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| Dynamic Recrystallization Behaviors of Low Carbon Q690qENH High–strength Bridge Steels |
| CHEN Jun1, TANG Shuai1, ZHOU Yanlei1, LIU Zhenyu1, WANG Guodong1, YANG Ying2, CHEN Junping2 |
1.The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2.ANGANG Steel Company Limited, Anshan 114021 |
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Cite this article:
CHEN Jun TANG Shuai ZHOU Yanlei LIU Zhenyu WANG Guodong YANG Ying CHEN Junping. Dynamic Recrystallization Behaviors of Low Carbon Q690qENH High–strength Bridge Steels. Chin J Mater Res, 2012, 26(2): 199-205.
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Abstract The dynamic recrystallization behaviors of low carbon Q690qENH high–strength bridge steel were investigated by hot compression deformation using MMS–300 thermo–simulation machine. The results show the softening of low carbon Q690qENH high-strength bridge steel is mainly controlled by dynamic recovery during hot rolling deformation and the dynamic recrystallization occurs obviously at low strain rates of 0.1 s−1 and 0.2 s−1. The stress factor was modified as 0.0099 MPa−1, the dynamic recrystallization activation energies were gained, and the dynamic recrystallization kinetics model was established. The expression of εc=0.72εp was determined using P–M–K method. Correlations between peak strain and Z/A are power function, and dynamic recrystallization critical strain model was established calculation values of which are good agreement with evolution of microstructure during hot deformation. Effects of temperature on migration–rate of interface were also investigated during dynamic recrystallization.
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Received: 31 August 2011
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| Fund: Supported by the Fundamental Research Funds for the Central Universities No.N110607003, N100507002. |
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