Effect of annealing temperature on microstructure and mechanical properties of cold-rolled Fe-0.4C-10Mn-6Al high strength steel

doi:10.13251/j.issn.0254-6051.2022.05.020

Abstract

Abstract: Effect of annealing temperature on microstructure and mechanical properties of the cold-rolled Fe-0.4C-10Mn-6Al high strength steel was studied by means of optical microscope, scanning electron microscope, electronic universal tensile test machine, X-ray diffraction and backscattered electron diffraction. The results show that microstructure of the tested steel after cold rolling consists of δ-ferrite, α-ferrite, austenite, martensite and carbide. The annealed microstructure is mainly composed of δ-ferrite, α-ferrite, austenite and carbide, and the austenite content increases with the increase of annealing temperature due to reversed transformation of martensite. With the increase of annealing temperature, the yield strength and tensile strength decrease gradually, while the elongation increases gradually. When the annealing temperature reaches 800 ℃, the product of strength and elongation of the tested steel reaches 27.84 GPa·%, and has good comprehensive mechanical properties.

Key words: cold rolling, annealing, high strength steel, microstructure, mechanical properties

CLC Number:

TG142.1

Su Hongdong, Fan Wei, Feng Yunli. Effect of annealing temperature on microstructure and mechanical properties of cold-rolled Fe-0.4C-10Mn-6Al high strength steel[J]. Heat Treatment of Metals, 2022, 47(5): 126-130.

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