Effect of C content on microstructure and mechanical properties of cold-rolled Fe-6Mn-1Al medium manganese steel

doi:10.13251/j.issn.0254-6051.2022.02.007

Abstract

Abstract: Annealed microstructure of cold-rolled medium manganese Fe-6Mn-1Al steel with C content of 0.06%, 0.15% and 0.30%(mass fraction), and the mechanical properties after tensile testing at room temperature were studied. The results show that the microstructure of annealed tested steel with different C contents is composed of ferrite+austenite after annealing at 660 ℃. With the increase of C content, the volume fraction of austenite in the tested steel increases from 19.34% to 38.70%, and the increase of C content leads to the increase of partitioning of C and Mn to austenite, which improves the stability of austenite. The TRIP effect in the deformation process of the tested steel with higher C content is more significant, which improves the work hardening ability of the tested steel and obtains better comprehensive mechanical properties. The product of strength and elongation of the tested steel raises from 28.0 GPa·% to 51.4 GPa·% as the C content increases from 0.06% to 0.30%.

Key words: C content, cold-rolled Fe-6Mn-1Al medium manganese steel, austenite stability, TRIP effect

CLC Number:

TG142.1

Zhao Yanle, Zou Yuming, Ding Hua. Effect of C content on microstructure and mechanical properties of cold-rolled Fe-6Mn-1Al medium manganese steel[J]. Heat Treatment of Metals, 2022, 47(2): 35-40.

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