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<p>High-nitrogen austenitic stainless steel (HNASS) has excellent corrosion resistance, weldability, and workability. However, its relatively low yield strength limits its application in more demanding service environments. This study employs various thermomechanical processes to regulate the microstructure of HNASS, thereby enhancing its overall performance. Ultimately, a high-performance material with a yield strength of up to 1412&#xa0;MPa and an elongation of 12% was achieved. Research indicates that after the cold-rolled sample is annealed at 500&#xa0;°C, the material exhibits an unusual increase in yield strength. Microstructural characterization reveals that the ultrahigh yield strength is due primarily to the combined effects of dislocation strengthening and the strengthening of lamellar structures with local chemical ordering. This work enhances the mechanical properties of HNASS by tailoring its microstructure and establishes a correlation between microstructural organization and macroscopic performance, providing theoretical guidance for the development of high-performance austenitic stainless steels.</p>

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Research on Strengthening Mechanisms of High-Nitrogen Austenitic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • YanYan Hong,
  • Chang Han,
  • GuangLei Wang

摘要

High-nitrogen austenitic stainless steel (HNASS) has excellent corrosion resistance, weldability, and workability. However, its relatively low yield strength limits its application in more demanding service environments. This study employs various thermomechanical processes to regulate the microstructure of HNASS, thereby enhancing its overall performance. Ultimately, a high-performance material with a yield strength of up to 1412 MPa and an elongation of 12% was achieved. Research indicates that after the cold-rolled sample is annealed at 500 °C, the material exhibits an unusual increase in yield strength. Microstructural characterization reveals that the ultrahigh yield strength is due primarily to the combined effects of dislocation strengthening and the strengthening of lamellar structures with local chemical ordering. This work enhances the mechanical properties of HNASS by tailoring its microstructure and establishes a correlation between microstructural organization and macroscopic performance, providing theoretical guidance for the development of high-performance austenitic stainless steels.