X46级管线钢热连轧过程中温度场及平均流变应力的预测

Prediction of Temperature Field and Mean Flow Stress during Hot Strip Rolling of X46 Pipeline Steel

采用有限元计算模型和实测轧件温度以及精轧各道次的轧制压力值,对不同边界条件下的传热系数和塑性功转热率进行了优化计算,得到了轧件断面温度场。在此基础上考虑了再结晶等因素,建立了计算精轧过程中应力 应变曲线的流变应力模型,并利用该模型对X46级管线钢精轧各道次的流变应力进行了预测。结果表明:该模型的计算结果与用Sims法计算的结果吻合较好,能真实反映工业生产的实际情况。

The optimum calculations of the heat transfer coefficient under various boundary conditions and the conversion efficiency from plastic work to heat were carried out based on FEM model, measured temperatures and rolling forces, and the temperature field of work piece was obtained. Considering the recrystallization, the multipass stress strain curve and mean flow stress were predicted during finish rolling of X46 pipeline steel. The measured values agree with the predicted values.