Effect of reverse phase transformation annealing temperature after quenching on microstructure and properties of 5%Mn cold rolled medium manganese steel

doi:10.13251/j.issn.0254-6051.2022.07.016

Abstract

Abstract: Effect of annealing temperature on microstructure and mechanical properties of a 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing respectively at 660, 665, 675 and 685 ℃ for 30 min were studied by means of OM, SEM and XRD. The results show that after high temperature quenching and reverse phase transformation annealing, the microstructure of the 5%Mn cold rolled medium manganese steel is composed of ultra-fine-grained ferrite, lath martensite and austenite. As the reverse phase transformation annealing temperature increases from 660 ℃ to 685 ℃, the austenite content increases first then decreases and reaches the maximum value at 665 ℃, the tensile strength increases continuously, the yield strength increases first then decreases and reaches the maximum value at 675 ℃, and the elongation increases first then decreases and reaches the maximum value at 665 ℃. In conclusion, the comprehensive mechanical properties are the best for the 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing at 665 ℃ for 30 min, at which the volume fraction of austenite is 24.24%, the tensile strength is 980 MPa, the elongation is 23.68%, and the product of strength and plasticity is 23.21 GPa·%.

Key words: cold-rolled medium manganese steel, annealing temperature, microstructure, mechanical properties

CLC Number:

TG142.1

Fan Lifeng, Kang Ze, Jia Liying, Xu Huimin, Gao Jun. Effect of reverse phase transformation annealing temperature after quenching on microstructure and properties of 5%Mn cold rolled medium manganese steel[J]. Heat Treatment of Metals, 2022, 47(7): 92-97.

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