采用Gleeble-3500热模拟试验机对Q550D超低碳贝氏体钢进行等温压缩变形试验，研究了该合金在变形温度为1000～1150℃、应变速率为0．01～0．1s。条件下的流变行为。通过应力-应变曲线研究了Q550D钢的动态再结晶规律，并采用硬化率一应变（θ-ε）曲线较精确地确定了动态再结晶的临界条件和峰值应力应变。利用Avrami方程和应力应变曲线建立Q550D钢动态再结晶动力学模型。并通过线性回归分析计算出Q550D超低碳贝氏体钢变形激活能Q，获得了Q550D超低碳贝氏体钢高温条件下的流变应力本构方程。
The flow behavior of Q550D ultra-tow carbon bainitic steel was studied by isothermal compression of cylindrical specimens at 1000 - 1150 ℃ and strain rate of 0. 01 -0. 1 s^-1 on a Gleeble-3500 thermo-simulation machine. The critical conditions for DRX and peak stress/strain were determined by the relationship between work hardening rate (0) and flow strain (8). Mathematical model of the DRX kinetics was developed for low-carbon Q550D steel by using Avrami equation and stress-strain curves. The deformation activation energy Q was evaluated by linear regression analysis, and the flow stress constitutive equation of Q550D ultra-tow carbon hainitie steel during hot compression was obtained.
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