基于Nb,Ti和V含量不同的6种低碳含Nb微合金钢的热模拟实验数据,利用硬化速率-应力(θ-σ)曲线,准确确定了其发生动态再结晶的临界应变εc、峰值应变εp、临界应力σc、峰值应力σp和稳态应力σss值.结果表明,峰值应力σp随Nb,Ti和V含量的增加而增大,6种实验钢发生动态再结晶的εc/εp的取值范围为0.50-0.65.采用σ-ε曲线法计算获得了动态再结晶的Avrami动力学曲线,与采用金相方法得到的动态再结晶动力学曲线比较接近.随着钢中Nb和Ti含量增加,动态再结晶的Avrami动力学曲线右移;Nb微合金钢中复合添加Ti和V则导致在更低的应变速率下才能发生动态再结晶.
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