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中文摘要：
基于DEFORM-3D有限元平台建立了TA15钛合金大型复杂整体构件预锻成形过程的有限元模型，研究了成形参数对预锻成形过程中变形体组织演化和等轴α相晶粒尺寸的影响规律。结果表明：随着变形的进行，等轴α相晶粒发生细化；在950-980℃范围内变形时，随着变形温度的升高，初生α相晶粒尺寸逐渐增大，在980℃条件下变形时，预锻件整体范围内晶粒尺寸波动较大；随着变形速率的增加，初生α相晶粒尺寸减小；在0．5和1．0mm／s条件下成形时，温度对晶粒尺寸影响比较小，而在0．1mm／s条件下变形时，随着温度的升高，晶粒长大比较严重；随摩擦因子的增大，平均晶粒尺寸有所减小，整个锻件晶粒尺寸分布的不均匀性增加。
英文摘要：
A finite element （FE） model was established to investigate the preforming process of TA15 titanium alloy complex component based on DEFORM-3D platform, and the influence law of forming parameters on the microstructure evolution and the equiaxed a grain size during performing was simulated and analyzed. Results show that the equiaxed α-phases are refined as deformation proceeds. With the increase of temperature, the primary α-phase grain size increases when deformed between 950 ℃ and 980 ℃. The grain size distribution is inhomogeneous when deformed at 980 ℃. With the increasing of the deformation rate, the primary α-phase grain size decreases. Forming at deformation rates of 0.5 and 1.0 mm/s, the effect of temperature on the grain size is small. The primary α-phase grain size increases more rapidly with the increase of temperature at the deformation rate of 0.1 mm/s. The average grain size of α-phase decreases with the increase of the friction factor, and the inhomogeneity of grain size distribution increases.
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