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Precipitation behaviors of X80 acicular ferrite pipeline steel

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Abstract

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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Authors and Affiliations

  1. Research Institute of Metallurgy Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Ai-min Zhao, Yan Wang, Yin-li Chen, Di Tang & Xu-tao Gao

  2. Rolling Mill Business Division, WISDRI Engineering & Research Incorporation Limited Company, Wuhan, 430223, China

    Bi-qiang Zuo

Authors
  1. Ai-min Zhao
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  2. Yan Wang
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  3. Yin-li Chen
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  4. Di Tang
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  5. Xu-tao Gao
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  6. Bi-qiang Zuo
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Correspondence to Ai-min Zhao.

Additional information

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

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Zhao, Am., Wang, Y., Chen, Yl. et al. Precipitation behaviors of X80 acicular ferrite pipeline steel. Int J Miner Metall Mater 18, 309–313 (2011). https://doi.org/10.1007/s12613-011-0439-4

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  • DOI: https://doi.org/10.1007/s12613-011-0439-4

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