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<p>Superaustenitic stainless steels are widely used in industry; however, the literature addressing the properties of weld metals is limited, which can restrict their use in claddings. Besides, scarce works discuss the effect of post-welding heat treatments on the properties. This work studies the performance of superaustenitic stainless steel weld metals deposited by the electron slag process after aging in temperatures between 600 and 1000&#xa0;°C and its consequence on the corrosion behavior. The properties were investigated by scanning electron microscopy and electron backscattering diffraction for microstructural characterization and Vickers microhardness tests. The pitting potential and critical pitting temperature were determined to evaluate the corrosion performance. The results revealed poor corrosion performance for the samples aged at temperatures from 700 to 900&#xa0;°C as a consequence of the <i>σ</i>-phase at the grain boundaries. At 1000&#xa0;°C, the precipitation at grain boundaries vanished, and the corrosion properties were restored. The heterogeneity unavoidable in weld metals accelerated the precipitation kinetics, promoting a reduction of 100&#xa0;°C in comparison with base metals, thus suggesting that data from wrought alloys are not appropriate to predict the behavior of weld metals. Although no significant changes were observed after aging at 600&#xa0;°C for 10&#xa0;hours, an additional treatment performed at 600&#xa0;°C for 100 hours evidenced the drop of corrosion performance, thus indicating that the weld metal studied is not recommended for service at high temperature.</p>

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Influence of the Aging Treatments on the Microstructural Evolution and Corrosion Performance of a Superaustenitic Weld Metal

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Jorge C. F. Jorge,
  • Luís Felipe G. de Souza,
  • Matheus C. Mendes,
  • Humberto N. Farneze,
  • Cilene L. A. Silva,
  • Leonardo S. Araújo,
  • Hiron A. Y. Magalhães

摘要

Superaustenitic stainless steels are widely used in industry; however, the literature addressing the properties of weld metals is limited, which can restrict their use in claddings. Besides, scarce works discuss the effect of post-welding heat treatments on the properties. This work studies the performance of superaustenitic stainless steel weld metals deposited by the electron slag process after aging in temperatures between 600 and 1000 °C and its consequence on the corrosion behavior. The properties were investigated by scanning electron microscopy and electron backscattering diffraction for microstructural characterization and Vickers microhardness tests. The pitting potential and critical pitting temperature were determined to evaluate the corrosion performance. The results revealed poor corrosion performance for the samples aged at temperatures from 700 to 900 °C as a consequence of the σ-phase at the grain boundaries. At 1000 °C, the precipitation at grain boundaries vanished, and the corrosion properties were restored. The heterogeneity unavoidable in weld metals accelerated the precipitation kinetics, promoting a reduction of 100 °C in comparison with base metals, thus suggesting that data from wrought alloys are not appropriate to predict the behavior of weld metals. Although no significant changes were observed after aging at 600 °C for 10 hours, an additional treatment performed at 600 °C for 100 hours evidenced the drop of corrosion performance, thus indicating that the weld metal studied is not recommended for service at high temperature.