AF1410高强度钢热变形行为研究

Hot deformation behavior of AF1410 high strength steel

利用Gleeble-3800热模拟试验机,在温度850℃~1150℃及应变速率0.001s^(-1)~10s^(-1)下进行热压缩试验,研究了AF1410高强钢的热变形行为。考虑摩擦、温度升高的影响,修正了AF1410钢的实测流变应力,修正后的流变应力低于对应的测量值。随着应变速率增加及变形温度降低,摩擦对流变应力的影响逐渐增大;温度升高对流变应力的影响在高应变、低变形温度时较为明显。基于修正后的流变曲线,通过线性回归确定了变形过程中的热激活能Q=366.89kJ·mol^(-1),建立了AF1410钢的本构方程。

The hot compression deformation behaviors of AF1410 high strength steel were studied over a range of temperatures（850℃-1 150℃）and strain rates（0.001s^-1-10s^-1）on Gleeble-3800thermo-simulation machine.The experiment flow stress of AF1410 steel was corrected considering the influence of the friction and temperature increase.The corrected flow stress is lower than the experimental stress.With the increase of strain rate and decrease of deformation temperature,the effect of friction on the flow stress increases;The influence of temperature on flow stress increases in high strain rate and low deformation temperature.Base on the corrected curve,the activation energy was determined to be Q=366.89kJ·mol-（-1） and the constitutive equation was founded through linear regression.