Abstract: Double passes hot-compression test of martensite steel 403 Nb (% ： 0. 16C, 11. 98Cr, 0. 03Mo, 0. 22 Nb, 0. 01V, 0. 12Ni) with internal time between passes 1 ~ 100 s and strain rate 0. 01 ~ 10 s^-1 at 950 ~ 1 150 °C has been carried out by using Gleeble-3500 thermal simulator. With summarizing established different static recrystallization math models, it is obtained that the activation energy Q_rex of static recrystallization of steel 403 Nb is 168. 40 kJ/mol, die static recrystallization model is t_0.5=6.599 9×10^-10ε^-1.6ε^-0.46 d₀exp( 168 400 /RT). Results show that with short internal time, the steel grain size coarsens and the static recrystallization rate decreases ； with longer internal time, the static recrystallization is nearly completed with most equiaxial grains. During hot compression, the static recrystallization is almost completed with finest grains in the region with maximum shear strain.

摘要： 通过Gleeble-3500热模拟试验机对403Nb马氏体钢(%:0.16C、11.98Cr、0.03Mo、0.22Nb、0.01V、0.12Ni)在950～1 150℃进行应变速率0.01～10 s^-1,道次间隔1～100 s的二道次热压缩试验。通过总结已发表的各种静态再结晶数学模型,得出403Nb钢静态再结晶激活能Q_rex为168.40 kJ/mol及静态再结晶模型t_0.5=6.599 9×10^-10ε^-1.6ε^-0.46 d₀ exp(168400/RT)。结果表明,热压缩道次间隔时间短,钢的晶粒粗大,静态再结晶率低;道次间隔时间长,静态再结晶接近完成,大部分为等轴晶粒;在热压缩过程中,剪应变最大的区域再结晶最完全,晶粒最细小。

关键词: 403Nb叶片钢, 热压缩, 静态再结晶