Effect of Nb on the dynamic recrystallization behavior of high-grade pipeline steels |
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Authors: | Tao Niu Yong-lin Kang Hong-wei Gu Yu-qun Yin Ming-liang Qiao Jin-xing Jiang |
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Institution: | (1) Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing of the Ministry of Education, School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China;(2) Department of Chemical and Petroleum Engineering, Karamay Vocational & Technical College, Xinjiang, 833600, China;(3) School of Chemical Engineering, Inner Mongolia Polytechnic University, Huhhot, 010062, China |
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Abstract: | The dynamic recrystallization (DRX) behavior of high-grade X80/X100 pipeline steels with different Nb contents was investigated
through single pass compression experiment using a Gleeble 1500 thermomechanical simulator. By the regression of stress-strain
data obtained in the experiment, the deformation activation energy of DRX was identified, and the critical strain was calculated
with the Poliak-Jonas (P-J) method. Based on the analysis, the occurrence condition and kinetics of DRX were determined. The
results show that as the Nb content increases from 0.08wt% to 0.095wt%, the activation energy of recrystallization raises
from 365 to 395 kJ/mol. The critical strain of DRX can be determined more accurately by the P-J method, and the ratios of
critical strain to peak strain of X80 and X100 pipeline steels are 0.51 and 0.49, respectively, which are similar to the results
achieved by other researchers and calculated with empirical formulae. |
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