TA15钛合金不等厚L型材热轧有限元模拟

Finite Element Simulation of Hot Rolling Process for TA15 Titanium Alloy L Profile with Unequal Thickness

利用有限元分析软件Deform-3D建立TA15钛合金不等厚L型材的轧制模型,研究各道次轧件温度场、应变场、金属流动速度的变化规律。模拟结果表明,轧制过程中产生的大量变形热会导致轧件温度升高,且K1~K3道次薄壁侧温度明显高于厚壁侧。在K6和K7道次轧制时,轧件温度过低,需回炉补温。轧件的应变随轧制道次的增加而增加,薄壁侧应变大于厚壁侧。轧件各部位温度及变形量的变化会影响轧件金属流动速度,在K1道次轧制时,厚壁侧与薄壁侧的流动速度差较大,导致轧件产生弯曲变形。采用楔形坯料可有效避免轧件出现变形弯曲。

The hot rolling process of TA15 titanium alloy L profile with unequal thickness was simulated using finite element analysis software Deform-3 D.The temperature field,strain field and metal flow velocity of TA15 titanium alloy after each pass were investigated.The results show that the temperature of rolled pieces increases by the large amount of deformation heat generated during rolling process,and the temperature of the thin-wall side is higher than that of the thick-wall side during K1~K3 pass.During the K6 and K7 pass,the temperature of rolled piece is too low,and it needs to be reheated.Furthermore,the equivalent strain of the rolled piece increases with the increased passes.And the equivalent strain of the thin-wall side is larger than that of the thick-wall side.The metal flow velocity of the rolled piece is affected by the temperature and deformation extent.At K1 pass,the flow velocity difference between the thick-wall side and the thin-wall side is bigger,which could result in bending of the rolled piece.And this problem can be effectively solved with a wedge blank.