To improve the yield strength of high-manganese and high-nitrogen austenitic steels, characterization methods such as scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) were used, and the influence of the controlled rolling process on the microstructure evolution and mechanical properties of high-manganese and high-nitrogen austenitic steels in the Fe-Mn-Cr-N system was systematically investigated. The evolution characteristics of the microstructure and properties of the experimental steels were analyzed in two rolling processes at different temperatures: rolling in the recrystallization zone and the non-recrystallization zone. When the finish rolling temperature decreased from 1 040 ℃ to 973 ℃, the average grain size of the experimental steels decreased, and a small amount of deformation microstructures appeared. Accordingly, the strength, plasticity, and toughness were slightly improved. When the finish rolling temperature dropped to 849 ℃ in the non-recrystallization zone, the experimental steels were filled with deformed austenite grains with higher dislocation density, and the yield strength and tensile strength increased significantly. Low-temperature rolling in the non-recrystallization zone could overcome the limitations of insufficient yield strength of traditional high-manganese austenitic steels and obtain better comprehensive mechanical properties.
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