论文部分内容阅读
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0.01～0.1 s-1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-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 isothermal compressive deformation test of Q550D ultra-low carbon bainitic steel was carried out on a Gleeble-3500 thermal simulation machine. The rheological behavior of the alloy at deformation temperature of 1000-1150 ℃ and strain rate of 0.01-0.1 s-1 behavior. The dynamic recrystallization rules of Q550D steel were studied by means of stress-strain curve. The critical condition and peak stress-strain of dynamic recrystallization were determined more accurately by using the strain-rate (θ-ε) curve. Dynamic recrystallization kinetics model of Q550D steel was established by Avrami equation and stress - strain curve. The deformation activation energy Q of Q550D ultra-low carbon bainitic steel was calculated by linear regression analysis, and the rheological stress constitutive equation of Q550D ultra-low carbon bainitic steel was obtained under high temperature.