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用Gleeble-3500型热模拟试验机对TC4钛合金在变形温度750～950℃、应变速率0.1～50 s-1、最大变形量为50%条件下进行高温变形试验,进而分析了变形参数对变形抗力的影响。结果表明,高温压缩时,TC4钛合金的真应力-真应变曲线呈现出明显的动态再结晶特征;变形抗力受变形温度和应变速率的影响显著,受应变的影响较小,随变形温度的升高、应变速率的减小,变形抗力显著降低。最后提出了一种新型TC4钛合金高温变形的变形抗力模型,该模型拟合精度较好,计算值和实验数据的平均相对误差为5.25%,可以为热轧提供可靠的计算数据。
The hot deformation test of TC4 titanium alloy under the conditions of deformation temperature of 750 ~ 950 ℃, strain rate of 0.1 ~ 50 s-1 and maximum deformation of 50% was carried out by Gleeble-3500 thermal simulation tester. Impact of resistance. The results show that the true stress-true strain curves of TC4 titanium alloy show obvious dynamic recrystallization characteristics under high temperature compression. The deformation resistance is significantly affected by the deformation temperature and strain rate, and is less affected by the strain. With the increase of deformation temperature High, the strain rate decreases, the deformation resistance is significantly reduced. Finally, a new type of deformation resistance model of high temperature deformation of TC4 titanium alloy is proposed. The fitting accuracy of the model is good. The average relative error between calculated value and experimental data is 5.25%, which can provide reliable calculation data for hot rolling.