Abstract: The 50% hot deformation test on pipeline steel X52 (L360) ( % ： 0. 08 C, 0. 20Si, 0. 93 Mn, 0. 024Als, 0. 02Nb, 0. 02Ti) with strain rate 0. 01 ~ 10 s^-1 at 950 ~ 1 200 °C was carried out by Gleeble-3500 thermal simulator to get true stress-strain curves. Based on regression analysis, the activation energy and equation of hot deformation of steel X52 is defined and the effects of strain rate, temperature and Z parameter on peak stress of hot deformation are obtained. Results show that with decreasing the defbimation temperature, the peak stress increases and moves in the direction of strain increment, and with increasing the strain rate, the peak stress increases and also moves in the direction of strain increment ； the activation energy of hot deformation of steel X52 is 232 kJ/mol; and with increasing Z parameter T the peak stress of hot deformation increases.

Key words: Pipeline Steel X52, Hot Deformation Behavior, Activation Energy, Z Parameter

摘要： 用Gleeble-3500热模拟试验机对X52(L360)管线钢(%:0.08C、0.20Si、0.93Mn、0.024Als、0.02Nb、0.02Ti)在950～1200℃、应变速率0.01～10 s^-1时进行50%热压缩变形试验,得出真应力-应变曲线。通过回归分析,确定X52钢热变形激活能和热变形方程,得出应变速率、温度和Z参数对热形变峰值应力的影响。结果表明,变形温度降低,峰值应力增加并向应变增大方向移动,随变形速率增加,峰值应力增大并且也向应变增大方向移动;X52钢热变形激活能为232 kJ/mol;随Z参数增加,热变形峰值应力增加。

关键词: X52管线钢, 热变形行为, 激活能, Z参数