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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摘要为了研究热轧及成品析出相对Ti-IF钢塑性应变比的影响,采用热力学计算结合万能试验机、透射电镜、能谱仪及电子背散射衍射分析手段,研究了两种Ti-IF钢在不同热轧加热温度下碳化物在热轧及镀锌退火过程中的析出行为。结果表明,随着热轧加热温度的降低,热轧卷析出相尺寸不断增大,Ti₄C₂S₂及其与Cu₂S复合析出相尺寸由50～100 nm增加到100～200 nm,析出相主要呈球形或椭球形以胞状或连续链状形态分布。随着硫含量的降低,1 230 ℃高温加热热轧卷中含有较多尺寸为10～20 nm细小TiC析出相,同时在镀锌退火后得以保留,而在较高硫含量时热轧卷或镀锌卷中却很少发现TiC粒子析出,即在较高硫含量时可析出更多的粗大Ti₄C₂S₂并抑制细小TiC析出及长大。较高硫含量镀锌卷{111}面织构比例分别达到87.5%以上,在力学性能上表现出更高的塑性应变比。

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	韩赟
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关键词 ： Ti-IF, 塑性应变比, 硫含量, 加热温度, 析出相

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

收稿日期: 2020-06-22

引用本文:

韩赟, 邱木生, 邹英, 王刚. 高塑性应变比Ti-IF钢组织性能及析出相[J]. 钢铁, 2021, 56(3): 77-83. HAN Yun, QIU Mu-sheng, ZOU Ying, WANG Gang. 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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