冷轧中锰钢的超塑性与组织结构演化行为

doi:10.13228/j.boyuan.issn0449-749x.20190535

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Abstract In order to study the superplastic properties of aluminum-containing cold-rolled medium-manganese steel and the evolution of its microstructure under superplastic deformation,cold-rolled aluminum-containing medium-manganese steel was subjected to a high-temperature tensile test at 800 ℃ and the microstructure under different deformation. The results show that the elongations of 0.05C5Mn2Al,0.10C5Mn2Al and 0.15C5Mn3Al steels have reached 740%,850% and 350%,respectively,and they have obtained superplasticity. The EBSD characterization results show that the two cold-rolled microstructures of 0.05C5Mn2Al and 0.10C5Mn2Al are uniform and fine. It has high stability during high-temperature tensile process. During the tensile process,ferrite and original austenite grow uniformly,and the maximum grain size is less than 10 μm. However,0.15C5Mn3Al cold rolled microstructure has band-shaped ferrite. This microstructure is easy to grow abnormally by annexing fine ferrite and original austenite grains,and the size reaches 20 μm after high temperature tensile. By analyzing the relationship between the superplastic behavior and microstructure evolution of three cold-rolled medium-manganese steels containing Al,it is considered that the initially uniform cold-rolled microstructure has high stability which is conducive to superplasticity. Band-shaped ferrite is prone to abnormal growth and not conducive to superplasticity.

Key words： cold rolled medium manganese steel high temperature tensile superplasticity microstructure structural stability

Received: 09 December 2019

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	LIU Si-han
	WANG Cun-yu
	XU Hai-feng
	CAO Wen-quan

Cite this article:

LIU Si-han,WANG Cun-yu,XU Hai-feng等. Superplasticity and microstructure evaluation of cold rolled medium manganese steels[J]. Iron and Steel, 2020, 55(9): 97-103.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190535 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I9/97

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