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| DYNAMIC RECRYSTALLIZATION AND PRECIPITATION BEHAVIORS OF A KIND OF LOW CARBON V–MICROALLYED STEEL |
| CHEN Liqing 1, ZHAO Yang 1, XU Xiangqiu 2, LIU Xianghua 1 |
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2. R & D Center, FAW Group Corporation, Changchun 130011 |
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Cite this article:
CHEN Liqing ZHAO Yang XU Xiangqiu LIU Xianghua. DYNAMIC RECRYSTALLIZATION AND PRECIPITATION BEHAVIORS OF A KIND OF LOW CARBON V–MICROALLYED STEEL. Acta Metall Sin, 2010, 46(10): 1215-1222.
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Abstract By using thermo–mechanical simulator, OM and TEM, the dynamic recrystallization (DRX) and precipitation behaviors of a kind of low carbon V–microalloyed steel have been investigated at temperatures ranging from 900 to 1050℃ and strain rates from 0.01 to 10 s−1. The activation energy (Qdef ) for hot deformation of this kind of V–microalloyed steel was calculated to be 341.97 kJ/mol by regression analysis, while the apparent stress exponent (n) was calculated to be 4.24. The equation describing the hot working process was also obtained. The critical strain for DRX was accurately determined based on the P–J method and high order polynomial fitting between strain hardening rate and true stress, and mathematical models of critical strain and peak strain versus Z parameter were deduced. The dynamic precipitation behavior of V(C, N) particles at low strain rate was further investigated. The results show that with increasing the strain, the average size of V(C, N) particles increases and the size distribution of the precipitates become wide. The calculations of the driving force for recrystallization and pinning force show that once the dynamic recrystallization take place, the dynamic precipitation could not prevent dynamic recrystallization from occurring.
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Received: 03 June 2010
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| Fund: Supported by Program for New Century Excellent Talents in University (No.NCET–06–0285) and Foundation for Innovative Research Team, the Education Department, Liaoning Province |
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