Effect of Nb on the dynamic recrystallization behavior of high-grade pipeline steels  

作　　者：Tao Niu Yong-lin Kang Hong-wei Gu Yu-qun Yin Ming-liang Qiao Jin-xing Jiang 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 10083, China [3]Nanjing Iron and Steel Co. Ltd., Nanjing 210035, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2010年第6期742-747,共6页矿物冶金与材料学报（英文版）

摘　　要：The dynamic recrystallization （DRX） behavior of high-grade X80/X100 pipeline steels with different Nb contents was investi- gated through single pass compression experiment using a Gleeble 1500 thermomechanical simulator. By the regression of stress-sWain data obtained in the experiment, the deformation activation energy of DRX was identified, and the critical strain was calculated with the Po- liak-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 swain of DRX can be determined more accurately by the P-J method, and the ratios of critical swain to peak sWain of XS0 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.The dynamic recrystallization （DRX） behavior of high-grade X80/X100 pipeline steels with different Nb contents was investi- gated through single pass compression experiment using a Gleeble 1500 thermomechanical simulator. By the regression of stress-sWain data obtained in the experiment, the deformation activation energy of DRX was identified, and the critical strain was calculated with the Po- liak-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 swain of DRX can be determined more accurately by the P-J method, and the ratios of critical swain to peak sWain of XS0 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.

关 键 词：pipeline steels NIOBIUM dynamic recrystallization activation energy RETARDATION KINETICS 

分 类 号：TG115.23[金属学及工艺—物理冶金] U465.11[金属学及工艺—金属学]