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Abstract <p>Plates of 347 stainless steel aged at 700&#xa0;°C up to 200&#xa0;h were gas metal arc welded with an ER347 filler wire (Ø1.2&#xa0;mm) and 98% Ar + 2% O<sub>2</sub> as a shielding gas with a heat input of ~ 1.1&#xa0;kJ/mm. Microstructural and electrochemical characterization was conducted in cross-sections of the welds. Double-loop electropotentiokinetic reactivation was used to determine the degree of sensitization (DOS). The results showed that after 100&#xa0;h of aging, DOS increased up to acceptable values below 4%. Although DOS of the weld metal improved due to the Nb-carbides precipitation, the heat-affected zone (HAZ) on samples aged up to 200&#xa0;h exhibited a decay of intergranular corrosion resistance up to 4 times in comparison to welds performed without previous aging. These findings indicate that the limit for making a weld repair or replacement under these simulated working conditions in this alloy is recommended below 3% of DOS.</p> Graphical Abstract <p></p>

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Effect of welding thermal cycle on the intergranular corrosion resistance of 347 austenitic stainless steel aged at 700 °C

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Giovanna Rodríguez-Hernández,
  • Marco Arturo García-Rentería,
  • Ventura Lilia Cruz-Hernández,
  • Víctor Hugo López-Morelos,
  • Julio Cesar Verduzco-Juárez

摘要

Abstract

Plates of 347 stainless steel aged at 700 °C up to 200 h were gas metal arc welded with an ER347 filler wire (Ø1.2 mm) and 98% Ar + 2% O2 as a shielding gas with a heat input of ~ 1.1 kJ/mm. Microstructural and electrochemical characterization was conducted in cross-sections of the welds. Double-loop electropotentiokinetic reactivation was used to determine the degree of sensitization (DOS). The results showed that after 100 h of aging, DOS increased up to acceptable values below 4%. Although DOS of the weld metal improved due to the Nb-carbides precipitation, the heat-affected zone (HAZ) on samples aged up to 200 h exhibited a decay of intergranular corrosion resistance up to 4 times in comparison to welds performed without previous aging. These findings indicate that the limit for making a weld repair or replacement under these simulated working conditions in this alloy is recommended below 3% of DOS.

Graphical Abstract