在Gleeble--3500热力学模拟实验机上对Q235A钢试样进行单道次和双道次热压缩实验, 获得流变应力曲线. 把静态再结晶体积分数看作是时间的函数, 将其与热变形结束后位错密度的变化联系起来. 通过 对热压缩实验获得的流变应力曲线的逆分析, 提出了确定静态再结晶动力学模型的新方法. 它可以取代 传统的通过对淬火微观组织金相分析来估算静态再结晶动力学的方法. 运用此方法于普碳钢的热压缩实验中, 在一定的形变量范围内获得了静态再结晶动力学方程. 与已有的模型作比较, 本文提出的方法仅 需少量实验和计算即可获得准确的静态再结晶动力学模型.
The flow curves are obtained using single-hit and double-hit hot compression tests carried out on Gleeble-3500 thermomechanical simulator. The change of dislocation density during inter-pass is related to the static recrystallization volume fraction, which can be seen as a function of time. Based on the inverse analysis of the flow curves, a new method to estimate the kinetics for static recrystallization is proposed. Conventional approach using image analyses of quenched microstructure to evaluate the kinetics for static recrystallization can be replaced from this method. The proposed method is applied to the hot compression tests of plain carbon steel, and the kinetics for static recrystallization are obtained successfully for some range of deformation at elevated temperature. The results are clarified by comparing them with that reported in the literature. It is confirmed that the proposed method could provide accurate kinetics for static recrystallization with shorter time for experiment and computation.
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