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<p>Prolonged aging can lead to detrimental precipitation in alumina-forming austenitic stainless steels (AFAs). This study investigates the Fe–24Ni–14Cr–3Al–2.5Cu–0.5Nb (AFA) alloy at 710&#xa0;°C with and without tungsten (W). Microstructural analysis revealed NbC formation after homogenization at 1260&#xa0;°C for 7&#xa0;h. Aging at 710&#xa0;°C showed that the W-free alloy developed both NbC and L12-ordered Ni–Cu–Al phases, while the W-containing alloy exhibited smaller Ni–Cu–Al phases. After 2200&#xa0;h, the W-free alloy showed δ-ferrite and Laves-Fe<sub>2</sub>Nb phases, whereas the W-alloy developed Laves-Fe<sub>2</sub>W and B2-NiAl phases in greater amounts. This phase formation suppressed the detrimental δ-ferrite network and enhanced room temperature tensile and corrosion properties. The nucleation of Fe<sub>2</sub>W at grain boundary junctions reduced stress concentration, improving ductility and passivation strength in the W-containing steel.</p>

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Effect of Tungsten on Precipitation Formation and Performance of Fe–24Ni–14Cr–3Al–2.5Cu–0.5Nb Alloys at Elevated Temperature

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Muhammad Saqlain Qurashi,
  • Muhammad Habib,
  • Afsar Khan,
  • Muhammad Arif,
  • Adil Mansoor

摘要

Prolonged aging can lead to detrimental precipitation in alumina-forming austenitic stainless steels (AFAs). This study investigates the Fe–24Ni–14Cr–3Al–2.5Cu–0.5Nb (AFA) alloy at 710 °C with and without tungsten (W). Microstructural analysis revealed NbC formation after homogenization at 1260 °C for 7 h. Aging at 710 °C showed that the W-free alloy developed both NbC and L12-ordered Ni–Cu–Al phases, while the W-containing alloy exhibited smaller Ni–Cu–Al phases. After 2200 h, the W-free alloy showed δ-ferrite and Laves-Fe2Nb phases, whereas the W-alloy developed Laves-Fe2W and B2-NiAl phases in greater amounts. This phase formation suppressed the detrimental δ-ferrite network and enhanced room temperature tensile and corrosion properties. The nucleation of Fe2W at grain boundary junctions reduced stress concentration, improving ductility and passivation strength in the W-containing steel.