Q550D超低碳贝氏体钢动态再结晶行为  

Dynamic recrystallization behavior of Q550D ultra-low carbon bainitic steel

作　　者：章威[1] 董洪波[1] 杨新[1] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《材料热处理学报》2012年第12期158-162,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助项目(50964012);新金属材料国家重点实验室开放基金资助项目(2010Z-06)

摘　　要：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 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.

关 键 词：Q550D 动态再结晶 动力学模型 变形激活能 本构方程 

分 类 号：TG142.33[一般工业技术—材料科学与工程]