nitride formation. Ion nitriding resulted in a dominant Fe4N and Fe3N phase composition, with phase fractions varying depending on process parameters. A notable shift in diffraction peak positions toward higher angles suggested a reduced lattice period due to nitrogen depletion in ion-nitrided coatings. Crystallite size analysis indicated similar grain sizes between untreated and ion-nitrided samples, while gas nitriding led to a slight grain refinement. Microhardness measurements demonstrated a significant increase in surface hardness post-nitriding, with ion-nitrided coatings exhibiting marginally higher values compared to gas-nitrided counterparts.

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Structural Approach to the Efficiency of Gas and Ion Nitriding of Construction Medium Alloy Steel

  • 会议论文

  • 发表日期：

    2026年

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  • Nataliia Pinchuk,
  • Mykola Tkachuk,
  • Valentyn Riaboshtan,
  • Oleksandr Terletskyi

摘要

This study investigates the phase composition and microstructural evolution of nitrided 30VCr3W and 20Cr3MoWV steels using X-ray diffraction (XRD) analysis. Samples underwent gas and ion nitriding under varying process conditions to evaluate their impact on the formation of iron nitrides and overall surface properties. XRD analysis confirmed that prior to nitriding, both steels exhibited a single-phase α-Fe structure. After gas nitriding at 520 ℃, a three-phase structure composed of Fe4N, Fe3N, and Fe2N was identified in 30VCr3W steel, whereas 20Cr3MoWV developed Fe4N, Fe3N, and CrN, highlighting the role of chromium affinity in nitride formation. Ion nitriding resulted in a dominant Fe4N and Fe3N phase composition, with phase fractions varying depending on process parameters. A notable shift in diffraction peak positions toward higher angles suggested a reduced lattice period due to nitrogen depletion in ion-nitrided coatings. Crystallite size analysis indicated similar grain sizes between untreated and ion-nitrided samples, while gas nitriding led to a slight grain refinement. Microhardness measurements demonstrated a significant increase in surface hardness post-nitriding, with ion-nitrided coatings exhibiting marginally higher values compared to gas-nitrided counterparts.