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利用Gleeble-3500热力模拟实验机对含Nb-Ti低碳微合金钢双道次高温压缩软化行为进行了模拟研究。研究了各种变形参数对该钢软化行为的影响,建立了该钢软化行为的动力学方程。结果表明,随着道次间停留时间的延长、变形温度、变形量以及应变速率的增大,再结晶率随之增大。变形温度对奥氏体晶粒尺寸有着显著的影响,变形温度的降低将使奥氏体晶粒尺寸明显粗化;奥氏体晶粒尺寸随着道次间停留时间的延长而增大,随着变形量以及应变速率的增大而减小。
The compression and softening behavior of Nb-Ti low carbon microalloyed steel at two passes with high temperature was simulated by Gleeble-3500 thermal simulation machine. The effect of various deformation parameters on the softening behavior of the steel was studied, and the dynamic equation of the softening behavior of the steel was established. The results show that the recrystallization rate increases with the increase of residence time, deformation temperature, deformation and strain rate. Deformation temperature has a significant effect on the grain size of austenite. Decreasing the deformation temperature will make the austenite grain size obviously coarsen. The austenite grain size increases with the extension of residence time between passes, Deformation and strain rate increases and decreases.