Abstract
A quantitative analysis was carried out in the present study to determine the effects of titanium (Ti) addition on microstructures and strength of Nb-Ti microalloyed steel. The obtained results revealed that strength was significantly improved with an increase in Ti content from 0.041 to 0.079 wt pct. The difference in the yield strength between the two steel samples occurred due to the different strengthening effects of grain refinement, precipitation, and dislocation strengthening, among which the grain refinement and precipitation strengthening contributions were dominating. With a further increase in the Ti content, ferrite grains became refined. Consequently, a homogeneous ferrite microstructure was attained for high Ti contents. Moreover, large-sized (Ti, Nb)C particles manifested the Kurdjumov–Sachs (KS) relationship, whereas fine (Ti, Nb)C particles held the Baker–Nutting (BN) relationship; thus, abundant fine nanoscale (Ti, Nb)C particles formed after coiling. Furthermore, the high dislocation density facilitated the precipitation of (Ti, Nb)C particles along dislocation lines.
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Acknowledgments
The authors gratefully acknowledge the financial support from The National Natural Science Foundation of China (NSFC) (Grant No. 51874216), The Major Projects of Technology Innovation of Hubei Province (Grant No. 2017AAA116), the Hebei Joint Research Fund for Iron and Steel (Grant No. E2018318013), and the Postdoctoral Innovative Research Post of Hubei Province.
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Manuscript submitted September 5, 2019.
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Gan, X., Yuan, Q., Zhao, G. et al. Quantitative Analysis of Microstructures and Strength of Nb-Ti Microalloyed Steel with Different Ti Additions. Metall Mater Trans A 51, 2084–2096 (2020). https://doi.org/10.1007/s11661-020-05700-9
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DOI: https://doi.org/10.1007/s11661-020-05700-9