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| Effect of Niobium on Dynamic Recrystallization Behavior of 5%Ni Steel |
| LEI Xiao-rong1,DING Qing-feng1,2,CHEN Yuan-yuan1,RUI Xiao-long2,LI Shu-rui2,WANG Qing-feng1 |
1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
2. Research and Development Center, Wuhan Iron and Steel Company, Wuhan 430080, Hubei, China |
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Abstract The single-pass hot compressions of two 5%Ni steels with and without niobium addition at different temperatures of 800-1150 �� and strain rates of 0. 01-1 s-1 were performed by using a Gleeble-3500 thermal simulator and the effect of niobium on the dynamic recrystallization (DRX) behavior was analyzed. The results showed that the niobium addition of 0. 04% can retard DRX in 5%Ni steel significantly by increasing the activation energy for DRX from 394 to 462 kJ/mol. The critical strain required for starting DRX in 5%Ni steel was increased by 0. 04-0. 10 with niobium addition when the steel was deformed at a strain rate of 0. 01 s-1 and temperatures varied from 950 to 1000 ��. The critical temperature required for starting DRX in 5%Ni steel was also increased from 1000 to 1050 �� with niobium addition when the steel was deformed at a strain rate of 0. 1 s-1. Such a retarded DRX occurring in Nb-added 5%Ni steel can be attributed to the pinning effect of precipitates containing niobium.
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Received: 17 November 2011
Published: 18 June 2013
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Corresponding Authors:
Xiao-Rong LEI
E-mail: ysulxr1987@126.com
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2013, Vol. 20 
