TC18钛合金变形本构关系及其热轧过程有限元仿真的应用Constitutive relationship and its application in finite element simulation of hot rolling of TC18 titanium alloy

基于热模拟试验，构建TC18合金的Arrhenius型材料本构关系，并将其应用于TC18板坯多道次轧制工艺的有限元仿真，获得各道次轧制过程中的轧件温度场、等效应力-应变场、损伤场等分布情况以及载荷-轧制时间状态，进而为轧件尺寸预测以及轧机规格的选取提供指导。轧件每道次仿真所得尺寸与具体试验所得尺寸比较可知，宽展误差不超过0.7%，长度误差不超过4%。经四道次热轧试验后，在轧件边缘1 mm区域出现了裂纹，与仿真所得损伤场分布一致。上述验证表明仿真结果能够与热轧试验较好吻合。

Based on thermal simulation a Arrhenius type constitutive relationship of TC18 titanium alloy was applied to the finite element simulation of multi-lane hot rolling. The field of temperature, stress-strain and damage and the load-time status at every lane were investigated to predict the rolling size and the specification of rolling mill. The error in spreading width and rolling length between simulating and experimental results are less than 0.7% and 4% at each lane, respectively. Crack occurs at 1 mm edge of the workpiece after four-lane hot rolling experiment, which is in accordance with the damage field obtained from simulation. The above verification shows that the simulation are coincident with the experimental results.

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