Increasing the yield strength of high nitrogen austenitic stainless steel is important both scientifically and commercially. In this work, 18Mn18Cr0.6 N steel was cold rolled and annealed at 800 °C. the microstructure was investigated using electron backscatter diffraction, transmission electron microscopy, and X-ray diffraction. The yield strength was examined through tensile tests. The fracture morphology was studied by scanning electron microscopy. The corrosion resistance was analyzed through potentiodynamic polarization tests. Unusual dispersed fine globular Cr₂N precipitates, rather than usual detrimental discontinuous cellular Cr₂N precipitates, were obtained in 18Mn18Cr0.6 N steel after thermomechanical processing that comprised 70% cold rolling and 20 min annealing at 800 °C. the yield strength was increased by ~228 MPa, up to 910 MPa, because of the precipitation-strengthening effect of Cr₂N. The ductility remained well. Cr₂N precipitation behavior was analyzed. The strengthening effects of Cr₂N, grain size, and interstitial elements on yield strength and their inter-relationship are discussed. This study provides a new insight into enhancing the yield strength of high nitrogen austenitic stainless steels

提高高氮奥氏体不锈钢的屈服强度在科学和商业上都很重要。在这项工作中，18Mn18Cr0.6 N 钢被冷轧并在 800 °C 下退火。使用电子背散射衍射、透射电子显微镜和 X 射线衍射研究微观结构。通过拉伸试验检查屈服强度。通过扫描电子显微镜研究断口形貌。通过动电位极化试验分析耐腐蚀性。异常分散的细小球状 Cr ₂ N 沉淀，而不是通常有害的不连续细胞 Cr ₂在 18Mn18Cr0.6 N 钢经过包括 70% 冷轧和 800 °C 退火 20 分钟的热机械加工后，会在 18Mn18Cr0.6 N 钢中获得 N 析出物。由于 Cr ₂ N的沉淀强化作用，屈服强度提高了~228 MPa，最高可达 910 MPa 。延展性保持良好。分析了Cr ₂ N 析出行为。讨论了Cr ₂ N、晶粒尺寸和间隙元素对屈服强度的强化作用及其相互关系。这项研究为提高高氮奥氏体不锈钢的屈服强度提供了新的见解