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<p>This study investigates the effects of ferritization, 1st-reheating and 2nd-reheating processes on the microstructure evolution and pitting corrosion resistance of the heat-affected zone (HAZ) in duplex stainless steel (DSS) welded joints. Results show that pitting corrosion resistance is primarily influenced by the precipitation of secondary austenite (γ<sub>2</sub>) and Cr<sub>2</sub>N, elemental distribution and the pitting resistance equivalent number (PREN) of the weakest phase. Ferritization significantly reduces γ content and the PREN of ferrite (δ), with abundant Cr<sub>2</sub>N precipitation severely impairing corrosion resistance. During 1st-reheating, γ content increases with temperature, γ<sub>2</sub> precipitates significantly at 1000&#xa0;°C, and both γ<sub>2</sub> and Cr<sub>2</sub>N precipitations are suppressed at 1200&#xa0;°C, improving corrosion resistance. However, 2nd-reheating at 900&#xa0;°C leads to Cr<sub>2</sub>N reprecipitation, reducing corrosion resistance compared to 1st-reheating at 1100&#xa0;°C, with more pitting pits observed.</p>

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Effect of Welding Thermal Cycles on Microstructure and Pitting Corrosion Resistance of Simulated Heat-Affected Zone of Duplex Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Zhiqiang Zhang,
  • Sicheng Qu,
  • Haoran Chu,
  • Hongwei Zhang,
  • Tiangang Zhang,
  • Hongli Liu

摘要

This study investigates the effects of ferritization, 1st-reheating and 2nd-reheating processes on the microstructure evolution and pitting corrosion resistance of the heat-affected zone (HAZ) in duplex stainless steel (DSS) welded joints. Results show that pitting corrosion resistance is primarily influenced by the precipitation of secondary austenite (γ2) and Cr2N, elemental distribution and the pitting resistance equivalent number (PREN) of the weakest phase. Ferritization significantly reduces γ content and the PREN of ferrite (δ), with abundant Cr2N precipitation severely impairing corrosion resistance. During 1st-reheating, γ content increases with temperature, γ2 precipitates significantly at 1000 °C, and both γ2 and Cr2N precipitations are suppressed at 1200 °C, improving corrosion resistance. However, 2nd-reheating at 900 °C leads to Cr2N reprecipitation, reducing corrosion resistance compared to 1st-reheating at 1100 °C, with more pitting pits observed.