钒对直接切削用非调质钢动态再结晶的影响

Effect of vanadium on dynamic recrystallization of nonquenched and tempered steels by direct cutting

在Gleeble-3800热模拟试验机上进行热变形试验,研究不同钒质量分数的直接切削用非调质钢在变形温度为950~1 150℃,应变速率为0.1~10 s-1,变形量为60%的单道次压缩的奥氏体再结晶过程,计算得出V1钢的动态再结晶激活能Qd比V2钢提高了79.617 k J/mol,增加钒质量分数具有抑制奥氏体动态再结晶发生的作用。根据试验模拟结果并结合实际生产情况,确定V1钢和V2钢最佳的热加工工艺参数。

The study carried out thermal deformation experiment by Gleeble- 3800 thermal simulation,and the austenite dynamic recrystallization process of non- quenched and tempered steel with different V contents in single pass compression with strain rate 0.1-10 s-1and deformation 60% at 950-1 150 ℃ was studied. The calculated dynamic recrystallization activation energies of V1 steel increased by 79.617 k J/mol than that of V2 steel,and the increase of vanadium content delays the austenite dynamic recrystallization. Based on the experimental results and combined with the actual production,the optimal parameters of thermal process were determined.