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Modelling of microstructure evolution during hot rolling of a high-Nb HSLA steel

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Abstract

The microstructure evolution during thermo-mechanical processing of high-Nb HSLA steel has been investigated with laboratory investigations. Using the Gleeble 2000 thermomechanical simulator, constitutive behavior, recrystallization, and precipitation were quantified with single- and double-hit tests as well as isothermal-deformation-quenching tests. The critical strain (εc) for the onset of dynamic recrystallization in high-Nb steel is derived and the result shows that the critical strain/peak strain ratio is as low as approximately 0.35 and tends to a constant when the effective Nb content (Nbeff = Nb − Mn/120 + Si/94) ranges from 0.07 to 0.10. The interaction between the recrystallization and precipitation was considered to determine non-recrystallization temperature (T nr) under various conditions and further the dependence of the T nr on initial austenite grain size, strain, and strain rate on was formulated.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 50504007), the Fundamental Research Funds for the Central Universities (N090407001) and the National Key Project of Scientific and Technical Supporting Programs (No. 2007BAE51B07). This work also was supported by Benxi Iron & 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, 110004, Shenyang, 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, 110142, Shenyang, People’s Republic of China

    Yong Mei Yu

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  1. Yun Bo Xu
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  2. Yong Mei Yu
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  3. Bao Liang Xiao
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Correspondence to Yun Bo Xu.

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Xu, Y.B., Yu, Y.M., Xiao, B.L. et al. Modelling of microstructure evolution during hot rolling of a high-Nb HSLA steel. J Mater Sci 45, 2580–2590 (2010). https://doi.org/10.1007/s10853-010-4229-6

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