High temperature plastic deformation behavior of non-oriented electrical steel |
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Authors: | Yu-de Xiao Min Li Wei Wang Juan Zhou Guang-liang Wu and Yue-ming Peng |
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Affiliation: | (1) School of Materials Science and Engineering, Central South University, Changsha, 410083, China;(2) Hunan Valin Lianyuan Iron and Steel Company, Lianyuan, 417722, China |
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Abstract: | High temperature plastic deformation behavior of non-orientated electrical steel was investigated by Gleeble 1500 thermo-mechanical
simulator at strain rate of 0.01−10 s−1 and high temperature of 500–1 200 °C. The stress level factor (a), stress exponent (n), structural factor (A) and activation energy (Q) of high temperature plastic deformation process of non-orientated electrical steel in different temperature ranges were
calculated by the Arrhenius model. The results show that, with dynamic elevation of deformation temperature, phase transformation
from α-Fe to γ-Fe takes place simultaneously during plastic deformation, dynamic recovery and dynamic recrystallization process, leading
to an irregular change of the steady flow stress. For high temperature plastic deformation between 500 and 800°C, the calculated
values of a, n, A, and Q are 0.039 0 MPa−1, 7.93, 1.9×1018 s−1, and 334.8 kJ/mol, respectively, and for high temperature plastic deformation between 1 050 and 1 200 °C, the calculated
values of a, n, A, and Q are 0.125 8 MPa−1, 5.29, 1.0×1028 s−1, and 769.9 kJ/mol, respectively.
Foundation item: Project(2005038560) supported by the Postdoctoral Foundation of China; Project(05GK1002-2) supported by Key Program of Hunan
Province |
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Keywords: | non-oriented electrical steel plastic deformation flow stress |
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