Influence of Vanadium Content on Austenite Recrystallization Rule of Low Carbon Steel
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摘要: 为研究钒对低碳钢动态再结晶的影响规律，选取4种对比成分的钒氮微合金化钢，测量动态再结晶的流变应力曲线，获得了峰值应力σp、应变速率ε及变形温度T的对应关系，分析了变形温度、V及N含量对流变应力曲线的影响。建立了钒氮微合金化钢及对比钢的热变形动态再结晶Avrami模型，回归得到其动态再结晶名义激活能。结果表明：V对动态再结晶临界温度提高有限，V和N复合后对动态再结晶临界温度提高明显，延迟再结晶能力增强。Abstract: To investigate the dynamic recrystallization rule of vanadium microalloying low carbon steel and its influence factors,flow curves under dynamic recrystallization conditions of 4 kinds of V-N microalloy steels were obtined by experiments so that the relationship of peak stressσp,strain rateεandtemperature T was obtained from the flow curve.The effect of temperature and content of V,N on dynamic recrystallization model was studied.By the way,an Avrami model for V-N microalloy steels was establishedand and the dynamic recrystallization activation energy was obtained by regression.The results show that V has a limit effect on improving the dynamic recrystallization critical temperature,while V combined with N has the significant effect on the critical temperature so as to inhibit the dynamic recrystallization.
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Key words:
- low carbon steel /
- vanadium /
- microalloyed /
- Avrami model /
- dynamic recrystallization /
- activation energy
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