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<p>This study investigates the influence of ferroniobium (FeNb) lump size and dissolution temperature on the dissolution kinetics, microstructure, and resulting mechanical and corrosion properties of a Nb-stabilized austenitic stainless steel (AISI 347). FeNb was added to an AISI 304 base steel under three distinct dissolution conditions involving variations in lump size (25–30&#xa0;mm and 45–50&#xa0;mm) and temperature (1560–1590&#xa0;°C and 1610–1630&#xa0;°C). Dissolution kinetics were monitored via time-resolved chemical analysis, while microstructural evolution was characterized by scanning electron and optical microscopy and thermodynamic simulations. Mechanical performance was assessed through tensile and impact testing, and corrosion resistance was evaluated via potentiodynamic polarization in chloride solution. Results indicate that lump size and dissolution temperature affect features such as niobium carbonitrides morphology, delta ferrite stability and austenitic matrix composition. These features strongly influence mechanical behavior, with the best combination of strength, ductility and toughness observed in the condition containing fragmented carbonitrides, retained delta ferrite and solid solution strengthening enhanced by niobium and silicon, yielded by coarse lump dissolution at lower temperatures. Corrosion resistance presented a complex dependence on these features, being strongly affected by the presence of microgalvanic cells. The findings highlight the critical role of dissolution conditions in tailoring the performance of Nb-stabilized stainless steels.</p>

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Effect of FeNb lump size and dissolution temperature on microstructure and properties of a Nb-stabilized austenitic stainless steel

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Bruna Callegari,
  • Matheus Passos Sarmento Santos,
  • Ygor Tadeu Bispo dos Santos,
  • Daniel Evangelista Caixeta,
  • Vinícius Elias de Godoy,
  • Tiago Nunes Lima,
  • Rodrigo Santiago Coelho

摘要

This study investigates the influence of ferroniobium (FeNb) lump size and dissolution temperature on the dissolution kinetics, microstructure, and resulting mechanical and corrosion properties of a Nb-stabilized austenitic stainless steel (AISI 347). FeNb was added to an AISI 304 base steel under three distinct dissolution conditions involving variations in lump size (25–30 mm and 45–50 mm) and temperature (1560–1590 °C and 1610–1630 °C). Dissolution kinetics were monitored via time-resolved chemical analysis, while microstructural evolution was characterized by scanning electron and optical microscopy and thermodynamic simulations. Mechanical performance was assessed through tensile and impact testing, and corrosion resistance was evaluated via potentiodynamic polarization in chloride solution. Results indicate that lump size and dissolution temperature affect features such as niobium carbonitrides morphology, delta ferrite stability and austenitic matrix composition. These features strongly influence mechanical behavior, with the best combination of strength, ductility and toughness observed in the condition containing fragmented carbonitrides, retained delta ferrite and solid solution strengthening enhanced by niobium and silicon, yielded by coarse lump dissolution at lower temperatures. Corrosion resistance presented a complex dependence on these features, being strongly affected by the presence of microgalvanic cells. The findings highlight the critical role of dissolution conditions in tailoring the performance of Nb-stabilized stainless steels.