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| Strain rate sensitivity of a 1.5 GPa nanotwinned steel |
| R.D. Liu1, Y.Z. Li2, L. Lin1, C.P. Huang2, Z.H. Cao2, M.X. Huang2 |
| 1 Iron and Steel Research Institute, Ansteel Group, Anshan 114021, Liaoning, China; 2 Department of Mechanical Engineering, The University of Hong Kong, Hong Kong 999077, China |
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Abstract Two distinct regimes of strain rate sensitivity on yield strength are found in a high-strength nantwinned steel. The yield strength increases from 1410 to 1776 MPa when the strain rate increases from 10–3 to 1400 s-1. It is proposed from the measured small activation volume that the yielding of the nanotwinned steel at higher strain rates is governed by the dislocation bowing out from the carbon atmosphere. At lower strain rates, however, the yielding is controlled by the continuous re-pinning of dislocations due to the fast diffused carbon atoms, which leads to the relative insensitivity of yield strength to the strain rate.
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| Cite this article: |
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R.D. Liu,Y.Z. Li,L. Lin, et al. Strain rate sensitivity of a 1.5 GPa nanotwinned steel[J]. Journal of Iron and Steel Research International, 2021, 28(11): 1352-1356.
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2021, Vol. 28 
