高塑性应变比Ti-IF钢组织性能及析出相

doi:10.13228/j.boyuan.issn0449-749x.20200318

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Abstract In order to study the effect of hot rolling and final product precipitates on the plastic strain ratio of Ti-IF steel, The precipitation behavior of micro-alloyed carbides during hot rolling and galvanized annealing of two Ti-IF steels at different hot-rolling heating temperatures were studied by universal testing machine, transmission electron microscope (TEM), energy dispersive spectrometer(EDS) and electron backscattered diffraction(EBSD) analysis methods combined with thermodynamic calculation. The results showed that the size of the precipitates of hot-rolled coils increased with the decrease of hot-rolling heating temperature, the size of the precipitates of Ti₄C₂S₂ and its composite with Cu₂S increased from 50-100 nm to 100-200 nm. The precipitates are mainly spherical or ellipsoidal distributed in a cellular or continuous chain-like form. With the reduction of sulfur content, hot-rolled coils heated at 1 230 ℃ contain more TiC precipitates with size of 10-20 nm, which can be retained after annealing in galvanizing, while TiC particles are rarely found in hot-rolled or galvanized coils at higher sulfur content. That is, more coarse Ti₄C₂S₂ can be precipitated at higher sulfur content while the precipitation and growth of fine TiC is inhibited. The {111} surface texture ratio of galvanized coil with higher sulfur content reached more than 87.5%, therefore it′s exhibiting higher plastic strain ratio in terms of mechanical properties.

Key words： Ti-IF plastic strain ratio sulfur content heating temperature precipitate

Received: 22 June 2020

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	HAN Yun
	QIU Mu-sheng
	ZOU Ying
	WANG Gang

Cite this article:

HAN Yun,QIU Mu-sheng,ZOU Ying等. Precipitates, microstructure and properties of Ti-IF steel with high plastic strain ratio[J]. Iron and Steel, 2021, 56(3): 77-83.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200318 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I3/77

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