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<p>Nitrogen partitioning-dominated CrMnN stainless steel exhibits an inhomogeneous transformation-induced plasticity (TRIP) effect, due to the formation of multiple <i>in situ</i> composite austenite, thereby achieving superior strength and ductility. This study systematically characterized the microstructure of an ultralow-carbon CrMnN stainless steel under different tensile deformation conditions using methods such as X-ray diffraction (XRD), electron back-scattering diffraction (EBSD), and transmission electron microscopy (TEM). The results show that, after quenching at 1000&#xa0;°C and two partitioning treatments at 500&#xa0;°C, the residual austenite (RA) phase in the steel sample primarily existed in three morphologies: thin-film austenite (TFA), elongated austenite (ELA) and equiaxed austenite (EQA). Among them, equiaxed RA had the lowest mechanical stability, while lath and thin-film RA exhibited higher mechanical stability. Larger RA grain sizes were associated with a lower mechanical stability. The orientation relationships between equiaxed RA, elongated RA, thin-film RA, and martensite all satisfied the Kurdjumov–Sachs (K–S) relationship. A greater tensile deformation resulted in a lower RA amount, and the RA fraction with a lower nitrogen content would transform into martensite earlier.</p>

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Microstructure Characterization of Nitrogen Partitioning-Dominated CrMnN Stainless TRIP Steel Before and After Tensile Deformation

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Haonan Liu,
  • Ziyao Song,
  • Rongbin Li,
  • Chuang Su,
  • Guoshuai Tong,
  • Zean Zhou,
  • Zhiqing Lv,
  • Wantang Fu

摘要

Nitrogen partitioning-dominated CrMnN stainless steel exhibits an inhomogeneous transformation-induced plasticity (TRIP) effect, due to the formation of multiple in situ composite austenite, thereby achieving superior strength and ductility. This study systematically characterized the microstructure of an ultralow-carbon CrMnN stainless steel under different tensile deformation conditions using methods such as X-ray diffraction (XRD), electron back-scattering diffraction (EBSD), and transmission electron microscopy (TEM). The results show that, after quenching at 1000 °C and two partitioning treatments at 500 °C, the residual austenite (RA) phase in the steel sample primarily existed in three morphologies: thin-film austenite (TFA), elongated austenite (ELA) and equiaxed austenite (EQA). Among them, equiaxed RA had the lowest mechanical stability, while lath and thin-film RA exhibited higher mechanical stability. Larger RA grain sizes were associated with a lower mechanical stability. The orientation relationships between equiaxed RA, elongated RA, thin-film RA, and martensite all satisfied the Kurdjumov–Sachs (K–S) relationship. A greater tensile deformation resulted in a lower RA amount, and the RA fraction with a lower nitrogen content would transform into martensite earlier.