低碳合金钢带状组织控制研究现状

doi:10.13228/j.boyuan.issn0449-749x.20220636

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Abstract Ferrite/pearlite banded structure is a common structural defect in the low carbon alloy steel during hot rolling process,which not only deteriorates the transverse plasticity and toughness of steel,but also seriously affects the service life of subsequent processed parts. In recent years,the control of banded structure has been one of the focuses of high-quality steel research. In order to fully understand the banded structure,the research status of banded structure formation mechanism,influencing factors,and control methods at domestic and foreign were reviewed. The control thought and direction of banded structure are pointed out,which will provide some inspiration and reference for future research. It is found that alloy element segregation is a necessary condition for the formation of banded structure,while ferrite nucleation,growth and diffusion of element C are the decisive conditions for the banded structure formation. The difference of ferrite nucleation rate between the element enrichment zone and depletion zone is the direct reason affecting the formation of banded structure. Increasing the cooling rate after hot rolling can not only reduce the difference of ferrite nucleation rate,but also reduce the diffusion distance of element C and inhibit the formation of banded structure. Moreover,the larger austenite grain size obtained by recrystallization can reduce the unit volume ferrite nucleation site,hinder the formation of ferrite growth plane,affect the continuity of element segregation band,and then destroy the formation of banded structure. However,the formation of widmanstatten structure at a faster cooling rate and the formation of coarse ferrite grains by the larger austenite grains transformation are not conducive to the matrix properties. In the solid-state phase transformation process,oxide metallurgy technology can regulate the formation of intragranular ferrite and the growth direction of proeutectoid ferrite,improve the anisotropy of microstructure and mechanical properties,and realize the control of banded structure.

Key words： low carbon alloy steel banded structure formation mechanism solid-state phase transformation

Received: 11 October 2022

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	YANG Yong-kun
	ZHU Jia-yu
	LI Xiao-ming
	WANG Yang
	ZHAN Dong-ping

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YANG Yong-kun,ZHU Jia-yu,LI Xiao-ming等. A review of research on banded structure control in low carbon alloy steel[J]. Iron and Steel, 2023, 58(4): 1-10.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220636 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I4/1

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