Precipitation behaviors of X80 acicular ferrite pipeline steel

Ai-min Zhao, Yan Wang, Yin-li Chen, Di Tang, Xu-tao Gao, Bi-qiang Zuo

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    Cite this article as:

    Ai-min Zhao, Yan Wang, Yin-li Chen, Di Tang, Xu-tao Gao, and Bi-qiang Zuo, Precipitation behaviors of X80 acicular ferrite pipeline steel, Int. J. Miner. Metall. Mater., 18(2011), No. 3, pp.309-313. https://dx.doi.org/10.1007/s12613-011-0439-4
    Ai-min Zhao, Yan Wang, Yin-li Chen, Di Tang, Xu-tao Gao, and Bi-qiang Zuo, Precipitation behaviors of X80 acicular ferrite pipeline steel, Int. J. Miner. Metall. Mater., 18(2011), No. 3, pp.309-313. https://dx.doi.org/10.1007/s12613-011-0439-4
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    Precipitation behaviors of X80 acicular ferrite pipeline steel

    基金项目: 

    This work was financially supported by the National Science and Technology Support Program for the 11th Five-Year Plan of China (No.2006BAE03A06).

      通信作者:

      Ai-min Zhao E-mail: aimin.zhao@ustb.edu.cn

    The precipitation behaviors of X80 acicular ferrite pipeline steel were investigated by using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The results show that dendritic precipitates in the as-cast steel slabs precipitate mainly in grain boundaries, and these dendritic precipitates dissolve and re-precipitate to two kinds of carbonitrides: Ti- and Nb-rich (Ti, Nb)(C, N) carbonitrides during reheating. Four types of precipitates mainly exist in the hot rolled plate: Ti-rich carbonitrides resulted from the dendritic carbonitrides undissolved during the reheating process; Ti-rich carbonitrides re-precipitated along austenite grain boundaries during the reheating process; NbC carbides mainly heterogeneously nucleated on the small pre-existing Nb-rich carbonitrides in the hot rolling process; and NbC carbides precipitated on dislocations during hot rolling.

     

    Precipitation behaviors of X80 acicular ferrite pipeline steel

    Author Affilications
    • Funds: 

      This work was financially supported by the National Science and Technology Support Program for the 11th Five-Year Plan of China (No.2006BAE03A06).

    • Received: 23 May 2010; Revised: 18 June 2010; Accepted: 05 July 2010;
    The precipitation behaviors of X80 acicular ferrite pipeline steel were investigated by using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The results show that dendritic precipitates in the as-cast steel slabs precipitate mainly in grain boundaries, and these dendritic precipitates dissolve and re-precipitate to two kinds of carbonitrides: Ti- and Nb-rich (Ti, Nb)(C, N) carbonitrides during reheating. Four types of precipitates mainly exist in the hot rolled plate: Ti-rich carbonitrides resulted from the dendritic carbonitrides undissolved during the reheating process; Ti-rich carbonitrides re-precipitated along austenite grain boundaries during the reheating process; NbC carbides mainly heterogeneously nucleated on the small pre-existing Nb-rich carbonitrides in the hot rolling process; and NbC carbides precipitated on dislocations during hot rolling.

     

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