Effect of reverse phase transformation annealing time on microstructure and mechanical properties of 5%Mn cold-rolled medium manganese steel

doi:10.13251/j.issn.0254-6051.2023.06.005

Abstract

Abstract: Effect of reverse phase transformation annealing time on microstructure and mechanical properties of 5%Mn cold-rolled medium manganese steel was studied by means of optical microscope, scanning electron microscope, transmission electron microscope, and X-ray diffraction. The results show that the microstructure of the cold-rolled medium manganese steel after quenching at 930 ℃ for 20 min and reverse phase transformation annealing at 675 ℃ for 5-40 min is also martensite, ultra fine grain ferrite and austenite with different volume fractions. When holding time is 5 min, the microstructure continues to be quenched lath martensite, and the volume fraction of austenite is only 8.5%. As the holding time extendes to 10, 20, and 30 min, the volume fraction of austenite increases to 10.56%, 19.7%, and 22.34%, respectively, while the holding time continues to extend to 40 min, the austenite volume fraction decreases to 20.53%. With the increase of holding time, the tensile strength continues to increase, and the elongation, product of strength and elongation increases first and then decreases, the product of strength and elongation reaches the maximum at 30 min, and the comprehensive mechanical properties are the best.

Key words: medium manganese steel, austenite, product of strength and elongation, segregation

CLC Number:

TG142.1

Fan Lifeng, Guo Zhiyu, Zhang Zhipeng, Yue Erbin, Xiao Lijun, Gao Jun, He Jianzhong. Effect of reverse phase transformation annealing time on microstructure and mechanical properties of 5%Mn cold-rolled medium manganese steel[J]. Heat Treatment of Metals, 2023, 48(6): 29-35.

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