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Microstructural evolution in an ultralow-C and high-Nb bearing steel during continuous cooling

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Abstract

The microstructural evolution during continuous cooling has been investigated in an ultralow-C and high-Nb containing steel and compared to that of a traditional Nb–Mo pipeline steel. The deformation promotes the formation of fine-grained quasi-polygonal and acicular ferrite in coarse grain sized austenite. Lowering the austenite grain size leads to a loss in hardenability of austenite despite the fact that grain sizes of the final microstructure are refined. The high-Nb and Nb–Mo bearing materials have the nearly same effect on lowering the onset temperatures of transformation, but the former is somewhat faster in the progress of transformation due to an additional work-hardening effect. Thus, to obtain sufficient amounts of ultrafine-grained acicular ferrite, cooling rate must be increased to suppress the formation of high-temperature transformed products in high-Nb materials.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China under contract No. 50504007 and the National Key Project of Scientific and Technical Supporting Programs (No. 2007BAE51B07). This study also was supported by Benxi Iron and Steel Corp., China.

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Authors and Affiliations

  1. State Key Laboratory of Rolling Technology and Automation, Northeastern University, P.O. Box 105, Shenyang, 110004, People’s Republic of China

    Yun Bo Xu, Bao Liang Xiao, Zhen Yu Liu & Guo Dong Wang

  2. Mechanical Engineering School, Shenyang University of Chemical Technology, Shenyang, 110142, People’s Republic of China

    Yong Mei Yu

Authors
  1. Yun Bo Xu
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  2. Yong Mei Yu
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  3. Bao Liang Xiao
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  4. Zhen Yu Liu
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  5. Guo Dong Wang
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Correspondence to Yun Bo Xu.

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Xu, Y.B., Yu, Y.M., Xiao, B.L. et al. Microstructural evolution in an ultralow-C and high-Nb bearing steel during continuous cooling. J Mater Sci 44, 3928–3935 (2009). https://doi.org/10.1007/s10853-009-3526-4

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  • DOI: https://doi.org/10.1007/s10853-009-3526-4

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