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<p>This study investigates the microstructure, corrosion resistance, and mechanical performance of 2-mm-thick super duplex stainless steel (SDSS) sheets welded with&#xa0;pulsed current gas tungsten arc welding (PC-GTAW) process. The microstructural examination of the welded joint indicated the development of coarse ferrite-austenite grains having Widmanstätten austenite in the heat-affected zone (HAZ) because of thermal exposure. The fusion zone (FZ) displayed a refined dendritic ferrite structure and long austenite islands, indicating rapid solidification. The Bode plot of FZ has the maximum negative&#xa0;phase angle (−55&#xa0;°C), indicating a robust and protective passive film and excellent corrosion resistance. The Tafel plots revealed a corrosion rate of 0.704 × 10<sup>-9</sup>&#xa0;mm/year, indicating excellent corrosion resistance. The EDX spectroscopy showed elemental distributions, revealing that FZ exhibits increased peaks of Fe, Cr, and Mo that are essential for corrosion resistance of welds. The tensile test shows that the PC-GTAW welded SDSS joint maintains mechanical characteristics equivalent to the base metal, with yield strength reduced by only 0.9% and ultimate tensile strength reducing by merely 0.95% compared to base metal. Microhardness&#xa0;analysis confirmed a rise in Vickers microhardness from 285 HV (base metal) to 305 HV (HAZ) because of grain refinement, indicating excellent mechanical properties.</p>

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Effect of Pulsed GTAW Parameters on the Microstructure, Corrosion Resistance and Mechanical Properties of Super Duplex Stainless Steel Welds

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Sujeet Kumar,
  • Naveen Srinivas Madugula,
  • Naveen Kumar

摘要

This study investigates the microstructure, corrosion resistance, and mechanical performance of 2-mm-thick super duplex stainless steel (SDSS) sheets welded with pulsed current gas tungsten arc welding (PC-GTAW) process. The microstructural examination of the welded joint indicated the development of coarse ferrite-austenite grains having Widmanstätten austenite in the heat-affected zone (HAZ) because of thermal exposure. The fusion zone (FZ) displayed a refined dendritic ferrite structure and long austenite islands, indicating rapid solidification. The Bode plot of FZ has the maximum negative phase angle (−55 °C), indicating a robust and protective passive film and excellent corrosion resistance. The Tafel plots revealed a corrosion rate of 0.704 × 10-9 mm/year, indicating excellent corrosion resistance. The EDX spectroscopy showed elemental distributions, revealing that FZ exhibits increased peaks of Fe, Cr, and Mo that are essential for corrosion resistance of welds. The tensile test shows that the PC-GTAW welded SDSS joint maintains mechanical characteristics equivalent to the base metal, with yield strength reduced by only 0.9% and ultimate tensile strength reducing by merely 0.95% compared to base metal. Microhardness analysis confirmed a rise in Vickers microhardness from 285 HV (base metal) to 305 HV (HAZ) because of grain refinement, indicating excellent mechanical properties.