基于退火路径的中锰钢组织转变与力学性能

doi:10.13228/j.boyuan.issn0449-749x.20210530

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Abstract In order to guide the industrial trial production of medium manganese steel better, the microstructure evolution and alloy element distribution behavior of low carbon medium manganese steel under different annealing paths were studied by scanning electron microscope (SEM), electron backscatter diffraction (EBSD), transmission electron microscope (TEM) and tensile testing machine. Moreover, its effect on mechanical properties was evaluated. The results show that the microstructure of hot rolled medium manganese steel is mainly composed of ferrite, lath martensite, granular bainite and retained austenite. After cold rolling, the ferrite and martensite grains were broken, and the retained austenite and M/A island were transformed into martensite under strain induced transformation. The microstructure of medium manganese steel under two different annealing paths both consisted of ferrite, retained austenite and a small amount of secondary martensite. The microstructure of one-step annealing process was polygonal and that of two-step annealing process was lath-like. In one-step annealing process, the area fraction, average equivalent grain diameter and Mn content of retained austenite were 25.6%, 0.32 μm and 6.36%, respectively, and that of two-step annealing process were 27.8%, 0.38 μm and 5.37%, respectively. The increase of grain size and decrease of Mn enrichment degree leaded to lower mechanical stability of retained austenite in two-step annealing process. The yield strength of medium manganese steel under two annealing processes was almost the same, but the yield type was obviously different. There was a yield platform with about 4% elongation on the stress-strain curve of one-step annealing process, while the two-step annealing process improved the work hardening and tensile strength at the initial stage of deformation, which eliminated the yield platform. However, in comparison to the one-step annealing process, the ductility loss of medium manganese steel was obvious under the two-step annealing process, and the uniform elongation and total elongation decreased by 4.6 and 6 percentage points, respectively.

Key words： medium manganese steel microstructure evolution retained austenite yield platform mechanical property

Received: 01 September 2021

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	ZOU Ying
	LIU Hua-sai
	HAN Yun
	QIU Mu-sheng
	YANG Feng

Cite this article:

ZOU Ying,LIU Hua-sai,HAN Yun等. Microstructure evolution and mechanical properties of medium manganese steel based on annealing path[J]. Iron and Steel, 2022, 57(4): 97-104.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210530 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I4/97

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