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<p>The study investigates the microstructure evolution, mechanical properties, and corrosion resistance of lean duplex stainless steel (LDSS) UNS S32001 following annealing treatments at 950&#xa0;°C, 1050&#xa0;°C, and 1150&#xa0;°C for 30&#xa0;min. Elevated annealing temperatures promote progressive grain coarsening, a pronounced γ → δ phase transformation, and morphological transitions from irregular γ-islands to discrete, coarsened γ-phase islands with smoother interphase boundaries. Electrochemical and morphological analyses collectively demonstrate the corrosion resistance ranking: 1050&#xa0;°C &gt; 950&#xa0;°C &gt; 1150&#xa0;°C. The pitting resistance of S32001 LDSS depends critically on both the austenite/ferrite phase balance and grain structure characteristics. The 1050&#xa0;°C-annealed specimen demonstrates superior pitting resistance, correlating with its near-equilibrium 1:1 δ/γ phase ratio, which enables synergistic passive film formation through complementary alloying element enrichment in both phases. This study provides critical insights into annealing-driven microstructural control in S32001 and establishes a foundation for optimizing weldability and repair strategies.</p>

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Effect of Annealing Temperature on Microstructure Evolution and Corrosion Behavior of Lean Duplex Stainless Steel UNS S32001

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Wenbin Gao,
  • Sanping Chen,
  • Jie Wang,
  • Xiaoyan Gu,
  • Yang Liu,
  • Wei Guan,
  • Wenhang Li,
  • Lixin Xu

摘要

The study investigates the microstructure evolution, mechanical properties, and corrosion resistance of lean duplex stainless steel (LDSS) UNS S32001 following annealing treatments at 950 °C, 1050 °C, and 1150 °C for 30 min. Elevated annealing temperatures promote progressive grain coarsening, a pronounced γ → δ phase transformation, and morphological transitions from irregular γ-islands to discrete, coarsened γ-phase islands with smoother interphase boundaries. Electrochemical and morphological analyses collectively demonstrate the corrosion resistance ranking: 1050 °C > 950 °C > 1150 °C. The pitting resistance of S32001 LDSS depends critically on both the austenite/ferrite phase balance and grain structure characteristics. The 1050 °C-annealed specimen demonstrates superior pitting resistance, correlating with its near-equilibrium 1:1 δ/γ phase ratio, which enables synergistic passive film formation through complementary alloying element enrichment in both phases. This study provides critical insights into annealing-driven microstructural control in S32001 and establishes a foundation for optimizing weldability and repair strategies.