Dynamic recrystallization of ferrite in a low-carbon steel |
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Authors: | Li Longfei Yang Wangyue Sun Zuqing |
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Affiliation: | (1) the School of Materials Science & Engineering, University of Science and Technology Beijing, 100083 Beijing, People’s Republic of China;(2) The State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, 100083 Beijing, People’s Republic of China |
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Abstract: | Plane strain compression tests were performed on a low-carbon steel from 550 °C to 700 °C (ferritephase range) at strain rates
of 10 to 5 × 10−4 s−1, and the deformation microstructure evolution was investigated by means of scanning electron microscopy, transmission electron
microscopy (TEM), and electron backscattered diffraction (EBSD). The results indicate that under the present deformation conditions,
dynamic recrystallization of ferrite can occur in the low-carbon steel and lead to grain refinement. With increasing Zener-Hollomon
parameter Z, the mechanism of this process changes from discontinuous dynamic recrystallization to continuous dynamic recrystallization;
the turning point is approximately at Z=1 × 1016 s−1. The increase of parameter Z leads to the decrease of recrystallized grain size of ferrite under steady state of deformation,
and can lead to the formation of ultrafine microstructures with average grain size of about 2 μm. |
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