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Warm Deformation and Dynamic Strain Aging of a Nb-Cr Microalloyed Low-Carbon Steel

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Abstract

Warm rolling can be a cost-effective technique to achieve an excellent combination of strength and deep drawing properties in low-carbon steels, as the formation of intergranular shear bands (SBs) induces a {111} recrystallizing texture. However, the formation of SBs can be significantly suppressed due to dynamic strain aging (DSA). Therefore, it is necessary to confirm the temperature where DSA occurs and further investigate its physical mechanism. In this study, compression tests were conducted on Nb-Cr modified low-carbon steels from 250 °C to 650 °C at two true strains of 0.43 and 0.92. The flow stress behavior was carefully analyzed, and the microstructure evolution was investigated by transmission electron microscope (TEM). With an increase in the deformation temperature, DSA occurred at temperatures between 250 °C and 450 °C, and an obviously serrated plastic flow was observed at 350 °C. The TEM results revealed planar dislocations at this stage, resulting from the interactions between the mobile dislocations and solute atoms or nanosized precipitates. When the temperature reached 450 °C and above, the DSA disappeared, the size of the dislocation cells increased, and the dynamic recovery led to the formation of subgrains.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of china (Grant Nos. 51704132,51704131, and 51601174) and the Key Research and Development Program of Jiangxi Province (general project) (Grant Nos. 20161BBE50065 and 20192BBEL50016).

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Authors and Affiliations

  1. School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China

    Zhigang Wang, Xin Liu, Qiangqiang Yuan, Rongchun Chen, Jing Qin & Hongjin Zhao

  2. Special Steel Institute, Central Iron & Steel Research Institute, Beijing, 100081, China

    Jianguo He

  3. China Electric Power Research Institute, Beijing, 100192, China

    Yao Huang

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  1. Zhigang Wang
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  2. Xin Liu
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  3. Qiangqiang Yuan
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  7. Yao Huang
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Correspondence to Zhigang Wang or Hongjin Zhao.

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Manuscript submitted September 8, 2019.

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Wang, Z., Liu, X., Yuan, Q. et al. Warm Deformation and Dynamic Strain Aging of a Nb-Cr Microalloyed Low-Carbon Steel. Metall Mater Trans A 51, 4623–4631 (2020). https://doi.org/10.1007/s11661-020-05855-5

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  • DOI: https://doi.org/10.1007/s11661-020-05855-5

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