钒对低碳钢动态再结晶的影响规律研究

Influence of Vanadium Content on Austenite Recrystallization Rule of Low Carbon Steel

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σ_p、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。

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.