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<p>The recrystallization microstructure, texture, precipitation behavior, and their effects on the mechanical and corrosion properties of a cold-rolled 26.7Cr–3.7Mo–2Ni super ferritic stainless steel sheet containing pre-precipitated Laves phases are investigated after annealing at 950–1090&#xa0;°C for 1&#xa0;min. Annealing at 950–990&#xa0;°C induced partial dissolution of sub-micron Laves phases, promoting extensive precipitation of nano-sized Laves particles at subgrain and grain boundaries. These nano-particles pinned boundaries, suppressing subgrain coalescence in &lt; 001 &gt; //ND-oriented grains and inhibiting full recrystallization, resulting in a mixed texture of weak γ-fiber combined with strong α- and α*-fibers. The residual Laves phases promoted pit initiation leading to high corrosion rate. In contrast, annealing at 1010–1090&#xa0;°C further dissolved sub-micron Laves phases, reduced nano-sized precipitation, and enabled complete recrystallization. Under these conditions, the average corrosion rate remained consistently low, while a singular, strong γ-fiber texture progressively intensified with temperature. The optimal combination of properties was achieved at 1030&#xa0;°C, exhibiting a tensile strength of 680 MPa, yield strength of 530&#xa0;MPa, elongation of 24.65%, and an average corrosion rate of approximately 0.02&#xa0;mm/a in 6% FeCl<sub>3</sub> + 1% HCl solution at 65&#xa0;°C. Compared with SEA-CURE steel, the experimental alloy exhibited significantly enhanced strength, elongation, and corrosion resistance through controlled Laves phase precipitation and optimized recrystallization annealing, indicating strong potential for practical applications.</p>

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High strength, toughness and corrosion resistant super ferritic stainless steel engineered by Laves phase control and recrystallization annealing

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Cheng-Zhe Qi,
  • Hui-Hu Lu,
  • Ling-Yun Du,
  • Wei-Dong Qiao,
  • Ze-Yang Li,
  • Sheng-Chao Yang

摘要

The recrystallization microstructure, texture, precipitation behavior, and their effects on the mechanical and corrosion properties of a cold-rolled 26.7Cr–3.7Mo–2Ni super ferritic stainless steel sheet containing pre-precipitated Laves phases are investigated after annealing at 950–1090 °C for 1 min. Annealing at 950–990 °C induced partial dissolution of sub-micron Laves phases, promoting extensive precipitation of nano-sized Laves particles at subgrain and grain boundaries. These nano-particles pinned boundaries, suppressing subgrain coalescence in < 001 > //ND-oriented grains and inhibiting full recrystallization, resulting in a mixed texture of weak γ-fiber combined with strong α- and α*-fibers. The residual Laves phases promoted pit initiation leading to high corrosion rate. In contrast, annealing at 1010–1090 °C further dissolved sub-micron Laves phases, reduced nano-sized precipitation, and enabled complete recrystallization. Under these conditions, the average corrosion rate remained consistently low, while a singular, strong γ-fiber texture progressively intensified with temperature. The optimal combination of properties was achieved at 1030 °C, exhibiting a tensile strength of 680 MPa, yield strength of 530 MPa, elongation of 24.65%, and an average corrosion rate of approximately 0.02 mm/a in 6% FeCl3 + 1% HCl solution at 65 °C. Compared with SEA-CURE steel, the experimental alloy exhibited significantly enhanced strength, elongation, and corrosion resistance through controlled Laves phase precipitation and optimized recrystallization annealing, indicating strong potential for practical applications.